In a hydrogen atom, a given electron has ? = 7. How many values can m? have?
A)
6
B)
7
C)
15
D)
33
E)
98
C
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Two charges are separated by a certain distance. If the magnitude of each charge is doubled the force on each charge is
a. halved. b. doubled. c. tripled. d. quadrupled.
Venus may have started with an ocean's worth of water. Where is its water now?
A) The original water remains vaporized in the atmosphere due to Venus's intense heat. B) Most of the water is frozen beneath the surface. C) Most of the water combined with rocks in chemical reactions. D) The water was lost when ultraviolet light broke apart water molecules and the hydrogen escaped to space. E) The water changed to carbon dioxide through chemical reactions.
Which of the following statements about the greenhouse effect is true?
A) The burning of fossil fuels increases the greenhouse effect on Earth because of the release of carbon dioxide. B) A weak greenhouse effect operates on Mars. C) Without the naturally occurring greenhouse effect, Earth would be too cold to have liquid oceans. D) One result of an increased greenhouse effect on Earth may be an increased number of severe storms. E) All of the above are true.
The force of a boxer's punch is greater when it hits a
A) small punching bag. B) heavy punching bag. C) both forces would be the same for the same effort