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Q.

A log of wood of mass 80kg floats in water the weight that can be on the raft to make it just sink should be. (density of wood=600 kg/m3 )

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a

73.4 kg

b

53.3 kg

c

48.8 kg

d

64.6 kg

answer is B.

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Detailed Solution

(80+m)g=vBdwaterg                 (80+m)=80600×1000                 ⇒m=8006−80=800−4806=3206=53.3grms
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