One end of a copper rod is in thermal contact with a hot reservoir at T = 500 K and the other end is in thermal contact with a cooler reservoir at T = 300 K. Find the entropy change of each reservoir, and the total entropy change, when 8000 J of heat energy are conducted from one end of the rod to the other with no change in the temperature distribution in the rod.
What will be an ideal response?
?16.0 J/K, +26.7 J/K, +10.7 J/K
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Imagine that this classroom contains a constant magnetic field that points from the front to the back. In front of you a negative charge is slowly moving horizontally to your left. As you watch, the magnetic force on the charge
A. deflects the charge away from you. B. deflects the charge into a clockwise directed vertical circle. C. has no effect on the charge. D. deflects the charge into a counterclockwise vertical circle. E. deflects the charge toward you.
Which of these is NOT a vector quantity?
a. translational momentum b. angular momentum c. acceleration d. rotational kinetic energy e. velocity
The sun radiates at a power of
How long does it take for the sun to lose an amount of mass equal to the mass of the Earth 
Choose the first answer that is correct.
A. less than one year
B. less than 1000 years
C. 
D. 
E. 
Relative Velocity: A plane moving 200 m/s horizontally fires a projectile with speed 50 m/s in a forward direction 30.0° below the horizontal. At that instant, what is the speed of the projectile with respect to a stationary observer on the ground?
A. 245 m/s B. 250 m/s C. 268 m/s D. 293 m/s