I need answer for this 2 problems! 1. A person squeezes a balloon horizontally w

Question

I need answer for this 2 problems!

1. A person squeezes a balloon horizontally with both hands while holding it at rest, decreasing its width by a certain amount. Is the work done on the balloon by the person positive, negative, or zero? 

A. Positive. 

B. Negative. 

C. Zero. 

D. One needs more information to answer.

2. An external interaction exerts a force on a certain system as the place where the force is applied moves a displacement . Which of the following is the correct component expression for the work done by the interaction on the system? 

A. W = [Fx dx, Fy dy, Fz dz]. 

B. W = |[Fx dx, Fy dy, Fz dz]|.

C. W = Fx dx + Fy dy + Fz dz.

D. Some other expression (specify)

Explanation / Answer

1) (C) Zero

The work done is PdV, where P is the pressure and dV is the change in volume.

Here, the pressure is constant, dV = 0. So the work done is also zero.

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