Question

a body weighs 550 gf in air and 370 gf in water when it is completely immersed in water.Find
(1).The upthrust on the body.
(2).The volume of the body.(Density of water=1gcm-3)

Answer 1

Volume of body = 180 cc

Explanation:

When a body is immersed in a water , its weight decreases  due to upthrust of water . Thus decrease in weight = 550 - 370 = 180 G F

Thus the upthrust on body = 180 G F

Now this decrease in weight or upthrust is equal to the weight of water displaced by it .

Thus weight of water displaced is = 180 g

The density of water = 1 g/cc

Thus volume of water displaced = 180/1 = 180 cc

It is volume of body also

Therefore volume of body = 180 cc ( cubic centimeter