Part A 1. What will a spring scale read for the weight of a 71.0-kg woman in an

Question

Part A

1. What will a spring scale read for the weight of a 71.0-kg woman in an elevator that moves upward with constant speed of 5.6 m/s?

Part B

2. What will a spring scale read for the weight of a 71.0-kg woman in an elevator that moves downward with constant speed of 5.6 m/s?

Part C

3. What will a spring scale read for the weight of a 71.0-kg woman in an elevator that moves upward with acceleration of 0.30 g?

Part D

4. What will a spring scale read for the weight of a 71.0-kg woman in an elevator that moves downward with acceleration of 0.30 g?

Part E

5. What will a spring scale read for the weight of a 71.0-kg woman in an elevator that is in free fall?

Explanation / Answer

A) w = mg = 71*9.8 = 696.51 N

B) w = mg = 696.51 N

C) w = m (g +a) = 71*(9.81 + 0.3*9.81) = 905.463 N

D) w = m (g - a) = 71*(9.81 - 0.3*9.81) = 500.976 N

E) Free fall R = m ( g - g ) = 0

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