A 77 -kg man stands on a spring scale in an elevator. Starting from rest, the el

Question

A 77-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 0.88 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negativeacceleration for 1.8 s, and then comes to rest. What does the spring scale register in each of the following time intervals?

(a) before the elevator starts to move

(b) during the first 0.88 s of the elevator's ascent

(c) while the elevator is traveling at constant speed

(d) during the elevator's negative acceleration

Your response differs from the correct answer by more than 10%. Double check your calculations. N

A 77-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 0.88 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.8 s, and then comes to rest. What does the spring scale register in each of the following time intervals? before the elevator starts to move during the first 0.88 s of the elevator's ascent while the elevator is traveling at constant speed during the elevator's negative acceleration Your response differs from the correct answer by more than 10%. Double check your calculations. N

Explanation / Answer

For d) Here you subtract the acceleration of the elevator(1.2/1.8=2/3)

from that due to gravity and get 9.81-(2/3)=9.14m/s^2.

Plugging this into the force equation yields

77*9.14 = 703.78N

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