Physics (5th Edition)
5th Edition
ISBN: 9780321976444
Author: James S. Walker
Publisher: PEARSON
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Chapter 5.6, Problem 6EYU
When a certain person steps onto a scale on solid ground, the reading is 750 N. When the same person rides in an elevator that accelerates, the reading on the scale is different. Rank the three cases (A, B, and C) shown in Figure 5-18 in order of increasing acceleration (from most negative to most positive) in the y direction. Indicate ties where appropriate.
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Problem 5:
In the two cases shown below, a person is standing on a scale in an elevator. The elevators are identical, and the
person weighs 500 N. In both cases the elevator is moving upward, but in Case A it is accelerating upward and in
Case B it is accelerating downward.
A
B
y = 3 m/s
v = 3 m/s
a=2 m/s?
a=2 m/s?
Will the scale reading in Case A be greater than, less than, or the same as the scale reading in Case B?
Explain with a calculation or in words.
Problem 6:
In the two cases shown below, a person is standing on a scale in an elevator. The elevators are identical, and the
person weighs 500 N. In Case A the elevator is moving upward at a constant speed, and in Case B the elevator is
moving downward at a constant speed.
A
в
y = 3 m/s
v = 3 m/s
Will the scale reading in Case A be greater than, less than, or the same as the scale reading in Case B?
Explain with a calculation or in words.
Two blocks A and B of the same mass 1.03 kg are released from rest on a 29.6° incline when they are S = 17.2 m apart, as shown. The coefficient of friction under the upper block A is 0.18, and that under the lower block B is 0.31. Compute the distanced travelled by block B (in m) until the blocks touch each other. Round off only on the final answer expressed in 3 decimal places.
Chapter 5 Solutions
Physics (5th Edition)
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