Work Done by a Gas: A gas expands at constant temperature from an initial volume of 0.040 m3 and an initial pressure of 210 kPa until its pressure drops to 135 kPa. How much work is done by the gas during this expansion? (R = 8.31 J/mol ? K)
A. 3.0 kJ
B. 3.7 kJ
C. 4.1 kJ
D. 5.6 kJ
E. 7.9 kJ
Answer: B
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at point b? 
A. ?0 I/4?R B. ?0 I/2?R C. ?0 I/?R D. ?0 I/R E. (2 + ?)?0 I/4?R F. Zero
A conservative force on a particle moving along the x axis is given by 
. Which of the following is a potential that is associated with this force?
A.
B.
C.
D.
E.
A raindrop is doing its part to form a primary rainbow. Red and blue light enter near the top of the raindrop together from the sun. Both red and blue are reflected once at the back surface of the drop, but when the two rays emerge on the sunward side
A. the red ray lies above the blue ray and is more nearly horizontal than the blue ray. B. the blue ray lies above the red ray and is more nearly horizontal than the red ray. C. the blue ray lies below the yellow ray and is more nearly horizontal than the yellow ray. D. None of these choices are correct
Which of the following is not produced by plate tectonics?
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