Scientists are able to use the theories of physics to describe the conditions of the universe back to:
A) the moment of the Big Bang.
B) the end of the Planck Epoch.
C) the beginning of GUT.
D) the end of the Radiation Era.
E) the Recombination Epoch.
B
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Molecular Speeds: Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving
A. four times faster than the hydrogen molecules.
B. at 1/4 the speed of the hydrogen molecules.
C. sixteen times faster than the hydrogen molecules.
D. at 1/16 the speed of the hydrogen molecules.
E. at 1/
the speed of the hydrogen molecules.
Time Dilation: You are a passenger on a spaceship. As the speed of the spaceship increases, you will observe
A. your watch slowing down. B. your watch speeding up. C. your watch losing time. D. your watch gaining time. E. nothing unusual about the behavior of your watch.
The ideal shape for the primary mirror of a telescope is
a. concave circular. b. convex circular. c. concave parabolic. d. convex parabolic. e. plane.
The force exerted on a current-carrying wire located in an external magnetic field is directly proportional to which of the following?
a. current strength b. field strength c. both A and B d. None of the above are valid.