Problem 6.29 Part 1: What will a spring scale read for the weight of a 51-kg wom

Question

Problem 6.29

Part 1: What will a spring scale read for the weight of a 51-kg woman in an elevator that moves upward with constant speed 5.0 m/s? Express your answer using two significant figures.

Part 2: What will a spring scale read for the weight of a 51-kg woman in an elevator that moves downward with constant speed 5.0 m/s? Express your answer using two significant figures.

Part 3: What will a spring scale read for the weight of a 51-kg woman in an elevator that moves upward with acceleration 0.35g? Express your answer using two significant figures.

Part 4: What will a spring scale read for the weight of a 51-kg woman in an elevator that moves downward with acceleration 0.35 g ? Express your answer using two significant figures.

Part 5: What will a spring scale read for the weight of a 51-kg woman in an elevator that moves in free fall? Express your answer using two significant figures.

Explanation / Answer

Part a) R = mg = 51 kg * 9.81 m/s^2 = 499.8 N or 500 N

Part b) Net (F) = 499.8 N or 500 N

Part c) R = ( 0.35 + 1 ) * 51 * 9.8 = 674.73 N

Part d) R = ( 1 - 0.35 ) * 9.8 * 51 = 324.87 N

Part e) R = 0 N

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