You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is
a. 85 m
b. 170 m
c. 340 m
d. 680 m
e. none of the above
C
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Which statement about the rotation of the Inner planets is true?
a) Venus rotates in the opposite direction from the three others. b) All rotate in the same direction. c) The rotation periods of all of them are the same, i.e. 1 Earth day. d) All have rotation periods of 365 Earth days. e) All have rotation periods about equal to their periods to orbit the Sun.
The rotation periods of Venus, Jupiter, Saturn, Uranus and Neptune are difficult to determine because:
A) they rotate so fast. B) they are all gas giants. C) they are so far away from the Sun. D) their surface features are obscured by their atmospheres. E) each one has a large satellite that interferes with this measurement.
The property of response to the environment appears to be
A) a necessary condition, but not a sufficient condition for life B) a sufficient condition, but not a necessary condition for life C) both a necessary condition and a sufficient condition for life D) neither a necessary condition nor a sufficient condition for life
Relative distribution of charge density on the surface of a conducting solid depends on the
a. shape of the conductor. b. mass density of the conductor. c. type of metal of which the conductor is made. d. strength of the earth's gravitational field.