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Question1

A weight lifter pulls down on a bar associated to some weights via a pulley system. He rises in the air. A second weight lifter comments that first is not strong enough to lift the weights. The first lifter claims to be very strong, and asks for assistance to hold him down. The second lifter presses down on shoulders of the first, who is next able to move the weights. Who is acceptable? Why with reasons?

Question2

Two identical conducting spheres with dissimilar charges are separated by a fixed center-to-center distance of 0.2m. Firstly, spheres attract each other with a force of 1.20N. The spheres are brought into contact and then they are returned to their original positions. Now, it is found that spheres repel one another with a force whose magnitude is equal to that of initial attractive force. What are the original charges on each sphere?

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