A boxcar of mass 125 tons at rest becomes uncoupled on a 2.0° grade. If the track is considered to be frictionless, what speed does the boxcar have after 9.0 seconds?
a. 4.0 m/s
b. 0.038 m/s
c. 31 m/s
d. 3.1 m/s
e. 0.31 m/s
d
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In order for two objects to have the same temperature, they must
a. be in thermal equilibrium. b. be in thermal contact with each other. c. have the same relative "hotness" or "coldness" when touched. d. have all of the properties listed above. e. have only properties (b) and (c) above.
A spacecraft can gain energy by passing near a planet
Indicate whether the statement is true or false
Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A. 0.82c B. 0.70c C. 0.94c D. 0.35c E. 0.57c
Thermodynamic Processes: The process shown on the pV diagram in the figure is
A. adiabatic. B. isothermal. C. isochoric. D. isobaric.