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I only don’t really understand the solution for Q14

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Why is the answer B? As if the focal length equals to the ‘u’, wouldn’t that mean that v is infinity? And how does the image of the object form then?

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the answer said that the steepest line has to be from origin (0,0) and touching the curve to find the point of smallest resistance, but why does it have to be from the origin? Why can’t it just be the point on the curve with the steepest gradient?

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I want to ask about option B… what is the reading on the voltmeter, as in what pd is it measuring? And what is the reading on the ammeter, as in what current is it measuring?

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how do we determine the direction of a thermistor symbol?

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The question asks us to state one possible state of motion if the car at this instant and the answer key gives both “moving at constant velocity” and “at rest” as the answer and that both are necessary as they show understanding of Newton’s first law, does this mean that “moving at constant velocity” and “at rest” are the same state of motion of the car? Thank you Mr Ang!

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how do I know what points the curve will pass through? Like I know it’s a curve but like how do I know it’s position? Like in the ans key the two dots I labelled, like how do I know if it will start there?

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Thank you very much, Mr Ang!

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what does "alternating current" in q29 mean? thank you!

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Why is q4a region B? Isn’t the bending direction of the water waves towards the normal in region B so region B should be the shallow one? thank you!

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Q4 drawing of incident and reflected wave directions

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Q4 drawing of incident and reflected wave directions

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May I know how to solve q13? thank you!

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Hi Mr Ang! May I know why the answer is B for this question? I understand that the distance waves have to travel decreases in shallower water, but wouldn’t the speed of the waves decrease too? Thank you very much!

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Hi Mr Ang! May i know how to solve the following question? Thank you!

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Hi Mr Ang! For q21, I thought that "work done to move a charge through an electrical component in a circuit" is referring to potential difference (according to the definition of potential difference) so the question is asking for the units of potential difference. but why is it that the answer for the question is the units for work done? thank you!

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Hi Mr Ang! May I know why is the answer for q5e "increase the focal length"? when the object is moved further from the eyes, isn't the image closer to the lens so a shorter focal length should be used? thank you!

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here is part e for q5 that I asked in the previous post. Thank you!

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Given that an entire string only has one tension value (T1), is it correct that should there be two points of contact with a portrait, the string is able to exert two (T1) forces at each point but total tension ≠ T1 + T1? Thank you very much!

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phyglossary [licensed for non-commercial use only] / S4_MYE

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If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

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What does an insulating thread do? Does it only prevent the flow of electrons or prevent any attraction or repulsion?

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Hi Mr ang, for this question part b, when calculating acceleration, the time is calculated by 5x0.2. Why is the number of spacing 5? Thank you!

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2019-S4MYE-Physics P2.pdf and 1 more page - Work - Microsoft​ Edge 6_10_2021 11_22_04 AM