https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt en-us 2021-08-05 09:50:41 UTC 2024-06-03 08:02:13 UTC hello@padlet.com https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669881047 From t=0s to t=18s, the rocket experiences constant acceleration from 0m/s to 64m/s. From t=18s to t=50s, the rocket experiences constant decreasing velocity from 64m/s to 0m/s. At 50m, the rocket is instanteously at rest with downward acceleration 👍

From t = 18 s to t = 50 s, the velocity of the rocket continues to be in the upwards positive direction however the rocket is experiencing an acceleration in the opposite direction (downwards) causing the rocket to decelerate constantly.]]> 2021-08-05 10:06:03 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669881047 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669881853 2m/s^2 ❌ -2m/s^2 ]]> 2021-08-05 10:07:18 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669881853 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669884643 curve upwards from 0s to 20s where max displacement is 576m. the curve showing decreasing displacement where the displacement covered was 1024m. Total displacement is 1600m  👍👍]]> 2021-08-05 10:13:19 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669884643 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669886985 From t=0 to t=18, the rocket had a constant acceleration and has constant increasing velocity from 0m/s to 64m/s. from t=18 to t=50, the rocket has a constant decreasing velocity from 64m/s to 0m/s and has a constant negative acceleration, constant deceleration. 👍

At t = 50s, the instantaneous velocity of the rocket is 0
m/s with an acceleration in the downward direction]]> 2021-08-05 10:18:15 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669886985 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669888304 2m/s^2 ❌ -2m/s^2 

1c)
displacement= 1600m]]> 2021-08-05 10:20:34 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669888304 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669890627 positively charged. ❌ The upper plate is positively charged (connected to positive terminal of battery) hence, the oil droplet must be negatively charged so that it is "pulled" towards the upper plate to cancel out the downward pull of gravity.
2b) plate on top is positive, plate below is negative
field lines from top plate to bottom plate. ✔


2c)The force of attraction and repulsion is the same hence the oil remains suspended. ❌ The vector sum of the forces of attraction by the upper plate and repulsion by the lower plate upwards cancels out the downward pull of the oil droplet due to gravity (i.e. weight). Resultant force is 0 N

]]> 2021-08-05 10:26:17 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669890627 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669893011 From t=0s to t=18s, the rocket has constant positive acceleration from 0m/s to 64m/s. From t=18s to t=50s, the rocket has constant deceleration from 64m/s to 0m/s. At t=50s, the rocket is instantaneously at rest👍  with an acceleration in the downward direction ]]> 2021-08-05 10:32:12 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669893011 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669894163 negatively charged ✔ The upper plate is positively charged (connected to positive terminal of battery) hence, the oil droplet must be negatively charged so that it is "pulled" towards the upper plate to cancel out the downward pull of gravity.]]> 2021-08-05 10:34:51 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669894163 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669894598 2m/s^2 ❌ -2m/s^2 ]]> 2021-08-05 10:35:35 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669894598 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669895335 plate above: positive
plate below: negative
field lines from top to bottom, uniform and parallel in the center, curvatures at the sides ✔]]> 2021-08-05 10:36:03 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669895335 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896012 energy possessed by an object due to its motion. and proportional to the square of its velocity


energy possessed by an object due to its position or vertical distance from the ground (reference point). ✔]]> 2021-08-05 10:37:49 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896012 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896136 The attractive forces and repulsive forces from both plates are equal to the weight of the oil droplet. Hence, resultant force is 0N and the oil remains at rest 👌]]> 2021-08-05 10:38:08 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896136 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896139 Negatively charged ✔]]> 2021-08-05 10:38:09 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896139 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896701 1350J 👌]]> 2021-08-05 10:39:26 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896701 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896854 kinetic energy is the energy an object possesses due to its motion and proportional to the square of its velocity

GPE is the energy that an object possesses due to its position (height)  relative to the ground ✔]]> 2021-08-05 10:39:51 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669896854 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669897076 1350J 👌]]> 2021-08-05 10:40:26 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669897076 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669897212 450W 👌]]> 2021-08-05 10:40:43 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669897212 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669897227 450W 👌]]> 2021-08-05 10:40:45 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669897227 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669897763 Some energy from the pulley is lost due to friction in the pulley system. Hence the total amount of energy comprises of both the work done to lift the bricks and to overcome friction 👌 ]]> 2021-08-05 10:42:07 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669897763 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669898632 The sum of attractive force by the upper plate and repulsive force by the lower plate acting on the oil droplet are equal to its weight pulled downwards by gravity. Thus, there is no resultant force and the oil remains stationary ✔]]> 2021-08-05 10:44:16 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669898632 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669898758 The principle of conservation of energy states that energy cannot be created or destroyed but can be converted from one form to another and in a closed system, the total amount of energy always remains constant. In a real life situation, not all energy is used for lifting the weight, some energy is converted to other forms of energy such as thermal energy and energy to overcome friction (at the pulley) . Hence in real life situation, the work done in lifting the bricks is higher than the value calculated in part (b). 👌 ]]> 2021-08-05 10:44:35 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669898758 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669900171 Kinetic energy: Energy a body possesses due to its motion and proportional to the square of its velocity

Gravitational potential energy: Energy which an object possesses because of its position relative to the ground (reference point) ]]> 2021-08-05 10:46:57 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669900171 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669900172 When force F is applied, the air in the container is compressed, which causes some air molecule to exert a force on the left side of the manometer. Since pressure is defined as a force per unit area, air molecules exert a higher pressure on the water on the left side of the manometer which causes pushes on the water level to drop ]]> 2021-08-05 10:46:57 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669900172 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669900502 1a. From t=0s-t=18s, the rocket has a constant acceleration from 0m/s-64m/s. When t=18s-t=50s, the rocket has a constant decreasing acceleration and a constant decreasing velocity from 64m/s-0m/s. 👍 At t=50s, the rocket is instantaneously at rest with an acceleration in the downward direction

b. 2m/s^2 ❌ -2m/s^2 ]]> 2021-08-05 10:47:45 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669900502 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669900696 1350J 👌]]> 2021-08-05 10:48:10 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669900696 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669901079 450W 👌]]> 2021-08-05 10:48:50 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669901079 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669901818 106000Pa ❌ 6000 Pa]]> 2021-08-05 10:50:30 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669901818 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669902225 10600N ❌ 600N]]> 2021-08-05 10:51:14 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669902225 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669902490 Use a liquid of higher density  👍👍]]> 2021-08-05 10:51:54 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669902490 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669902642 longitudnal waves ✔]]> 2021-08-05 10:52:13 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669902642 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903037 660 complete wavelengths are created by the source in 1 second  ✔]]> 2021-08-05 10:52:55 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903037 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903171 0.5m ✔]]> 2021-08-05 10:53:18 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903171 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903271 0.5mm ✔]]> 2021-08-05 10:53:27 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903271 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903631 330m/s ✔]]> 2021-08-05 10:54:00 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903631 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903637 The principal of conservation of energy states that energy cannot be created or destroyed, but only changes from one form to another. In real life, not all the energy was used to lift up the brinks as some of it was converted to other forms of energy like thermal energy to overcome work done against friction. Thus, the work done in lifting the bricks is higher than that calculated in (b)]]> 2021-08-05 10:54:01 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903637 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903699 from t=0 to t=18 the rocket accelerates constantly from 0m/s to 64m/s. At t=18s, the rocket's velocity then decreases constantly from 64m/s to 0 m/s from t=18 to t=50, and becomes instantaneously at rest at t=50s 👍 with an
acceleration in the downward direction]]> 2021-08-05 10:54:03 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903699 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903983 Image is formed on the same side of the lens as the object ✔]]> 2021-08-05 10:54:43 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669903983 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669904035 2m/s ² ❌ -2m/s^2 ]]> 2021-08-05 10:54:50 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669904035 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669904985 When force F is applied on the plastic container, the container becomes compressed and some of the air in the container is forced into the manometer and pushes on the surface of the liquid.  Thus the air exerts pressure on the water and causes the water level on the left side to decrease ✔]]> 2021-08-05 10:56:49 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669904985 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669905054 1. virtual to real ✔
2. upright to inverted✔]]> 2021-08-05 10:56:59 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669905054 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669905747 angle of incidence: 45 degrees ✔
angle of refraction: 28 degrees ✔]]> 2021-08-05 10:58:47 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669905747 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669905814 2a. Positively charged ❌ The upper plate is positively charged (connected to positive terminal of battery) hence, the oil droplet must be negatively charged so that it is "pulled" towards the upper plate to cancel out the downward pull of gravity.

b. Top plate: positively charged
     Bottom plate: negatively charged
field lines move from top plate to bottom plate

c. The sum of forces of attraction (by the upper plate) and repulsion (from the bottom plate) are equal to the weight of the oil droplet on both the top and bottom plate respectively, so there is no resultant force and the droplet remains stationary ✔]]> 2021-08-05 10:58:54 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669905814 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669906162 positively charged ❌ The upper plate is positively charged (connected to positive terminal of battery) hence, the oil droplet must be negatively charged so that it is "pulled" towards the upper plate to cancel out the downward pull of gravity.]]> 2021-08-05 10:59:12 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669906162 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669906620 the oil remains suspended because the weight is equal to the vector sum of force of repulsion from the negative bottom place and attraction from the positive upper plate and there is no resultant force ✔]]> 2021-08-05 11:00:06 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669906620 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669907965 when the force F is applied, air in the container is compressed. this causes air to molecules to exert a force on the manometer. pressure is the force per unit area hence the greater the force , the greater the pressure which causes water level on the left side of the manometer to drop. 👍👍]]> 2021-08-05 11:03:30 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669907965 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669909350 energy an object possesses due to its motion and proportional to the square of its velocity

energy an object possesses due to its height above the ground (reference point)

1350 J 👌
450 W 👌

by the principle of the conversation of energy, energy cannot be destroyed as it is only converted to other forms of energy. the work done in lifting the bricks is higher than 1350 w as some of the energy is converted to heat and sound 👌 due to work done against friction at the pulley]]> 2021-08-05 11:06:02 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669909350 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669912315 3a. Kinetic energy is the energy that a body possesses when it is in motion and proportional to the square of its velocity


Gravitational potential energy is the energy stored in an object, as a result of its vertical position or height from ground level (reference point)  ✔

b. 1350J 👌

c. 450W 👌

d. By the principle of conservation of energy, energy can neither be created nor destroyed, but it can be converted from one form to another in a system. In real life, the energy used to lift the brick is not 100% as some of the energy is converted to other forms of energy such as heat and sound due to work done against friction. Therefore, the work done in lifting the bricks is much higher than 1350J in real life 👌]]> 2021-08-05 11:11:30 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669912315 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669912818 106000Pa ❌ 6000 Pa]]> 2021-08-05 11:12:35 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669912818 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669913021 The angle of refraction is larger for red light. This is because refractive index for red light has a lower refractive index so it bends less towards the normal thus forming a larger angle of refraction  👍]]> 2021-08-05 11:13:02 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669913021 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669913151 10600N ❌ 600N]]> 2021-08-05 11:13:22 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669913151 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669913999 Use a denser liquid 👍👍]]> 2021-08-05 11:14:52 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669913999 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669914463 Longitudinal waves ✔]]> 2021-08-05 11:15:17 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669914463 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669915060 The number of complete waves generated per second is 660 ✔]]> 2021-08-05 11:16:36 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669915060 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669916097 0.5m ✔]]> 2021-08-05 11:18:13 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669916097 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669916411 0.5mm ✔]]> 2021-08-05 11:18:58 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669916411 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669916705 330m/s ✔]]> 2021-08-05 11:19:37 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669916705 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669917951 1. The positively charged rod is brought close, but not touching the sphere. 
2. connect the connection to earth
3. Remove the connection after a while 
4. Remove the positively charged rod
the sphere is now negatively charged 👍👍]]> 2021-08-05 11:21:44 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669917951 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669918403 The image formed is on the same side of the lens as the object ✔]]> 2021-08-05 11:22:32 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669918403 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669918882 1. Image turns from virtual to real ✔
2. Image turns from upright to inverted ✔]]> 2021-08-05 11:23:02 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669918882 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669919389 106000Pa ❌ 6000 Pa]]> 2021-08-05 11:23:55 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669919389 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669919538 10600N ❌ 600N]]> 2021-08-05 11:24:12 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669919538 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669919706 incidence: 45 degrees ✔
refraction: 28 degrees ✔]]> 2021-08-05 11:24:36 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669919706 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669919784 use a liquid with a higher density 👍👍]]> 2021-08-05 11:24:48 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669919784 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669920306 longitudinal waves.  ✔]]> 2021-08-05 11:25:38 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669920306 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669920661 there are 660 complete wavelength created in a second ✔]]> 2021-08-05 11:26:27 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669920661 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669921135 The angle of refraction at point A for red light is larger than that of blue light. Since red light has a smaller refractive index that blue light, it bends less towards the normal and forms a larger angle of refraction 👍]]> 2021-08-05 11:27:20 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669921135 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669921863 Firstly, when the positively charged rod is brought near the sphere, there is an excess of will be electrons on the left side of the sphere and positive charges and a shortage of electrons on the right side. When the connection from earth is connected, electrons are attracted from earth to the sphere to neutralise the positive charges in the sphere. When the connection is disconnected and when the positively charged rod is removed, the excess electrons in the sphere repel each other and spread out evenly throughout the sphere. (* please note phrasing)]]> 2021-08-05 11:28:23 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669921863 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669922287 4a. When force is applied to the plastic container, the air molecules in the container are compressed. This causes the air molecules to collide with the left side of the manometer more frequently exerting a force on it. As pressure is force per unit area, as the pressure of the manometer on the left increases as air exerts a pressure on it, the water level drops on the left side of the manometer  👍👍

b. 106000 Pa ❌ 6000 Pa

c. 10600N ❌ 600N

d. By using a liquid that is denser 👍👍]]> 2021-08-05 11:29:21 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669922287 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669922652 4.8x10^-10A 👌👌]]> 2021-08-05 11:30:11 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1669922652 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671676816 When the force F is applied, the air is compressed, exerting a force on the water on the left side of the manometer. As the pressure on the water on the left side of the manometer is greater than the pressure on the water on the right side of the manometer. The water level then moves downwards on the left side. 👍👍

6000 PA ✔
600 N ✔
Increase the density of the liquid used 👍👍]]> 2021-08-07 13:20:59 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671676816 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671682920 longitudinal ✔
there are 660 waves produced in a second ✔
0.5 m
0.5 mm
330 m/s  ✔]]> 2021-08-07 13:38:49 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671682920 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671684416 they do not converge ❌ The real light rays do not converge after leaving the lens on the other side.

the image becomes inverted and real ✔]]> 2021-08-07 13:43:33 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671684416 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671686246 45 degrees ✔
28 degrees ✔
the angle of refraction for red light is larger than that of blue light ✔ Reason: Refractive index of red light is smaller so it bends less towards the normal compared to blue light. Hence, the angle of refraction for red light is bigger than blue light. ]]> 2021-08-07 13:48:29 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671686246 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671688863 Move the rod near to the sphere and connect the sphere to earth. Disconnect the sphere from earth. Move the rod away. 👍👍


When the positive rod is brought near the metal sphere, negative charges will be attracted to the left side of the sphere and the positive charges will be repelled to the other side of the sphere. As unlike charges attract, negative charges in the earth will move up the wire into the sphere towards the positively charged rod and neutralise the positive charges. There will then be more negative charges than positive charges in the sphere, causing the sphere to be negatively charged.

4.8x10^-10 A 👌👌]]> 2021-08-07 13:55:19 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671688863 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671696232 the energy required to raise the temperature of 1kg of the material by 1 degree celcius 👍

47000 J  👍

Where is 9b(ii) min mass of milk?

as the time increases, the temperature of the heated milk decreases  👍

the molecules of milk with the highest temperature and as such the highest kinetic energy will vibrate the fastest, thus leaving the liquid through evaporation the fastest. as these molecules with the highest temperature leave the remaining liquid experiences a drop in the total kinetic energy and thus temperature of the liquid  decreases 👍

convection occurs above the surface of the milk  due to the warm milk becoming less dense and the cool milk becoming denser. ✔

conduction occurs between the glass of milk and the table top, ✔

radiation occurs when heat is radiated via Infra-red rays from the side of the cup ]]> 2021-08-07 14:16:27 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671696232 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671701095 south pole
as the magnetic field produced by the solenoids is perpendicular to the current flowing through the wire, an upward force is exerted on wire ab and a downward force is exerted on wire cd, allowing the coil to move in a clockwise manner
2.0 N
It is a slip-ring conductor that reverses the direction of the current flow every half a turn so that the forces can continue to act in the same direction]]> 2021-08-07 14:30:04 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671701095 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671703725 As the temperature increases, the resistance of the thermistor decreases at a decreasing rate.
95 ohm
0.138 A
13.1 V
13 C
a higher temperature will be needed to activate the alarm]]> 2021-08-07 14:37:38 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671703725 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671705015 10 N
2000 N
0.25 cm
The force of the load on Q and the load of the force on Q
they have the same magnitude
they have opposite directions]]> 2021-08-07 14:41:52 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1671705015 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676638614 specific heat capacity is the themal energy required to raise the temperature of 1kg of a substance by 1⁰C or 1K  👍]]> 2021-08-12 09:38:04 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676638614 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676639162 0.5m ✔]]> 2021-08-12 09:39:13 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676639162 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676639423 0.5mm ✔]]> 2021-08-12 09:39:40 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676639423 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676639592 330m/s ✔]]> 2021-08-12 09:39:58 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676639592 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676640068 image is formed on the same side of the lens as the object. ✔]]> 2021-08-12 09:40:51 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676640068 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676640069 Bring the positively charged rod close to the metal sphere and connect it to the earth
After a while, remove the connection first and then remove the positively charged rod, the metal sphere will then be negatively charged]]> 2021-08-12 09:40:51 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676640069 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676640960 1.The image changes to real from virtual ✔


2.The image changes to inverted from upright. ✔]]> 2021-08-12 09:42:48 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676640960 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676641526 When the positively charged rod is brought close to the sphere, the negative charges in the sphere will be attracted to it. When it is connected to the earth, electrons from the earth move into the sphere. Once  NEXT, the earth wire it is disconnected and the positively charged rod is removed, the negative charges will spread out evenly in the sphere. ✔]]> 2021-08-12 09:43:53 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676641526 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676642632 5a. Longitudinal waves ✔

b. The number of complete waves produced in 1 second is 660 ✔

ci. 0.5m ✔

ii. 0.5mm ✔

d. 330m/s ✔]]> 2021-08-12 09:46:02 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676642632 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676642829 4.8x10^-10 A 👍👍]]> 2021-08-12 09:46:25 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676642829 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676643272 47000J 👍]]> 2021-08-12 09:47:18 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676643272 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676645888 angle I:45 degrees ✔
angle r:28 degrees ✔]]> 2021-08-12 09:52:07 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676645888 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676647001 Specific heat capacity is the thermal energy required to raise the temperature of a unit mass of a substance by 1K or 1 degree celsius 👍 ]]> 2021-08-12 09:54:39 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676647001 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676647596 The angle of refraction is larger for the red light as compared to the blue light as the red light has a lower refractive index and bends less towards the normal. Hence it will form a larger angle of refraction. 👍]]> 2021-08-12 09:56:03 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676647596 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676648561 6b. The image is formed on the same plane side of the lens as the object

c. The image changes from virtual to real ✔
    The image changes from being upright to inverted ✔]]> 2021-08-12 09:57:39 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676648561 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676649631 7a. angle of incidence: 45 degrees ✔
      angle of refraction: 28 degrees ✔

b. The angle of refraction is larger for red light than blue light due to the difference in refractive index for both red and blue light with the refractive index of red light being lower than the refractive index for blue light.  👍This results in the refracted ray (of blue light ) bending more away from towards the normal so the angle of refraction is greater

]]> 2021-08-12 09:59:22 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676649631 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676651084 1600 m]]> 2021-08-12 10:02:32 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676651084 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676652626 firstly, bring the positively charged rod close to the metal sphere and ensure that the charged rod does not touch the sphere. Next, connect the connection to earth to the metal sphere. Then remove the connection to the earth after some. Remove the positively charged rod, leaving the sphere to be negatively charged. 👍]]> 2021-08-12 10:04:57 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676652626 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676653201 47000J]]> 2021-08-12 10:06:16 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676653201 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676654902 when the positively charged rod is brought close to the metal sphere, unlike poles charges attract, the negative charges in the sphere are attracted to the positively charged rod and the positive charges will be repelled to other side of the metal sphere. when the connection to earth is connected to the sphere, electrons will flow up to neutralize the positive charges in the sphere leaving only the excess of negative charges. As the positively charged rod is removed, the negative charges are no longer attracted and will spread evenly throughout the sphere. ]]> 2021-08-12 10:09:05 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676654902 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676655235 4.8(10^-10) A 👌👌]]> 2021-08-12 10:09:53 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676655235 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676655941 0.0189kg  👍]]> 2021-08-12 10:11:25 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676655941 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676656214 It is the amount of energy required to raise the temperature of 1kg of a substance by 1 degree celsius. 👍]]> 2021-08-12 10:12:01 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676656214 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676657778 0.0208kg ❌]]> 2021-08-12 10:14:04 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676657778 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676657837 8a. Bring the positively charged rod near to but not touching the sphere. Then connect the earth wire to the other side of the sphere creating a path for earthing. Afterwards, remove the earth wire after some time but leave the positively charged rod near to the sphere. Now, remove the positively charged rod. This leaves the sphere to be negatively charged and the charges would redistribute themselves on the surface of the sphere. 👍👍

b. When the positively charged rod is brought near the sphere, as unlike charges attract, the electrons would be attracted to the left side of the sphere, leaving the right side positively charged. When a path for earthing is created, the electrons from the earth would flow up the earth wire to neutralise the positive charges as unlike charges attract. Once the earth wire is removed, the excess charges left in the metal sphere would be negative charges which are held in a fixed position by the rod. Once the rod is removed, the negative charges would redistribute themselves on the surface of the sphere. ✔

c. 4.8x10^-10 A 👌👌]]> 2021-08-12 10:14:11 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676657837 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676657845 47000J  👍]]> 2021-08-12 10:14:12 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676657845 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676659867 As time increases, the temperature of the heated milk decreases  👍]]> 2021-08-12 10:17:48 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676659867 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676661989 As time increases, the temperature of heated milk decreases 👍]]> 2021-08-12 10:21:19 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676661989 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676662488 Evaporation occurs when the faster-moving molecules escape from the attraction of their neighbours and leave the surface of the milk, leaving behind the slower-moving molecules. Thus the average speed and the average kinetic energy of the remaining molecules in the milk decreases. As a result, the temperature of the heated milk decreases 👍👍👍]]> 2021-08-12 10:22:21 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676662488 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676663211 During evaporation, more energetic water molecules are able to overcome the intermolecular forces of attraction between molecules and the atmospheric pressure first. This leaves less energetic water molecules in the milk. Since temperature is dependent on the kinetic energy, with a drop in the average kinetic energy of particles, the temperature of the the milk decreases. 👍👍👍]]> 2021-08-12 10:23:56 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676663211 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676664165 0.0208kg ❌ 0.0189 kg]]> 2021-08-12 10:25:58 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676664165 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676664359 There is a transfer of thermal energy by conduction from the milk to the surroundings and from the cup to the surface. There is thermal energy lost to the surroundings via convection as convection currents are set up above the cup. There is a transfer of thermal energy by radiation conduction from the sides of the cup to the surroundings ✔]]> 2021-08-12 10:26:25 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676664359 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676664667 South]]> 2021-08-12 10:27:03 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676664667 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676665544 A to B to C to D]]> 2021-08-12 10:28:55 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676665544 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676665617 As time increases, the temperature of heated milk decreases.  👍]]> 2021-08-12 10:29:07 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676665617 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676666018 Thermal energy is transferred from the surface of the milk to the surroundings (table top) via conduction.

It is also transferred via convection as there is a convection current above the glass. (air in contact with the hot milk surface becomes less dense due to expansion and the cold air sinks and creates convection current)

Thermal energy is also transferred from the sides of  the glass via radiation (in the form of infra-red rays)]]> 2021-08-12 10:29:53 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676666018 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676666901 9a. The specific heat capacity of a substance is the amount of thermal energy required to increase the temperature of 1kg of a substance by 1 degree celsius or 1 kelvin 👍
 
bi. 47000J  👍

ii. 0.0208kg   ❌

ci. As time increases, the temperature of heated milk decreases  👍

ii. Evaporation, which occurs on the surface of the liquid, results in the molecules which have larger amounts of kinetic energy to overcome the attractive forces due to other molecules to escape from the surface and into the atmosphere. This leaves behind the less energetic molecules so the average kinetic energy decreases. As the temperature is dependent on the kinetic energy of the molecules, the temperature decreases as a result.👍👍👍

iii. The milk loses heat via conduction. This is because heat is conducted from the hot milk which is a warmer region via the glass walls of the cup to the table top surroundings which are cooler regions. Furthermore, heat is also lost to the surrounding via convection as the hot milk air above the milk surface which is less dense would rise and the cooler milk air will sink to fill up the space that was previously taken by the hot air milk. This sets up convection currents above the cup

(Note: heat is also lost as infra-red radiation via the sides of the cup) ]]> 2021-08-12 10:31:14 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676666901 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676667496 Using the Fleming's Left Hand Rule, on side AB, the middle finger which represents current points into the paper, the index finger which represents direction of magnetic field points to the left. Thus, the thumb which represents direction of induced force points upwards on AB. For CD, the thumb points downwards so there is a downwards induced force on CD. This creates a clockwise moment thus the coil turns in the clockwise dorection]]> 2021-08-12 10:32:02 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676667496 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676667528 South]]> 2021-08-12 10:32:07 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676667528 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676667807 Evaporation occurs at the surface of the substance. during evaporation, more energetic water molecules are able to overcome the intermolecular forces of attraction between the molecules and the atmospheric pressure, leaving less energetic molecules in the milk. Hence average kinetic energy of particles decreases, leading to a decrease in the temperature of the milk.👍👍👍]]> 2021-08-12 10:32:40 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676667807 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676667993 2.00N]]> 2021-08-12 10:33:05 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676667993 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676669430 Using Fleming's left hand rule, the index finger which represents the direction of the magnetic field points to the left and the middle finger which represents the direction of the current goes into the paper. Therefore, the thumb which represents the force points upwards on AB and downwards on CD.]]> 2021-08-12 10:36:07 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676669430 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676669746 Part E is the split-ring commutator. The split ring commutator reverses the direction of current every 1/2 revolution. The change of direction of current in the coil will enable the coil to continuously be rotating in one single direction as the current in the coil will always flow in a clockwise manner. Hence, a continuous upward force is induced on AB and a continuous downward force is induced on CD, ensuring that the coil continuously turns in the clockwise direction. ]]> 2021-08-12 10:36:50 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676669746 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676670144 conduction. thermal energy in milk is loss to the surroundings against the table top

by conduction radiation through the sides of the glass.

convection. there are convection currents around the glass at the top surface of milk causing a transfer of thermal energy.]]> 2021-08-12 10:37:39 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676670144 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676670531 As temperature increases the thermistor resistance decreases. ]]> 2021-08-12 10:38:18 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676670531 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676670592 2.00N]]> 2021-08-12 10:38:27 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676670592 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676670884 95 ohms]]> 2021-08-12 10:39:06 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676670884 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676671594 Part E is the split ring commutator. It reverses the flow of the current every half rotation so that the forces will continue to rotate in the clockwise direction]]> 2021-08-12 10:40:43 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676671594 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676671625 0.138A ]]> 2021-08-12 10:40:47 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676671625 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676671745 south ]]> 2021-08-12 10:41:00 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676671745 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676671796 13.1V]]> 2021-08-12 10:41:07 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676671796 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676672085 from A-B-C-D]]> 2021-08-12 10:41:46 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676672085 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676672163 As the temperature increases, the resistance of the thermistor decreases at a decreasing rate]]> 2021-08-12 10:41:56 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676672163 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676672392 13 degree C]]> 2021-08-12 10:42:26 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676672392 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676672884 95 ohm]]> 2021-08-12 10:42:50 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676672884 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676673548 The temperature to activate the alarm bell increases]]> 2021-08-12 10:44:00 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676673548 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676674023 0.138A]]> 2021-08-12 10:44:59 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676674023 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676675199 using Fleming's left hand rule. Q is the south pole and R is the north pole. the index finger represents the the direction of magnetic field which is pointed to ward the left. The middle finger is the direction of current. Current on side AB is going into the paper. hence the middle finger is to point into the paper. the thumb which represents the the direction of induced force is pointing upwards. indicating that the side AB has an induced upwards force. For side CD, the direction of current is out of the paper. by pointing the middle finger out of the paper and keeping the index finger in the same direction, the side CD has an induced downward force acting on it.]]> 2021-08-12 10:47:21 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676675199 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676675912 10.0N]]> 2021-08-12 10:48:40 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676675912 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676676213 13.1V]]> 2021-08-12 10:49:16 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676676213 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676676513 2000N]]> 2021-08-12 10:49:55 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676676513 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676676612 0.250cm]]> 2021-08-12 10:50:08 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676676612 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676677283 Force of Q on load
Force of load on Q]]> 2021-08-12 10:51:24 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676677283 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676677596 2.00N]]> 2021-08-12 10:52:03 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676677596 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676677600 identical in magnitude
different in direction]]> 2021-08-12 10:52:03 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676677600 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676679242 13 degrees celsius]]> 2021-08-12 10:54:57 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676679242 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676679567 Part E is the split ring commutator. It reverses the flow of the current every half rotation so there will be a continuous upward force on side AB and a continuous downward force on side CD. the forces will continue to rotate in the clockwise direction.]]> 2021-08-12 10:55:31 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676679567 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676680119 10ai. South pole

ii. From A to B to C to D

iii. By Fleming's Left-Hand Rule, on AB, the index finger which represents the direction of the magnetic field points towards the left while the middle finger which represents the direction of current points from A to B. Hence the thumb which represents the direction of the force-induced points upwards. On CD, the index finger which represents the direction of the magnetic field points towards the left while the middle finger represents the direction of current points from C to D. Hence the thumb which represents the direction of the force-induced points downwards. This results in a clockwise moment being created so the coil rotates clockwise.

bi. 2.00N

ii. Part E is a split-ring commutator that reverses the direction in which the current flows every half a period. This means that the current would flow in a clockwise direction for the first 1/2 a period then it would flow in an anticlockwise direction for the next 1/2 a period and vice versa. This ensures that the force-induced at AB is always upwards while the force induced at CD is always downwards so the coil rotates clockwise continuously]]> 2021-08-12 10:56:34 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676680119 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676680532 A higher temperature will be needed for the alarm to activate]]> 2021-08-12 10:57:18 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676680532 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676681256 As temperature increases, resistance of thermistor decreases ]]> 2021-08-12 10:58:46 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676681256 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676682070 95ohm]]> 2021-08-12 11:00:03 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676682070 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676682078 10N]]> 2021-08-12 11:00:05 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676682078 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676682694 2000N]]> 2021-08-12 11:01:15 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676682694 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676683010 0.138A]]> 2021-08-12 11:01:47 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676683010 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676683899 13.1V]]> 2021-08-12 11:02:58 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676683899 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676684277 13 degrees Celsius]]> 2021-08-12 11:03:46 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676684277 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676684505 0.25cm]]> 2021-08-12 11:04:17 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676684505 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676684783 the alarm bell will require a higher temperature in order to be activated.]]> 2021-08-12 11:04:49 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676684783 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676684959 The force of the load exerted on piston Q and the force of piston Q exerted on the load]]> 2021-08-12 11:05:12 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676684959 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676685814 They have the same magnitude
They act in different directions]]> 2021-08-12 11:06:42 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676685814 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676686897 10.0N]]> 2021-08-12 11:08:44 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676686897 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676689666 a. As the temperature increases, the resistance of the thermistor decreases.

b. 95 ohm

ci. 0.138A

ii. 13.1V

d. 13 degree celcius

e. The temperature at which the alarm bell rings increases


]]> 2021-08-12 11:13:31 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676689666 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676690219 2000N]]> 2021-08-12 11:14:34 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676690219 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676694387 0.250cm]]> 2021-08-12 11:22:00 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676694387 https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676701632 a. 10.0N
b. 200N
c. 0.25cm
d. Force on piston Q by load
    Force on load by piston Q
e. They are of the same magnitude
They are acting in opposite directions]]> 2021-08-12 11:33:42 UTC https://padlet.com/gregorywong_sg/o8cdakz7rp3576qt/wish/1676701632