Problem 5.72 A Te ig penion stands on a batwoom scale and rides in an elevator v

Question

Problem 5.72 A Te ig penion stands on a batwoom scale and rides in an elevator vhose -ame gaph is shown in (Fgure 1) Express your arnwer to two signficant figures and include appropriate urvts Value Units Part Whur is the reading on the scale at - 4.0 Express your answer to two significant fiqures and include appropriate units Figure Value Units Part C Express your answer to bwo significant figures and include appropriate units Value Units 67590 IM IMG 0947jp9 IMG-0946.jpg IMG 0945 jpg IMG 0943 pg Type here to search

Explanation / Answer

A] At t=1s, vy = 2 m/s

Acceleration a = 2 m/s2

so, R = m[g+a] = 70[9.8+2] = 826 N or approximately 830 N [2 significant figures].

This is the reading on the scale.

B] At t=4s, acceleration is zero and so reading on the scale is R = 70 x 9.8 = 686 N or approximately 690 N.

C] At t=8s,

a = - 1 m/s2

so, R = m[g - a] = 70[9.8 - 1] = 616 N or approximately 620 N.

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