A raft of wood (density $600 g / m^{3}$ ) of mass $120 k g$ floats in water. How much weight can be put on the raft to make it just sink?

120 k g

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200 k g

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40 k g

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80 k g

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Solution

The correct option is D $80 k g$
mass of water displaced,

$= \frac{120}{600} \times 1000 = 200 k g$

mass of raft of wood,

$= 120 k g$

therefore the total weight to make the raft sink,

$= 200 - 120 = 80 k g$

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A log of wood of mass 120 Kg floats in water. The weight that can be put on the raft to make it just sink should be (density of wood=600Kg/m³)

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