What is the quantum number n of a particle of mass m confined to a one-dimensional box of length L when its momentum is 4h/L?
a. 1
b. 4
c. 2
d. 8
e. 16
D
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A circular conducting loop falls toward a bar magnet, as shown in the diagram below. 
In which direction does current flow in the loop?
A. Clockwise (when viewed from above). B. Counterclockwise (when viewed from above). C. No current flows in this loop. D. We need more information to answer.
Potential Energy: Point charges +4.00 ?C and +2.00 ?C are placed at the opposite corners of a rectangle as shown in the figure. If these charges are released and are free to move with no friction, what is the maximum amount of kinetic energy they will gain? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
Fill in the blank(s) with the appropriate word(s).
A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct?
A) The total momentum both before and after the collision is 24 kg ? m/s. B) The total momentum before the collision is 24 kg ? m/s, and after the collision is 0 kg ? m/s. C) The total momentum before the collision is 0 kg ? m/s, and after the collision is 24 kg ? m/s. D) The total momentum both before and after the collision is zero. E) None of the above is true.
Negative work can be done
a. by friction on the tires while a car is accelerating without skidding. b. by a spring at the bottom of an elevator shaft when it stops a falling elevator. c. by a hand catching a ball. d. by all of the above. e. only by (b) and (c) above.