You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide and 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time.
b. the same distance up as before, but take a longer time.
c. a smaller distance up, but take a shorter time.
d. a greater distance up, but take a longer time.
e. a greater distance up, but take the same time.
d
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Molecular Speeds: The root-mean-square speed of the molecules of an ideal gas is v. The gas is now slowly compressed to one-half its original volume with no change in temperature. What is the root-mean-square speed of the molecules now?
A. 4v
B. 2v
C. v/
D. v
E. v/2
In what manner have astronomers and physicists made tests to confirm that Einstein's theory of general relativity is actually a proper description of gravitational phenomena?
What will be an ideal response?
The lunar highlands are:
A) more rugged, heavily cratered, and older than the lunar mare. B) made of lighter colored, younger rocks than the mare. C) formed by plate tectonics, like the Earth's Himalayas. D) formed by volcanic eruptions, much like our Andes. E) brighter than the mare, since they are covered with reflective glass from the rays.
What source of energy might keep an ocean beneath the surface of Callisto liquid?
A) tidal heating only B) radioactive decay only C) tidal heating and radioactive decay D) heat released from a partially molten core