When a massive star begins to run out of hydrogen to fuse, its outer layers of gas ________.
A. expand and cool
B. contract and heat
C. contract and cool
D. expand and heat
Answer: A
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Isotopes of an element have the same number of ________ but different numbers of _______.
A. neutrons, protons B. electrons, protons C. protons, neutrons D. neutrons, electrons E. protons, electrons
Capacitance: What charge accumulates on the plates of a 2.0-?F air-filled capacitor when it is charged until the potential difference across its plates is 100 V?
A. 50 ?C B. 100 ?C C. 150 ?C D. 200 ?C
When boarding an airplane you bring a bag of chips. While in flight the bag puffs up, because
A) air pressure in the air-tight bag is greater than cabin air pressure. B) suction is occurring. C) air pressure is affected by the Bernoulli principle. D) all the above E) none of the above
Heat Engines: A nuclear power plant has an actual efficiency of 33%. If 0.19 MW of energy are released from fission, how much electric power does the power plant produce?
A. 0.063 MW B. 6.3 MW C. 25 MW D. 0.25 MW