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Q.

A wooden cube just floats inside water when a $800 g$ mass is placed on it. When the mass is removed, the cube is $2 c m$ above the water level. What is the size of each sides of the cube? (cm)(Density of water=1gm/cm3).

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answer is 20.

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Detailed Solution

Let a be the size of each side of the cube. Then,

$800 \times g = (2) \times (a^{2}) \times 1 \times g ∴ a = 20 c m$

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A wooden cube just floats inside water when a 800 g mass is placed on it. When the mass is removed, the cube is 2 cm above the water level. What is the size of each sides of the cube? (cm)(Density of water=1gm/cm3).