A2 - PHYS 258 - Thermal Physics: Student ID: Assignment 2...

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PHYS 258 - Thermal Physics: Assignment 2 Due Monday January 24 Student ID: Last Name: Score: /12 1. Short questions [0.5+0.5] Calculate the internal energy in a liter of helium at room temperature and atmospheric pressure. Repeat the calculation for a liter of N 2 . [1] Suppose you have a gas containing hydrogen molecules and oxygen molecules, in thermal equilibrium. Which molecules are moving faster, on average? By what factor? [0.5] Estimate the volume of one mole of air, at room temperature and room pressure. [0.5] Estimate the speed of hydrogen molecule at room temperature. 2. Conceptual Question [3]. Two identical bubbles of gas form at the bottom of a lake, then rise to the surface. Because the pressure is much lower at the surface than at the bottom, both bubbles expand as they rise. However, bubble A rises very quickly, so that no heat is exchanged between it and the water. Meanwhile, bubble B rises slowly (impeded by a tangle of seaweed), so that it always remains in thermal equilibrium with
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This note was uploaded on 06/11/2011 for the course PHYS 258 taught by Professor Yurileonenko during the Winter '11 term at Waterloo.

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A2 - PHYS 258 - Thermal Physics: Student ID: Assignment 2...

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