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Question

A piece of steel has a weight W in air. W1 when completely immersed in water and W2 when completely immersed in an unknown liquid. the relative density (specific gravity) of liquid is :

A
WW1WW2
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B
WW2WW1
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C
W1W2WW1
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D
W1W2WW2
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Solution

The correct option is A WW1WW2
Weight of the body in any liquid = Weight in air- Buoyancy force

W1=WF1

Buoyancy force in water F1=Vρwg

W1=WVρwg ...(1)

in another liquid

W2=WF2

Buoyancy force in liquid F1=Vρlg

W2=WVρlg ...(2)

solving (1) and (2)

ρlρw=WW1WW2

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