Question

An object of 40 N weight when immersed in water looses 10 N weight . Will the object float or sink . Why ?

Answer 1

We are aware of the fact that the object will sink if the weight of that particular object is more than the buoyant force of the liquid in which is sinking and will keep afloat otherwise.

So the weight of the body is 40 N

and the apparent weight is 30 N 

In order to calculate the buoyant force, of the body we will subtract 40 N - 30 N which will be equal to 10 N

So now the apparent weight is more than the buoyant force, so the object will not be able to keep afloat and would sink under its own weight.