# data[].attributes.body
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.

# data[].attributes.body
2m/s^2 ❌ -2m/s^2

# data[].attributes.body
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  👍👍

# data[].attributes.body
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

# data[].attributes.body
2m/s^2 ❌ -2m/s^2

1c)
displacement= 1600m

# data[].attributes.body
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

# data[].attributes.body
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

# data[].attributes.body
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.

# data[].attributes.body
2m/s^2 ❌ -2m/s^2

# data[].attributes.body
plate above: positive
plate below: negative
field lines from top to bottom, uniform and parallel in the center, curvatures at the sides ✔

# data[].attributes.body
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). ✔

# data[].attributes.body
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 👌

# data[].attributes.body
Negatively charged ✔

# data[].attributes.body
1350J 👌

# data[].attributes.body
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 ✔

# data[].attributes.body
1350J 👌

# data[].attributes.body
450W 👌

# data[].attributes.body
450W 👌

# data[].attributes.body
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 👌

# data[].attributes.body
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 ✔

# data[].attributes.body
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). 👌

# data[].attributes.body
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)

# data[].attributes.body
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

# data[].attributes.body
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

# data[].attributes.body
1350J 👌

# data[].attributes.body
450W 👌

# data[].attributes.body
106000Pa ❌ 6000 Pa

# data[].attributes.body
10600N ❌ 600N

# data[].attributes.body
Use a liquid of higher density  👍👍

# data[].attributes.body
longitudnal waves ✔

# data[].attributes.body
660 complete wavelengths are created by the source in 1 second  ✔

# data[].attributes.body
0.5m ✔

# data[].attributes.body
0.5mm ✔

# data[].attributes.body
330m/s ✔

# data[].attributes.body
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)

# data[].attributes.body
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

# data[].attributes.body
Image is formed on the same side of the lens as the object ✔

# data[].attributes.body
2m/s 2 ❌ -2m/s^2

# data[].attributes.body
1. virtual to real ✔
2. upright to inverted✔

# data[].attributes.body
angle of incidence: 45 degrees ✔
angle of refraction: 28 degrees ✔

# data[].attributes.body
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 ✔

# data[].attributes.body
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.

# data[].attributes.body
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 ✔

# data[].attributes.body
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 ✔

# data[].attributes.body
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. 👍👍

# data[].attributes.body
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

# data[].attributes.body
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 👌

# data[].attributes.body
106000Pa ❌ 6000 Pa

# data[].attributes.body
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  👍

# data[].attributes.body
10600N ❌ 600N

# data[].attributes.body
Use a denser liquid 👍👍

# data[].attributes.body
Longitudinal waves ✔

# data[].attributes.body
The number of complete waves generated per second is 660 ✔

# data[].attributes.body
0.5m ✔

# data[].attributes.body
0.5mm ✔

# data[].attributes.body
330m/s ✔

# data[].attributes.body
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 👍👍

# data[].attributes.body
The image formed is on the same side of the lens as the object ✔

# data[].attributes.body
1. Image turns from virtual to real ✔
2. Image turns from upright to inverted ✔

# data[].attributes.body
106000Pa ❌ 6000 Pa

# data[].attributes.body
10600N ❌ 600N

# data[].attributes.body
incidence: 45 degrees ✔
refraction: 28 degrees ✔

# data[].attributes.body
use a liquid with a higher density 👍👍

# data[].attributes.body
longitudinal waves.  ✔

# data[].attributes.body
there are 660 complete wavelength created in a second ✔

# data[].attributes.body
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 👍

# data[].attributes.body
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)

# data[].attributes.body
4.8x10⁻¹⁰A 👌👌

# data[].attributes.body
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 👍👍

# data[].attributes.body
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 👍👍

# data[].attributes.body
5a. Longitudinal waves ✔

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

ci. 0.5m ✔

ii. 0.5mm ✔

d. 330m/s ✔

# data[].attributes.body
longitudinal ✔
there are 660 waves produced in a second ✔
0.5 m
0.5 mm
330 m/s  ✔

# data[].attributes.body
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 ✔

# data[].attributes.body
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.

# data[].attributes.body
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 👌👌

# data[].attributes.body
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

# data[].attributes.body
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

# data[].attributes.body
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

# data[].attributes.body
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

# data[].attributes.body
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 ✔

# data[].attributes.body
specific heat capacity is the themal energy required to raise the temperature of 1kg of a substance by 1⁰C or 1K  👍

# data[].attributes.body
0.5m ✔

# data[].attributes.body
0.5mm ✔

# data[].attributes.body
330m/s ✔

# data[].attributes.body
image is formed on the same side of the lens as the object. ✔

# data[].attributes.body
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

# data[].attributes.body
1.The image changes to real from virtual ✔

2.The image changes to inverted from upright. ✔

# data[].attributes.body
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. ✔

# data[].attributes.body
4.8x10^-10 A 👍👍

# data[].attributes.body
47000J 👍

# data[].attributes.body
angle I:45 degrees ✔
angle r:28 degrees ✔

# data[].attributes.body
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 👍

# data[].attributes.body
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. 👍

# data[].attributes.body
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

# data[].attributes.body
1600 m

# data[].attributes.body
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. 👍

# data[].attributes.body
47000J

# data[].attributes.body
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.

# data[].attributes.body
4.8(10^-10) A 👌👌

# data[].attributes.body
0.0189kg  👍