Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 17, Problem 20P
To determine
The average translational kinetic energy of the oxygen and average speed of the nitrogen molecule.
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Consider nitrogen gas in a container at temperature T = 245 K. A molecule’s average kinetic energy is Kavg=3/2kBT. Calculate the momentum magnitude p of a nitrogen molecule having this kinetic energy.
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Decades ago, it was thought that huge herbivorous dinosaurs such as Apatosaurus and Brachiosaurus habitually walked on the bottom of lakes, extending their long necks up to the surface to breathe. Brachiosaurus had its nostrils on the top of its head. In 1977, Knut Schmidt-Nielsen pointed out that breathing would be too much work for such a creature. For a simple model, consider a sample consisting of 10.0 L of air at absolute pressure 2.00 atm, with density 2.40 kg/m3, located at the surface of a freshwater lake. Find the work required to transport it to a depth of 10.3 m, with its temperature, volume, and pressure remaining constant. This energy investment is greater than the energy that can be obtained by metabolism of food with the oxygen in that quantity of air.
Chapter 17 Solutions
Physics for Scientists and Engineers
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