A hydrogen-filled balloon stops rising after it has attained a certain height in the sky…
Physics · JEE Main · NTA Exams — Properties of Solids and Liquids
A hydrogen-filled balloon stops rising after it has attained a certain height in the sky. This happens because
- the atmospheric pressure decreases with height and becomes zero when maximum height is attained
- the temperature of the air at maximum height equals that of the hydrogen in the balloon
- viscous effects become negligible
- at the highest point, the density of air is such that the buoyant force on the balloon equals its weight
Answer
(D) at the highest point, the density of air is such that the buoyant force on the balloon equals its weight
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