Answered: Woman weighing 75 kg stand on a spring…

An Introduction to Physical Science

14th Edition

ISBN:9781305079137

Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Chapter3: Force And Motion

Section: Chapter Questions

Problem 7SA: It is said that Newtons first law can be derived from his second law. Explain this statement.

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Question

Woman weighing 75 kg stand on a spring scale in an elevator. During the first 3 seconds of motion
from rest, the Tension T in the hoisting cable is 8,300N. The total mass of the elevator, woman and
scale is 750 kg.

a. Find the vertical acceleration of the elevator.
b. Find the Reading R of the scale in Newton’s during this interval.
c. Find the upward velocity of the elevator at the end of 3 seconds.

Given Figure:
Elevator
75kg
T
Hoisting cable
Scale
=a=ay=?
750kg = total mass of the elevator, woman and scale

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