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Standard XII

Physics

Terminal Velocity

An inflated b...

Question

An inflated balloon rises to a definite height once it starts going up. This balloon cannot rise any further because at that height _________.

atmospheric pressure reduces to zero

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apparent weight of the balloon reduces to zero

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density of the balloon reduces to zero

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acceleration due to gravity reduces to zero

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Solution

The correct option is A apparent weight of the balloon reduces to zero
The inflated balloon rises due to buoyancy force from surrounding atmosphere, in the upward direction.
As it rises, the density of air gets lower and the buoyancy force decreases.
At certain height, it becomes equal to the gravitational force in the downward direction. So it doesn't rises further.

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