The burning of one gallon of gasoline releases about 
If each nuclear fission reaction in a nuclear power plant releases 
what quantity of Uranium-235 is used to produce the same amount of energy relased in burning a gallon of gasoline?
A. 28g
B. 0.28g
C. 2.8g
D. 0.0028g
C. 2.8g
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Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes significantly dimmer for about 2 hours. The most likely explanation is that
A) the star is a member of an eclipsing binary star system. B) the star is a Cepheid variable. C) the star is periodically ejecting gas into space, every 73 hours. D) the star is a white dwarf.
The SI base units making up the newton are
a. kg m/s. b. g m/s2. c. kg m/s2. d. kg2/s.
At which of these Kelvin temperatures would a blackbody radiate mostly at visible wavelengths?
A) 6 K B) 60 K C) 600 K D) 6000 K E) None of these; a blackbody doesn't radiate visible light.
A white dwarf is
A) what most stars become when they die. B) a precursor to a black hole. C) an early stage of a neutron star. D) a brown dwarf that has exhausted its fuel for nuclear fusion.