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Physics: Principles with Applications | 7th Edition | ISBN: 9780321625922 | Authors: Douglas C. Giancoli
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A 75.0-kg person stands on a scale in an elevator. What

Chapter 4, Problem 70

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QUESTION:

A 75.0-kg person stands on a scale in an elevator. What does the scale read (in N and in kg) when (a) the elevator is at rest, (b) the elevator is climbing at a constant speed of (c) the elevator is descending at (d) the elevator is accelerating upward at (e) the elevator is accelerating downward a

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QUESTION:

A 75.0-kg person stands on a scale in an elevator. What does the scale read (in N and in kg) when (a) the elevator is at rest, (b) the elevator is climbing at a constant speed of (c) the elevator is descending at (d) the elevator is accelerating upward at (e) the elevator is accelerating downward a

ANSWER:

Problem-70

A 75.0-kg person stands on a scale in an elevator. What does the scale read (in N and in kg) when (a) the elevator is at rest, (b) the elevator is climbing at a constant speed of 3.0 m/s (c) the elevator is descending at 3.0 m/s (d) the elevator is accelerating upward at  (e) the elevator is accelerating downward at .

                                                        Step by Step Solution

Step 1 of 5

The mass of the person is given as

Thus, the weight of the person is,

Where g is the acceleration due to gravity,

Substituting the known values,

(a) When the elevator is at rest, the only force acting on the scale is the weight of the person. Thus, the scale reads the weight of the person when the elevator is at rest.

Hence, the scale read 735 N.

If the scale measures in kg then,

The scale read

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