Which of the following would make finding life in an ocean beneath the surface of Ganymede more difficult than finding life in an ocean beneath the surface of Europa?
A) a thicker ice layer above the ocean
B) the presence of high-density forms ice at the bottom of any ocean
C) fewer nutrients transported down from the surface
D) all of these
D
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A _____ is an electronic device consisting of a large array of light-sensitive elements used to record very faint images
A) photometer B) charge-coupled device C) spectrograph D) photographic plate
A baseball is pitched, reaching the batter with a speed of 37 m/s and is hit such that it returns on the same line at 48 m/s. If the ball was in contact with the bat for 0.22 seconds, what was the average acceleration experienced by the ball during the time of contact?
A. 220 
B. 41
C. 390
D. 170
If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = 80 nC, and q = 24 nC in the figure, what is the magnitude of the electric force on q?
a.
2.7 N
b.
1.9 N
c.
2.3 N
d.
1.5 N
e.
0.52 N
How are the particles in the elementary particle zoo classified in order to relate them effectively?
a. By particle size. b. By charge. c. By which force the particles participate in. d. By mass. e. By location.