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Q.

A wire is elongated by 2 mm when a brick is suspended from it. When the brick is immersed in water, the wire contracts by 0.6 mm. What is the density of brick ?

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a

3333  kg/m3

b

4210  kg/m3

c

5000  kg/m3

d

2000  kg/m3

answer is A.

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Detailed Solution

Δl=FlAY……(1)∴     Δl'Δl=  F'F=mg−ρω.Vgmg  =  mg−mρB . ρω  .g mg=1−ρωρB∴      ρB = ρω1−Δl'Δl=3333   kg/m3.
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