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Question

A piece of wax floats on brine. What fraction of its volume is immersed?
Density of water =0.95 g cm3, Density of brine =1.1g cm3.

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Solution

Given:
Density of max =0.95 g cm3
Density of brine =1.1 gcm3
Consider V to be net volume of the wax and v be the volume of the submerged part
As per the law of floatation, νV=Density of waxDensity of brine
νV=0.951.1=0.86
ν=0.86V
Hence, the piece of wax floats with 0.86thpart of its volume over the brine surface.

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