The length of needle foating on the surf...

The length of needle foating on the surface of water is 1.5 cm the force in addition to its weight required to lift the needle from water surface will be (surface tension of water `=7.5N//cm`)

22.5 N

2.25 N

0.25 N

225 N

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ALLEN -ELASTICITY, SURFACE TENSION AND FLUID MECHANICS-Exercise 1 (Surface Tension)

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