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Q.

A cube of wood supporting a 400 g just floats in water. When the mass is removed, the cube rises by 2 cm. What is the side of the cube nearly ?

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a

24.24 cm

b

1.414 cm

c

14.14 cm

d

28.28 cm

answer is B.

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Detailed Solution

so the weight of water displaced is 400g.

ρ(A×2)=0.4×10

So, area of cube is 200cm2.

length of each side= 14.14cm

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