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A cube with a mass m = 20g wettable by w...

A cube with a mass m = 20g wettable by water floats on the surface of water. Each face of the cube is a = 3cm long. Surface tension of water is 70 dyne/cm. The distance of the lower face of the cube from the surface of water is (x+0.3)cm. Find x. (g = 980cm/`s^2`)

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