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Q.

A U-tube having horizontal arm of length 20 cm, has uniform cross-sectional area =1 cm2. It is filled with water of volume 60cc. What volume of a liquid of density 4 g/cc should be poured from one side into the U-tube so that no water is left in the horizontal arm of the tube?

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a

45cc

 

b

35cc

c

60cc

d

50cc

answer is D.

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Detailed Solution

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ρ1gh1=ρ2gh2   (4)(g)(x)=(1)(g)(60) or x=15 cm Total volume of liquid=(20+15)cm3 =35 cm3

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A U-tube having horizontal arm of length 20 cm, has uniform cross-sectional area =1 cm2. It is filled with water of volume 60cc. What volume of a liquid of density 4 g/cc should be poured from one side into the U-tube so that no water is left in the horizontal arm of the tube?