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A test tube of mass 20 gm is filled with...

A test tube of mass `20 gm` is filled with a gas and fitted with a stopper of `2 gm`. It is suspended horizontally by means of a thread of `1m` length and heated. When the stopper kicks out, the tube just completes a circle in vertical plane. The velocity with which the stopper kicked out is

A

`7 ms^(-1)`

B

`10 ms^(-1)`

C

`70 ms^(-1)`

D

`0.1 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`M sqrt(5gl) = mv`.
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