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Q.

A wooden cube floating in water supports a mass m=0.2 kg on its top. When the mass is removed the cube rises by 2 cm. The side of the cube is (density of water=103kg/m3)

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a

12 cm

b

 6 cm

c

10 cm

d

8 cm

answer is D.

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Detailed Solution

Decrease in weight = Decrease in Upthrust

Or mg=Vρwg  Or m=Vρw

Or (0.2)=2×10−2(A)103

Or  A=10−2m2=100cm2

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