1.

A raft of wood (density`=600kg//m^(3))` of mass `120 kg` floats in water. How much weight can be put on the raft to make it just sink?A. 120 kgB. 200 kgC. 40 kgD. 80 kg

Answer» Correct Answer - D
Volume of the raft`=(120kg)/(0.6xx10^3(kg)/(m^3))=200xx10^-3m^3`
When the raft just sinks,
Total weight of the raft (weight of the raft`+`weight put on the raft)`=`buoyancy of water
`=(200xx10^-3m^3)(1000(kg)/(m^3))=200kgwt`
Weight that can be put on the raft`=200kgwt-120kgwt=80kgwt`


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