The process and result of a star's evolution off of the main sequence are determined primarily by the star's mass
a. True
b. False
Indicate whether the statement is true or false
True
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Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. Why are elements with even numbers of protons more abundant, on average, than elements with odd numbers of protons?
A) because elements are mainly made in reactions with helium nuclei B) Because when elements split in a fission reaction, they prefer to split with all the protons paired. C) There's no explanation, it's something of a mystery to be explained, or it may be a coincidence. D) because elements are mainly made in reactions with hydrogen nuclei
Within cosmology, the critical density is
A. the density that determines whether the Universe expands forever or recollapses. B. the density of the Universe. C. the density of the most massive black hole in the Universe. D. the density of Universes in the multiverse. E. None of these choices is correct.
Radiative energy is
A) heat energy. B) energy from nuclear power plants. C) energy carried by light. D) energy of motion.
A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three are released simultaneously at the top of an inclined plane, and roll without slipping which will reach the bottom first?
A) sphere B) pipe C) cylinder D) they all reach bottom in the same time E) It depends on the angle of inclination.