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The length of a rubber cord floating on ...

The length of a rubber cord floating on water is 5 cm. The force needed to pull the cord out of water is ….N (surface tension of water is `7.2xx10^(-4)Nm^(-1)`).

A

`7.2xx10^(-3)`

B

`7.2xx10^(-4)`

C

`7.2xx10^(-5)`

D

`7.2xx10^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`T=(F)/(2l)`
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Knowledge Check

  • The length of a needle floating on water is 2.5 cm . The minimum force in addition to its weight needed to lift the needle above the surface of water will be (surface tension of water is 0.072 N//m )

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