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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A 75 kg woman stands on the edge of a horizontal turntable. The moment of inertia of the turntable is 750 kg.m2 and the radius is 3.5 m. The turntable, which is initially stationary, can rotate freely about the frictionless vertical axis passing through its center. The woman starts walking clockwise (when viewed from above) along the edge of the table at a constant speed of 0.50 m/s with respect to the ground. How much work did the woman do to make herself and the turntable movable?
A)
99.90 J
B)
20.86 J
C)
64.00 J
D)
43.65 J
E)
65.40 J
A 12.0 m long uniform beam with a total weight of 840 N is clamped horizontally to the top of a wall with 4.0 m projecting over one side and 8.0 m projecting over the other side (see Fig. 6-33). Determine the total moment of force exerted by the beam at the wall.
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.
Chapter 8 Solutions
COLLEGE PHYSICS
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