COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 8, Problem 106QAP
To determine
The direction and the magnitude of the friction force
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4 m
37°
R
Figure 8-61
Problem 58.
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** A cylindrical bar with a sphere firmly attached to one end is originally at rest in a horizontal position. The bar is pivoted about
a free hinge at one end (Figure 8-61). The bar is 4.00 m long and has a mass of 231 kg. The sphere has a radius of 60.0 cm and a
mass of 53.0 kg. A variable torque is applied to lift the bar by rotating it 37.0° about the pivot at a constant angular speed. Calculate
the work done by the variable torque.
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kJ
pulley
M1
m2
Figure 8-73
Problem 88.
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** In Figure 8-73, a block of mass with m1
16 kg sits on the surface of a bench so the coefficient of static friction between
the block and the surface is 0.20. Find the maximum weight that can hang down from the outer cylinder (R = 34 cm) of the pulley
without causing mito move. The radius, r, of the inner cylinder is 12 cm.
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kg
3- A massless string is wrapped around a disk of mass M and radius R. The free end of the string
is held to let the disk unwrap the string and fall. Assuming that the string does not
a) Does the force of tension in the string do work? Justify your answer
slip,
to
b) Using the conservation of energy, find the speed of the center of mass of the disk when
it has moved down by a height h. Write your answer in terms of mass M, the height h,
and the gravitational acceleration g?
Chapter 8 Solutions
COLLEGE PHYSICS
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