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Chapter 12: Q. 26 (page 331)
A 1.0 kg ball and a 2.0kg ball are connected by a 1.0 m rigid, massless rod. The rod is rotating about its center of mass at 20 rpm. What net torque will bring the balls to a halt in 5.0 s?
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A 200 g, 40-cm-diameter turntable rotates on frictionless bearings at 60 rpm. A 20 g block sits at the center of the turntable. A compressed spring shoots the block radially outward along a frictionless groove in the surface of the turntable. What is the turntable’s rotation angular velocity when the block reaches the outer edge?
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a. What is the drill's angular acceleration?
b. Through how many revolutions does it turn during this first ?
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a. What is the distance from the apex (the point) to the center of mass?
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Hint: The moment of inertia can be calculated as the sum of the moments of inertia of lots of small pieces.
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