Question

A solid brasd cylinder tied to a thread is hanging from the hook of spring balance .The cylinder is gradually dipped into water contained in a jar. What changes do expect in the reading of the spring balance? Give reason for youranswer​

Answer 1

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When the brass cylinder is in air, the reading of the spring balance is a maximum since it's reads the weight of the cylinder in air.On gradually dipping the cylinder into the water contained in a jar,the reading of spring balance goes on decreasing as more and more volume of the cylinder gets submerged into the water.This is because the volume of water displaced by the cylinder goes on increasing as it is gradually submerged into water.Thus, the upthrust on cylinder(= weight of the water displaced) gradually increases due to which is apparent weight decreases.When the cylinder gets completely submerged into water,the reading of the spring balance becomes a minimum.On further dipping the cylinder inside water,There is no change in upthrust and hence no further change in the reading of spring balance.

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Answer 2

Answer:

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