Lesson: Rotational Kinetic EnergyPhysics
In this lesson, we will learn how to calculate the rotational kinetic energy of an object from its moment of inertia and other kinematic properties.
Sample Question Videos
A neutron star of mass kg and radius 10.0 km rotates with a period of 0.02000 seconds. What is its rotational kinetic energy?
A system consists of an annular cylinder of mass 1.0 kg with inner radius 20 cm and outer radius 30 cm mounted on a disk of mass 2.0 kg and radius 50 cm. The system rotates about an axis through the centers of the annular cylinder and of the disk at 10 rev/s.
What is the moment of inertia of the system?
What is the system’s rotational kinetic energy?
The mass of a hoop of radius 3.00 m is 6.3 kg. The hoop rolls across a horizontal surface with a speed of 8.8 m/s.
What magnitude of work would be required to bring the hoop to rest?
The hoop starts to roll upward along a surface inclined at above the horizontal. How far along the incline will the hoop be displaced before coming instantaneously to rest?