The efficiency of a heat engine
a. can never exceed the Carnot efficiency.
b. can be improved by lowering the temperature of the cool reservoir.
c. can be improved by raising the temperature of the hot reservoir.
d. all of the above
d
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Four equal negative point charges are located at the corners of a square, their positions in the xy-plane being (1,1), (?1,1), (?1,?1), (1,?1). The electric field on the x-axis at (1,0) points in the same direction as
A) i^ B) j^ C) -i^ D) -j^
The total kinetic energy in one mole of an ideal gas is 4,000 J. What is the average kinetic energy of an individual particle in the ideal gas?
a. 
b. 
c. 
d. 
e. 
Clocks on a spaceship moving at high speed relative to the Earth run more slowly when viewed from
A) within the spaceship. B) Earth. C) both of these D) neither of these
Stars A and B are both black holes but have different masses. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to the average density of star B will be
A) the same. B) four times as much. C) one-fourth as much. D) half as much. E) twice as much.