If an electric charge is shaken up and down,
A) sound is emitted.
B) light is emitted.
C) electron excitation occurs.
D) a magnetic field is created.
E) its mass decreases.
D
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The maximum acceleration of a car while towing a second car twice its mass, compared to no towing, is
A) one-half. B) one-third. C) one-fourth. D) the same. E) none of the above
What are two reasons that Earth lost its first atmosphere of hydrogen and helium? What will be an ideal response?
During a spring flood, a small lake receives a large influx of nutrients. We would expect that in this lake, the growth of phytoplankton will
A) decrease and the growth of submerged aquatic vegetation will decrease. B) decrease and the growth of submerged aquatic vegetation will increase. C) increase and the growth of submerged aquatic vegetation will decrease. D) increase and the growth of submerged aquatic vegetation will increase.
Greenhouse gases include all of the following except ____
a. argon b. methane c. nitrogen oxides d. carbon dioxide e. hydrofluorocarbons