A cube with a mass \( =20 \mathrm{~g} \) wettable water floats on the surface of water. Each fac...

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A cube with a mass \( =20 \mathrm{~g} \) wettable water floats on the surface of water. Each face of the cube is \( \alpha=3 \mathrm{~cm} \) long. Surface tension of water is \( 70 \mathrm{dyn} / \mathrm{cm} \). The distance of the lower face of the cube from the surface of water is \( \left(g=980 \mathrm{~cm} \mathrm{~s}^{-2}\right) \)
(1) \( 2.3 \mathrm{~cm} \)
(2) \( 4.6 \mathrm{~cm} \)
(3) \( 9.7 \mathrm{~cm} \)
(4) \( 12.7 \mathrm{~cm} \)
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