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

 New Problems reloads the page with new variable values in all questions. You must do this after grading the test to rework it another time. Make sure to enter your answers in the specified units .
 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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