Question

An object weighs 500 grams in air. This object is then fully immersed in water. State whether it will weigh less in water or more in water. Give reason for your answer.

Answer 1

The density of the object will be less in water than air. Archimedes principle states that the upward force exerted by a fluid on the object is equal to the weight force of the fluid displaced by the object. In the air, there is an upward force on it equal to the weight of the air column displaced by it which is very little.
the displaced water is considerable in weight so the buoyant force is larger and the net force is smaller. for which reason weight is less in water.