The proper interpretation of the Hubble law (which relates the redshift of a galaxy to its distance) is that as time goes on, galaxies are____
a. staying relatively still in space while the space between the galaxies contracts
b. moving away from a common center in space that is neither expanding nor contracting
c. staying relatively still in space while the space between the galaxies expands
d. moving away from a common center while the space between the galaxies expands
e. moving toward a common center in space that is neither expanding nor contracting
c
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If you double the radius of a sphere, its volume increases by what factor?
A. 2 B. 4 C. 6 D. 8
A basketball player jumps to make a basket, and remains in the air for a moment. A sportscaster, talking about the game, then remarks that she has "defied gravity." Which of the following accurately describes the situation?
A) The player did stay in the air in spite of the Law of Gravitation, but a single counter-observation is not enough to warrant revisiting a theory that usually works. B) The player produced enough force with her legs to accelerate up into the air, and gravity brought her back down with an acceleration of 9.8 m/s2. C) The player only seemed to defy gravity, but part of the Universal Law of Gravitation makes an exception for basketball players. D) The player has defied gravity, so scientists must go back into the lab to refine their theory.
The coldest region of the atmosphere is the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
A compound resulting from a major fuel impurity is
a. CO2. b. CO. c. SO2. d. HC.