Two identical blocks, A and B, on a surface of negligible , The hand exerts a co

Question

Two identical blocks, A and B, on a surface of negligible , The hand exerts a constant force friction are connected by a spring of negligible mass. The spring is initially unstretched. During the interval from t, to 12 block A is pushed through a distance dA by a hand exerting a force of magnitude FA, as shown. Block B is held in place by a wall. The wall exerts a force on block B that varies with time but is always directed to the left. of magnitude F 1 A A. a. During the interval from ti to Is the work done on block A by the hand positive, negative, or zero? Explain. i. ii. Is the work done on block B by the wall positive, negative, or zero? Explain. ii. Let system X consist of block A, block B, and the spring. Write an expression for the net work done on system X by external forces in terms of the given quantities. Explain.

Explanation / Answer

(i) work done will be positive

(ii)work is zero bcoz displacement of block B is zero

(iii)net work done is the gain in potential energy of the spring = (kd2)/2

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