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Physics Help >> Index to Physics Homework Help » Rotation Quiz 1


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1
An ice skater spins with an angular speed of rev/s. She brings her arms in and her new angular speed is rev/s. By what factor did her rotational inertia change?

2
If a planet takes about h to rotate about its axis, what is the planet's angular speed in rad/s?

3
A wheel with a radius of m and rotating at rev/s slows to rev/s over a period over an interval of 3.00 s. What is the angular acceleration of the wheel in rev/s/s?

4

A solid disk rolls along a horizontal surface so that its center proceeds to the right with a speed of m/s. What is the instantaneous speed (in m/s) of point B with respect to the ground?



5

A force of N is applied to a doorknob at an angle of º to the door. The hinge is cm from the doorknob. What is the torque (in N-m) on the door?




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