A cube of wood supporting a 200 g mass just floats in water. When the mass is removed the cube rises by 2 cm at equilibrium. Find side of the cube.

5 cm

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10 cm

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20 cm

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40 cm

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Solution

The correct option is B 10 cm
$x a^{2} ρ_{H_{2} O} = 200 g \Rightarrow 2 a^{2} (1) = 200 g \Rightarrow a = 10 c m$

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