Question

An elastic string carrying a body of mass at one end extends by . If the body rotates in vertical circle with critical velocity, the extension in the string at the lowest position is:

A

B

C

D

Hard

Solution

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Correct option is D)

When the body is at rest, the extension is while force acting on it is
Force when it reaches bottom is
Now using energy balance between topmost point and bottom most point ,
(h is the height difference between the top and bottom point ; is critical velocity at topmost point )

or,
So,
Using this in: , we get:

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Solution To Question ID 20222
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