CP (a) Compute the increase in gravitational potential energy for a nitrogen molecule (molar mass 28.0 g/mol) for an increase in elevation of 400 m near the earth’s surface. (b) At what temperature is this equal to the average kinetic energy of a nitrogen molecule? (c) Is it possible that a nitrogen molecule near sea level where T = 15.0°C could rise to an altitude of 400 m? Is it likely that it could do so without hitting any other molecules along the way? Explain.
CP (a) Compute the increase in gravitational potential energy for a nitrogen molecule (molar mass 28.0 g/mol) for an increase in elevation of 400 m near the earth’s surface. (b) At what temperature is this equal to the average kinetic energy of a nitrogen molecule? (c) Is it possible that a nitrogen molecule near sea level where T = 15.0°C could rise to an altitude of 400 m? Is it likely that it could do so without hitting any other molecules along the way? Explain.
CP (a) Compute the increase in gravitational potential energy for a nitrogen molecule (molar mass 28.0 g/mol) for an increase in elevation of 400 m near the earth’s surface. (b) At what temperature is this equal to the average kinetic energy of a nitrogen molecule? (c) Is it possible that a nitrogen molecule near sea level where T = 15.0°C could rise to an altitude of 400 m? Is it likely that it could do so without hitting any other molecules along the way? Explain.
(a) What is the average kinetic energy (in J) of hydrogen atoms on the 5500°C surface of the sun?
0.00000000000CX J
(b) What is the average kinetic energy (in J) of helium atoms in a region of the solar corona where the temperature is
5.20 x 105 K?
0.0000000000OC
Your answer is partially correct.
The temperature near the surface of the earth is 297 K. A xenon atom (atomic mass = 131.29 u) has a kinetic energy equal to the
average translational kinetic energy and is moving straight up. If the atom does not collide with any other atoms or molecules, then
how high up would it go before coming to rest? Assume that the acceleration due to gravity is constant during the ascent.
Number
2.8e4
Units
m
In 1992, a Danish study concluded that a standard toy balloon, made from latex and filled with helium, could rise to 10,000 m (where the pressure is 1/3 of that at sea level) in the atmosphere before bursting. In the study, a number of balloons were filled with helium, and then placed in a chamber maintained at −20°C. The pressure in the chamber was gradually reduced until the balloons exploded, and then the researchers determined the height above sea level corresponding to that pressure. Assume each balloon was filled with helium at +20°C and at about atmospheric pressure. Determine the balloon's volume just before it exploded, if its volume when it was first filled was 500 cm3.
Chapter 18 Solutions
University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)
Physics for Scientists and Engineers with Modern Physics
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