solution

Q.1. - A block weighs 165 g in air  and 130 g in water. Calculate the volume and specific gravity.

 

Solution  - 

Let the volume of block be V

 

By Archimede's principle, 

 

mass of object in air  - apparent mass when submergerd in water = density of water x volume of object 

 

165 g - 130 g = 1 x V 

V = 35 g 

 

Specific gravity also known as relative density = density of object/density of water = mass of object in air/Volume of object/density of water

Thus, 

Specific gravity = 165/35/1 = 4.7