Answered: Long-distance balloon flights are…

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: The Kinetic Theory Of Gases

Section: Chapter Questions

Problem 21.51AP: A certain ideal gas has a molar specific heat of Cv = 72R. A 2.00-mol sample of the gas always...

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Long-distance balloon flights are usually made using a hot-airballoon/ helium-balloon hybrid. The balloon has a sealed, flexible chamber of helium gas that expands or contracts to keep the helium pressure approximately equal to the air pressure outside. The helium chamber sits on top of an open (that is, air can enter or leave), constant-volume chamber of propane-heated air. Assume that the hot air and the helium are kept at a constant temperature by burning propane.

A balloon is launched at sea level, where the air pressure is 100 kPa. The density in the hot-air chamber is 1.0 kg/m³. What is the density of the air when the balloon has risen to a height where the atmospheric pressure is 33 kPa?
A. 3.0 kg/m³
B. 1.0 kg/m³
C. 0.66 kg/m³
D. 0.33 kg/m³

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