A window washer pulls herself upward with a bucket-pulleyapparatus. The mass of

Question

A window washer pulls herself upward with a bucket-pulleyapparatus. The mass of the person plus the bucket is 58kg. * How hard must she pull downward to raise herself at aconstant speed? *If she increases this force by 12%, what will heracceleration be? A window washer pulls herself upward with a bucket-pulleyapparatus. The mass of the person plus the bucket is 58kg. * How hard must she pull downward to raise herself at aconstant speed? *If she increases this force by 12%, what will heracceleration be?

Explanation / Answer

net force = m*a = 0 = F - mg               (the force she exerts is in the opposite direction of herweight) F = mg = (58 kg)*(9.8 m/s2) = 568.4 N = 5.7 x102 N m*a = F*1.12 - mg = (m*g)*(1.12) -mg = 0.12*mg a = 0.12*g = 0.12*(9.8 m/s2) = 1.17600 m/s2 = 1.2m/s2

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