1.

A man carries a bucket containing water in one hand and a live fish in the other. If he releases the fish into the bucket of water, will he carry less weight?

Answer»

Solution :The man will CARRY the same weight when he releases the live fish into the bucket of water. When the fish is released into the water of the bucket, the displaced water exerts an upthrust and hence the apparent weight of the fish will decrease. According to Newton.s third law of motion, an EQUAL reaction force will ACT downwards at the bottom of the bucket. So, the decrease in the weight of the fish becomes equal to the increase in the THRUST at the bottom of the bucket. As a result, the net weight of the bucket will remain the same and hence the man will carry the same weight as before.


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