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A centipede with sixteen legs stands on water, the end of each leg has a spherical shape of radius 1 mm. Surface of water makes an angle $60 °$ with the vertical at its contact with the leg and surface tension of water at the given temperature is 72 dyne/cm, then Mass of the insect in mg, assuming that each leg bears an equal weight is nearly

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answer is 360.

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Detailed Solution

$M g = 16 \times 2 π r T c o s θ$

$M = \frac{16 π r T \cos θ}{g} = \frac{16 x 3.142 x 10^{- 3} x 72 x 10^{- 3}}{10} x \frac{1}{2} k g = 360 m g$

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