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Chapter 10: Problem 83
While the centrifuges are spinning, the net force on samples in the tubes is a. outward. b. inward. c. zero.
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A circular saw takes a long time to stop rotating after the powe is turned off. Without the saw blade mounted, the motor stop much more quickly. Why?
You've got your bicycle upside down for repairs, with its 66-cm-diameter wheel spinning freely at \(230 \mathrm{rpm}\). The wheel's mass is \(1.9 \mathrm{~kg}\), concentrated mostly at the rim. You hold a wrench against the tire for \(3.1 \mathrm{~s}\), applying a \(2.7-\mathrm{N}\) normal force. If the coefficient of friction between wrench and tire is \(0.46\), what's the final angular speed of the wheel?
If both centrifuges are made thicker in the vertical direction, without changing their masses or mass distribution, their rotational inertias will a. remain the same. b. increase. c. decrease.
A potter's wheel is a stone disk \(75 \mathrm{~cm}\) in diameter with mass \(140 \mathrm{~kg}\). If the potter's foot pushes at the outer edge of the initially stationary wheel with a \(60-\mathrm{N}\) force for one-eighth of a revolution, what will be the final speed?
A \(30-\mathrm{g}\) mouse runs out to the end of the \(22-\mathrm{cm}\)-long minute hand of a grandfather clock when the clock reads 10 past the hour. What torque does the mouse's weight exert about the rotation axis of the clock hand?
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