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

Physics

Larissa Ward

18 January, 10:40

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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Tyson Shea · 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