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The length of a rubber cord floating on water is 5 cm. The for

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Solving time: 3 mins

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 $7.2 \times 1 0^{- 4} N m^{- 1}$ )

7.2 \times 1 0^{- 3} N

7.2 \times 1 0^{- 4} N

7.2 \times 1 0^{- 5} N

7.2 \times 1 0^{- 2} N

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Camila Discussed

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

7.2 \times 1 0^{- 4} N m^{- 1}

)

7 mins ago

Discuss this question LIVE

7 mins ago

Text solutionVerified

Surface Tension is acting on both side of cord.

∴ F = 7.2 \times 1 0^{- 4} \times 2 \times (.05)

= 7.2 \times 1 0^{- 5} N

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Question Text	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 $7.2 \times 1 0^{- 4} N m^{- 1}$ )
Topic	Mechanical Properties of Fluids
Subject	Physics
Class	Class 11
Answer Type	Text solution:1
Upvotes	127