Assess what should be the acceleration of gravity g on the planet, so that man could stand on water in the shoes whose soles do not wet the water. Assume that the soles are circles of radius 10 cm and mass of man is 50 kg. Surface tension of water is 0.07 N/m.

Engineering

Physics

Surface Tension

Question

56π × 10^–5 m/s²

7π × 10^–5 m/s²

28π × 10^–5 m/s²

14π × 10^–5 m/s²

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2πr × 5 × 2 = mg

$g = \frac{2 πr 5}{m} = \frac{2 π \times 0 .1 \times 2 \times 0 .07}{50} = 56 π \times 10^{- 5} m / s^{2}$

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