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A body starts ratating from rest and com...

A body starts ratating from rest and completes 100 revolutions in 20 s. Find its angular acceleration

A

`pirads^(-2)`

B

`5pirads^(-2)`

C

`4.5pirads^(-2)`

D

`3.5pirads^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`theta =2pin =2pi xx100=200pit=20s`
`omega_0=0starts from rest `
`thereforeWe have theta=omega_0t+1/2xxt^2`
`rArr 200pi=0+1/2xx.20xx20`
`angular accleraton alpha=(200pixx2)/(20xx20)=pirads^(-2)`
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