An automobile travels due north with a speed of 77 km/h that is decreasing. All forces considered, the unbalanced force acting on the auto is
a. zero.
b. southward.
c. northward.
d. downward.
e. upward.
b
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Which factor(s) in the Drake equation (Number of Civilizations = NHP × flife × fcivilization × fnow) can we estimate based on discoveries of extrasolar planets?
A) NHP B) flife C) fcivilization D) fnow E) all of the above
Suppose you launch two probes in opposite directions from the Space Station and they meet as they orbit Earth. According to general relativity, why does this happen?
A) They are following the straightest possible paths through spacetime, and those paths curve so that the probes meet. B) They are following the allowed orbits according to Newton's universal law of gravitation. C) The force of gravity tugs on the probes and forces them to orbit the Earth. D) Objects launched in space always follow circular paths, no matter where they are.
The objectives of two astronomical telescopes have the same focal length but one objective has double the diameter of the other. An advantage of the telescope with the larger objective is
A) its higher power. B) its greater aberration. C) its higher price. D) its brighter image. E) its lower aberration.
Which of the following is true of the Ptolemaic model of the Universe?
A) It predicted the positions of the planets with fair accuracy at first. B) It went against Aristotle's beliefs of the Universe. C) It strengthened the first principles of Aristotle. D) It placed Earth at the exact center of the Universe.