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A flywheel of moment of inertia 0.4 kg m...

A flywheel of moment of inertia 0.4 kg `m^(2)` and radius 0.2 m is free to rotate about a central axis. If a string is wrapped around it and it is pulled with a force of 10N. Then its angular velocity after 4s will be

A

`10 rad s^(-1)`

B

`5 rad s^(-1)`

C

`20 rad s^(-1)`

D

None

Text Solution

Verified by Experts

c) As , `rho= F xx r = lalpha`
`=l(omega_(2)-omega(1))/t`
`therefore` `omega_(2)-omega_(1) = (Fxxrxxt)/l`
`=(10 xx 0.2 xx 4)`
`=20rads^(-1)`
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