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Floating

A cube of sid...

Question

A cube of side 20cm is floating on liquid with 5cm of the cube outside the liquid. If the density of liquid is 0.8 gm/c.c then the mass of the cube is

A

4.2 kg

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B

4.8 kg

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C

5 kg

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D

5.2 kg

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Solution

The correct option is B
4.8 kg

Mass of the cube = $V_{i n} . ρ = (l_{i n} b_{i n} h_{i n}) ρ$

$= (15 \times 20 \times 20) (0.8) = 6000 \times \frac{8}{10} g m = 4.8 k g$

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