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A block of weight 10 N is fastened to on...

A block of weight 10 N is fastened to one end of a wire of cross sectional area `3 mm^2` and is rotated in a vertical circle of radius 20 cmk. The speed of the block at the bottom of the circle is `2ms^-1`. Find the elongation of the wire when the block is at the bottom of the circle. Young modulus of the material of the wire `=2xx10^11Nm^-2`.

A

the elongation of the wire when block is at the bottom of circle is `10^-4 cm.`

B

the elongation of the wire when block is at top of circle is `1 mum.`

C

tension in wire is 30 N.

D

tension in wire is 20 N.

Text Solution

Verified by Experts

The correct Answer is:
C
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