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Q.

A glass flask having mass 390 g and an interior volume of 500 cm3 floats on water, when it is less than half filled with water. The density of the material of the flask is:

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a

0.8 g/cc

b

2.8 g/cc

c

1.8 g/cc

d

0.28 g/cc

answer is B.

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Detailed Solution

According to Archimedes' principle390 g +250 ρwg=Vρwg                            V=640 cm3Volume of glass =640-500=140 cm3∴Density of material of flask a =390140=2.8 g/cc
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