1.

The volume of 50 g of a substance is 20 cm3. If the density of water is 1 g/cm3, will the substance sink or float when placed on the surface of water? What will be the mass of water displaced by the substance?

Answer»

Density of the substance = Mass / Volume = 50 / 20 = 2.5 g/cm3

Density of water = 1 gm/cm3

Density of the substance > Density of water 

Relative density of the substance = \(\frac{2.5\,gm/cm^3}{1\,gm/cm^3}\) = 2.5

Relative density of the substance = Weight of the substance / Weight of the water equal to the volume of the substance 

⇒ 2.5 = 50 / x 

⇒ x = 50 / 2.5 = 20 g

∴ Weight of the water displaced by the substance = 20 g



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