Exam 8: Rotational Motion and Equilibrium

The moon has an elliptical orbit around the Earth. The lunar rotational kinetic energy increases as it comes closer to the Earth and decreases as it moves away. What mechanism changes the rotational kinetic energy?

A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg-m² and her angular speed increases to 4.0 rev/s. Determine her initial moment of inertia.

A bicycle is moving 4.0 m/s. What is the angular speed of a wheel if its radius is 30.cm?

A planet of constant mass orbits the sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's rotational kinetic energy about the sun's center?

Rotational Kinetic Energy has which of the following units?

A boy and a girl are riding on a merry-go-round that is turning. The boy is twice as far as the girl from the merry-go-round's center. If the boy and girl are of equal mass, which statement is true about the boy's moment of inertia with respect to the axis of rotation?

A 4.0 kg mass is hung from a string which is wrapped around a cylindrical pulley (a cylindrical shell) Figure 8-7 If the mass accelerates downward at 4.90 m/s², what is the mass of the pulley?

A car is traveling along a highway at 65 mph. What is the linear speed of the bottom of the tires?