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Suppose we have a gas in thermal equilibrium at temperature T. Each molecule of the gas has mass m. (a) What is the ratio of the number of molecules at the Earth's surface to the number at height h(with potential energy mgh)? (b) What is the ratio of the density of the gas at height h to the density at the surface? (c) Would you expect this simple model to give an adequate description of the Earth's atmosphere?
Time standards are now based on atomic clocks. A promising second standard is based on pulsars, what is the associated uncertainty
A copper wire has a 25-m ohm resistance at 20 degrees C. When the wire is carrying a current, What is the change in the wire's resistance
A bowling ball encounters a 0.760-m vertical rise on the way back to the ball rack, as the drawing illustrates. Find the translational speed at the top
A boat with a horizontal tow rope pulls a water skier. how much work does the rope do on the skier during a forward displacement of 270m
A 200KeV electron (i.e., an electron having kinetic energy of 200KeV) collides with a 200KeV positron (a particle with opposite charge of electron but) moving in the opposite direction in a head-on collision.
An asteroid orbits the Sun at a constant distance of 3.540e+11 meters. The Sun's mass is 1.99×1030 kg. What is the orbital speed of the asteroid
An airplane with a speed of 73.2 m/s is climbing upward at an angle of 40° counterclockwise from the positive x axis. Calculate the distance along the ground
A 6.4 cm diameter pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, What is the volume rate of flow
an oxygen ion O2- is moving with a speed of 322 m/s in a direction perpendicular to a magnetic field of magnitude B, what is B
Mr. Gewanter, who's mass is 60.0 kg, is doing physics demonstration in the front of the classroom. a) How much gravitational force does he exert on 55-kg Martha in the front row, 1.50m away? b) How does this compare to what he exerts on 65-kg Lest..
Electron acquires 5x10^-16 kinetic energy when it is accelerated by an electric field from Plate A to Plate B, what is the potential difference Vba between the two plates
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. How many revolutions per minute is the sample making
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