Assertion (A): A helium-filled balloon does n | vedclass

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(C) The upward force on a balloon is the buoyant force,which is equal to the weight of the air displaced by the balloon. As the balloon rises,the dens

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If $(A)$ is true but $(R)$ is false.

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(C) The upward force on a balloon is the buoyant force,which is equal to the weight of the air displaced by the balloon. As the balloon rises,the density of the air decreases with altitude. Consequently,the buoyant force decreases as the balloon gains height. At a certain altitude,the buoyant force becomes equal to the weight of the balloon (including the helium and the material of the balloon),and the net force becomes zero. At this point,the balloon stops rising. Viscosity is a property of fluids that opposes the relative motion of layers,but it is not the reason why a balloon stops rising at a specific altitude. Therefore,$(A)$ is true,but $(R)$ is false.

Assertion $(A)$: $A$ helium-filled balloon does not rise indefinitely in the air but halts after a certain height.
Reason $(R)$: Viscosity opposes the motion of the balloon. Choose any one of the following four responses:

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Assertion $(A)$: $A$ helium-filled balloon does not rise indefinitely in the air but halts after a certain height.Reason $(R)$: Viscosity opposes the motion of the balloon. Choose any one of the following four responses: