COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 8, Problem 81QAP
To determine
The torque about the axis that passes through the bolt
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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 popular abdominal exercise is called the "Scissor Abs". Logan has completed 35 full lifts with both legs. He then continues to lie on the floor with his left leg pointing straight up (bottom of foot facing up so that his left leg is perpendicular to the floor) and his right leg resting on the floor. If Logan allows his leg to fall freely until it hits the floor what is the tangential speed of his left foot just before it hits the floor. Assume his leg can be treated as a uniform rod of length 0.90 m long that pivots freely about the hip.
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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