A 60-kg housepainter stands on a 15-kg aluminum platform.
Chapter , Problem 79(choose chapter or problem)
A 60-kg housepainter stands on a 15-kg aluminum platform. The platform is attached to a rope that passes through an overhead pulley, which allows the painter to raise herself and the platform (Figure 4-57). (a) With what force F must she pull down on the rope to accelerate herself and the platform upward at a rate of (b) When her speed reaches 1.0 m/s, she pulls in such a way that she and the platform go up at a constant speed. What force is she exerting on the rope now? (Ignore the mass of the rope.) SSM 0.80m>s2?
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