Concept explainers
The buoyant force of air is considerably greater on an elephant than on a small helium-filled balloon. Why, then, does the elephant remain on the ground, while the balloon rises?
To explain: The reason for the elephant to remain on ground while helium balloon goes up.
Explanation of Solution
Introduction:
Buoyant force is the force that acts on an objectin upward direction. This force arises due to the pressure exerted on an object by the fluid.
Buoyant force acts on the elephant is comparatively larger than that of helium filled balloon. This is because, weight of fluid displaced by elephant is more than the weight of fluid displaced by balloon. But this doesn’t mean that elephant should rise in the air like balloon. The elephant weight is more than the buoyant force. Also, density of elephant is more than balloon. Hence downward forces overcomes the upward buoyant force.So, elephant doesn’t rise in the air.
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