After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations: Electrons moving upward feel a magnetic force in the
northwest direction. Electrons moving horizontally toward the north are pushed downward. Electrons moving horizontally toward the southeast are pushed upward. Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction? A) toward the east
B) toward the northeast
C) toward the southwest
D) toward the southeast
E) toward the west
C
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How much of Earth’s land surface is still covered with wilderness?
A. 39% B. 49% C. 59% D. 79%
Describe the temperature change in the transition zone
What will be an ideal response?
The quantity is known as
a. kinetic energy. b. potential energy. c. work. d. energy. e. power.
Suppose that an object’s entropy increases from zero when its thermal energy is U = 0 to some maximum value when U = 
Umax, and then goes back to zero when U = Umax (as shown in the drawing below). The greatest thermal energy U that such an object could have when in thermal equilibrium with a normal object is closest to which of the following?
A. 0
B. 
Umax
C. 
Umax
D. 
Umax
E. Umax
F. Other (specify)