Explaining Diagrams using Physic concepts

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The discussion revolves around explaining diagrams related to work and power in physics. Key concepts include defining work as the energy transferred when a force moves an object and power as the rate at which work is done. The boy moving upstairs does work against gravity, and his power output varies based on the speed of his ascent. He reaches the top of the stairs sooner when he moves faster, which also results in higher power exertion. Understanding these principles is crucial for analyzing the diagrams effectively.
NachoKing
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Here I have a question which I'm unfamilar with. I'm not sure how to answer the question by explaining what is involved with the diagram.

Discuss the following pictures in terms of work and power outlining any assumptions that you make.

Capture1.PNG
 
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What is work and power? Does the boy do work while moving upstairs? When does he reach the top of stairs sooner? When does he exert higher power?

ehild
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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