Q1 of 16 Page 25

The weight of a piece of stone in air is 120 N and its weight in water is 10 N. Calculate the buoyancy, experienced by the stone.

Buoyancy is the upthrust on the immersed body, by the water displaced. It acts in a direction opposite to the weight. So the weight of an immersed object reduces in water, by an amount equal to the upthrust.

Given,


Weight of a piece of stone in air = 120 N


Weight in water = 10 N


Weight in water = Weight in air-Buoyant force


Thus, buoyancy = Weight in air- Weight in water


= 120-10 = 110 N.


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