Equilibrium: A piano mover raises a 1000-N piano at a constant speed using a very light rope in a frictionless pulley system, as shown in the figure. With what force is the mover pulling down on the rope?
A. 2000 N
B. 1000 N
C. 500 N
D. 250 N
E. Depends on the speed of the piano.
Answer: C
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