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When a celling fan is switched off, its ...

When a celling fan is switched off, its angular velocity falls to half while it makes `36` rotations. How many more rotations will it make before coming to rest ?

A

`18`

B

`12`

C

`36`

D

`48`

Text Solution

Verified by Experts

`((omega)/(2))^(2)=omega^(2)-2alpha(36xx2pi)` (`i`)
`0=((omega)/(2))^(2)-2alpha(nxx2pi)` (`ii`)
`(36)/(n)=(3//4)/(1//4)=3implies n=12`
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