Question

A flywheel of mass 8 kg and radius 10 cm rotating with a uniform angular speed of
5 rad /sec about its axis of rotation, is subjected to an accelerating torque of 0.01 Nm
for 10 seconds. Calculate the change in its angular momentum and change in its
kinetic energy​

Answer 1

Answer:

=20rad/s

Explanation:

The string provides a torque on the flywheel. We have torque as τ=Iα.

Thus

Fr=Iα

or

10×0.2=0.4×α

or

α=5rad/s

2

Thus after 4 seconds we have the angular velocity as

ω=0+5×4

=20rad/s

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Answer 2

Answer:

Change in angular momentum=0.1kjm^2

Change in in Kinetic Energy =0.625J

Explanation: