A 68-kg man stands on a bathroom scale inside an elevator. (a) The elevator acce

Question

A 68-kg man stands on a bathroom scale inside an elevator.     (a) The elevator accelerates upward from rest at a rate of 1.10 m/s2 for 1.50 s. What does the scale read during this 1.50 s interval?
1 N

    (b) The elevator continues upward at constant velocity for 8.50 s. What does the scale read now?
2 N

    (c) While still moving upward, the elevator's speed decreases at a rate of 0.450 m/s2 for 3.00 s. What is the scale reading during this time?
3      N     (a) The elevator accelerates upward from rest at a rate of 1.10 m/s2 for 1.50 s. What does the scale read during this 1.50 s interval?
1 N

    (b) The elevator continues upward at constant velocity for 8.50 s. What does the scale read now?
2 N

    (c) While still moving upward, the elevator's speed decreases at a rate of 0.450 m/s2 for 3.00 s. What is the scale reading during this time?
3      N

Explanation / Answer

Part A)

F = ma + mg

F = (68)(9.8 + 1.1)

F = 741.2 N

Part B)
F = mg

F = (68)(9.8)

F = 666.4 N

Part C)
F = ma + mg

F = (68)(-.45 + 9.8)

F = 635.8 N

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