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A copper wire 2.4 mm in diameter is 3 m ...

A copper wire `2.4 mm` in diameter is `3 m` long and is used to suspend a `2 kg` mass from a beam. If a trasverse disturbance is sent along the wire by striking it lightly with a pencil, how fast will the disturbance travel? The density of copper is `8920 kg//m^(3)`.

Text Solution

Verified by Experts

The correct Answer is:
B
`v = sqrt((T)/(rhoS))= sqrt((T)/(rho(pid^(2)//A)`
`=sqrt((4T)/(rhopid^(2)) , (T = mg)`
`=sqrt((4 xx 20)/((8920)(pi)(2.4 xx 10^(-3))^(2)`
`= 22 m//s`
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