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A cylindrical...

Question

A cylindrical block is floating (partially submerged) in a vessel containing water. Initially, the platform on which the vessel is mounted is at rest. Now the platform along with the vessel is allowed to fall freely under gravity. As a result, the buoyancy force:

A

becomes zero

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B

decreases

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C

increases

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D

information is insufficient

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Solution

The correct option is A becomes zero
When the platform is allowed to fall freely, apparent weight of the block becomes zero i.e. block exerts no force on water.Hence no water is displaced due to weight of the block. So buoyant force will also become zero.

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