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Q.

A cubical block of wood specific gravity 0.5 and chunk of concrete of specific gravity 2 . 5 are fastened together. The ratio of the mass of wood to the mass of concrete, which makes the combination to float with its entire volume submerged under water is

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a

1/5

b

1/3

c

3 /5

d

2/5

answer is C.

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Detailed Solution

Let the mass of wood and concrete be M and m respectively. ThenM0⋅5+m2⋅5=(M+m) M10⋅5−1=m1−12⋅5 M=m1⋅52⋅5 or Mm=35

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