Posted by **phys101** on Friday, October 21, 2011 at 7:57pm.

A flywheel in the form of a heavy circular

disk of diameter 0.83 m and mass 111 kg is

mounted on a frictionless bearing. A motor

connected to the flywheel accelerates it from

rest to 1430 rev/min.

a)What is the moment of inertia of the fly-

wheel?

Answer in units of kg ยท m2

b) After 1430 rev/min is achieved, the motor is

disengaged. A friction brake is used to slow

the rotational rate to 834 rev/min.

What is the magnitude of the energy dissi-

pated as heat from the friction brake?

Answer in units of J

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