Mass of an object is 60 kg.This object is immersed in water and displaces 20 kg of water. Calculate the mass and the weight of the object in water?

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Solution

Mass of the object would remains the same even if the object is immersed in water. Its weight would reduce but not the mass. So the mass in water would be 60 kg only.
Mass of the object M = 60 kg

Weight of the object in water= Weight of object in air – force of buoyancy by water

= Mg – F_b

F_b = weight of displaced water = (20) × g = (20 × 9.8) N

So, weight in water= (60 × g) – (20 g)

= 40g= 40 × 9.8=392 N

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