COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 58QAP
To determine
Draw a free body diagram for a box pushed horizontally across a frictionless smooth floor with steadily increased speed
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The uniform crate has a mass of 150 kg. If the coefficient of static friction between the crate and the floor is us = 0.2, determine the smallest mass of the man so he can move the crate. The coefficient of static friction between his shoes and the floor is us = 0.45.
Assume the man exerts only a horizontal force on the crate
2.4 m
1.6 m
-1.2 m-
PROBLEM 2
• An elevator and its load have a total mass of
800kg.Find the tension in the supporting
cable when the elevator or lift originally
moving downwards at 10m/s is brought to
rest with a constant acceleration in a distance
25m
Answer T-9600N.Since T> W the system is
retarding.
**.59 SSM ILW In Fig. 6-45, a 1.34
kg ball is connected by means of two
massless strings, each of length L =
1.70 m, to a vertical, rotating rod.
The strings are tied to the rod with
separation d = 1.70 m and are taut.
The tension in the upper string is
35 N. What are the (a) tension in the
Rotating rod
lower string. (b) magnitude of the
net force Feet on the ball, and (c)
speed of the ball? (d) What is the di-
rection of Faet?
Flg. 6-45 Problem 59.
Chapter 4 Solutions
COLLEGE PHYSICS
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Newton's Second Law of Motion: F = ma; Author: Professor Dave explains;https://www.youtube.com/watch?v=xzA6IBWUEDE;License: Standard YouTube License, CC-BY