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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. 200kgC. 40kgD. 80kg |
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Answer» Correct Answer - D Volume of raft = `V = (mass)/(density)` `V= 120/600 = 1/5 m^(3)` when the raft is totally immersed in water, it displacess `1/5 m^(3)` water, so the upthrust `=1/5 xx 1000 xx g newton if `x kg` is the extra weight put on the raft to fully immerse it in water, then `(x+120)g = 1/5 xx 1000 xx g or = x + 120 = 200` `x =80 kg`. |
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