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
A particle on the surface of the Earth can "escape" the Earth's gravitation and continue to move away from the Earth forever, if it has a sufficient speed (called
the escape speed).
(a) Determine the escape speed (in m/s) if the particle is an oxygen molecule. Use 6.37 x 106 m for radius of the Earth.
m/s
(b) Determine the temperature (in K) at which the rms speed of the oxygen molecule is 13 times the escape speed.
T =
K
(c) What If? The Universe is composed of 75% hydrogen and 25% helium by mass, yet these gases are not found in the Earth's atmosphere. Calculate the
temperatures (in K) for which the minimum escape kinetic energy is nine times the average kinetic energy of hydrogen (H₂) molecules and helium atoms.
K
K
TH2
THE
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
Chapter 18 Solutions
University Physics with Modern Physics (14th Edition)
Physics for Scientists and Engineers with Modern Physics
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