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A solid weighs 30N when dipped in water and weighs 40N in air. What is the density of the solid?

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Given,
Weight of Solid in Air = 40N
Weight of Solid in Water = 30N
Relative Density of the Solid = Weight in Air / Apparent Loss of Weight in Water
                                              = 40N / 40N - 30N
                                              = 40N / 10N
                                              = 4
Hence, 
Density of the Solid = 4g/cm^3 or 4000kg/m^3
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