A 66-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.90 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.6 s, and then comes to rest. What does the spring scale register in each of the following time intervals?

Question

Gwendolyn Benson

Physics

21 March, 08:01

A 66-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.90 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.6 s, and then comes to rest. What does the spring scale register in each of the following time intervals?

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Answers (1)

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Kira Andrews · Answer 1

Answer:735.46N, 626.34N

Explanation: when an elevator ascend, it means it moving against gravity

F = m (a+g)

M=66kg

a=v/t

g=9.81m/s^2

For the first a = 1.2/0.9

a=1.2/0.9

a=1.33m/s2

F=66 (1.33+9.81)

F=66 (11.143)

F=735.46N

F=m (a+g)

a=v/t

a=-1.6/5

a=-0.32m/s2

F=66 (-0.32+9.8)

F=66 (9.49)

F=626.34N