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Qn 4: why is the ans c and not a. In c it states that w is greater than y, wouldn’t that mean that it moves in the opposite direction than stated?

Qn 8: can explain? What is the formula and which values to use?

Qn 11. Can explain?

Qn 14: shouldn’t the image be beyond focal point creating diminished and upright? Why is the ans a

Qn 17. How does heat affect current and voltage?

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How to find F?

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Mr Chan, can you explain Qn 12?

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I never write Fnet - frict= ma.
I write F forward - frict= ma
Fnet = F resultant

Do be clear

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U want large temp diff
Either A Very hot n B very cold or
A very cold n B very hot.
If heating element at bottom
Both A n B can be hot as hot air rises

IF heating element at top only A is hot while B still cold as hot air won't sink. Thus at top then the temp different is large

Outer colour white is best as white is poor emitter of heat

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Current the light is experiencing critical angle ie 42 Deg
So if angle increase to 45 Deg means more than critical angle thus total int reflection

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Question 6 (d)

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11 (d) I do not understand the diagram

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Mr Chan, you used to write an equation that was Fnet-Ffriction=Fresultant=ma. In Qn 3, is the driving force of the car referring to Fnet or FResultant? Is driving force the same as forward force?