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The length of a seconds hand in watch is...

The length of a seconds hand in watch is `1 cm.` The change in velocity of its tip in `15 s` is

A

zero

B

`(pi)/(30sqrt(2)) cm//sec`

C

`(pi)/(30) cm//sec`

D

`(pi sqrt(2))/30 cm//sec`

Text Solution

Verified by Experts

The correct Answer is:
d
`Deltav=2v sin ((90^(@))/2)`
`=2v sin 45^(@)=2vxx1/(sqrt(2))=sqrt(2)v`
`=sqrt(2)xxr omega=sqrt(2)xx1xx(2pi)/60=(sqrt(2)pi)/(30) cm//s`
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