Question

An object weighs 10 N in air. When immersed fully in a liquid, it weighs only 8 N. The weight of liquid displaced by the object will be (a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N

Answer 1

Answer:

According to Archimedes Principle "when a body is fully or partially immersed in a fluid at rest,it appears to lose weight.In other words,

 Apparent weight W′=W−Fb

where Fb is buoyancy force which is equal to weight of displaced liquid.

Apparent weight 8N=10N−Fb

Fb=2N

 or the weight of the liquid displaced by the object 2N.