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Question

A cube of ice floats partly in water and partly in oil. Find the ratio of the volume of ice immersed in water to that in oil. Specific gravity of oil is 0.8 and that of ice is 0.9

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Solution

Specific gravity of water ρw=1gm/cc
Specific gravity of ice ρice=0.9gm/cc
Specific gravity of kerosene ρk=0.8gm/cc
Now,
Vice=Vk+Vw
here,
Vk= Volume of ice in the kerosene
Vw= Volume of ice in the water
Vice= Volume of ice
Thus,
Vice×ρice×g=Vk×ρk×g+Vw×ρw×g
(Vk+Vw)×ρice=Vk×ρk+Vw×ρw
(Vk+Vw)×0.9=Vk×0.8+Vw×1
(0.1)Vw=(0.1)Vk
VwVk=1
Vw:Vk=1:1

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