A cube with a mass m $$=$$ $$20$$ g wettable by water floats on the surface of water. Each side of the cube has length l $$=$$ $$3$$ cm. The angle of contact between water and glass is zero degree and the surface tension of the water is $$7.5$$ × $$10-2$$ $$N/m$$. The distance between the lower face of the cube and the surface of the water is

Question

A cube with a mass m $$=$$ $$20$$ g wettable by water floats on the surface of water. Each side of the cube has length l $$=$$ $$3$$ cm. The angle of contact between water and glass is zero degree and the surface tension of the water is $$7.5$$ × $$10-2$$ $$N/m$$. The distance between the lower face of the cube and the surface of the water is

Infinity Learn · Accepted Answer

$$FUptthrust=$$ FSurface tension $$+$$ $$Weightl2xrg$$ $$=$$ $$4lT$$ $$+$$ mg $$(.03)2$$× $$103$$ × $$10$$ $$=$$ $$.009$$ $$+$$ $$.2$$ $$9x$$ $$=$$ $$.209$$ x $$=$$ $$.02322$$ m $$=$$ $$2.322$$ cm

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