What makes up the bulk of the atmosphere of Venus?
a. hydrogen
b. carbon dioxide
c. argon
d. water vapor
e. sulfuric acid
b
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Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by a process called the _____
A) proton-proton chain B) carbon-nitrogen-oxygen cycle C) zero-age main sequence D) proton-neutron chain
The equivalence principle can be best illustrated by ____
a. a person riding in an elevator b. a rocket coasting through space at a constant velocity c. the change in mass of a moving body d. the formation of energy by nuclear fusion e. a car ride on a highway with the windows open
The force due to gravity between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does G represent?
A) the distance between the two objects B) the universal gravitational constant C) the density of the smaller object
Are the laws of energy [conservation of energy, and 2nd law of thermodynamics] known for certain to be true?
A) No; in fact these laws are known to be violated at sufficiently high speeds, small distances, and large distance. B) No, because all scientific laws are tentative. C) No, for both of the above reasons. D) Yes, because despite repeated checking they have never been found to be false. E) Yes because, unlike some of the other laws, these laws are true by logical deduction from a priori premises.