Conservation of angular momentum means that a spinning body tends to
A) fly apart.
B) slow down.
C) wobble into an eccentric orbit.
D) gravitationally collapse.
E) keep spinning.
E
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Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit. B) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt. C) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit. D) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists.
Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take for a sample of americium to lose one-third of its nuclei?
A) 2960 s B) 10.6 × 103 years C) 4.32 × 103 years D) 6.44 × 103 years E) 7.84 × 103 years
The Q value for the following reaction, , is (in MeV) m(alpha) = 4.002 603 u m(Be) = 9.012 182 u m(n) = 1.008 665 u m(C) = 12.000 00 u 1 u = 1.66 × 10^?27 kg
a. 8.4 b. 6.2 c. 7.3 d. 5.7 e. 3.5