A car moving at 36 m/s passes a stationary police car whose siren has a frequency of 500 hz. What is the change in the frequency (in Hz) heard by an observer in the moving car as he passes the police car? (The speed of sound in air is 343 m/s.)
a. 416
b. 208
c. 105
d. 52
e. 552
C
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Evidence for a permafrost layer of ice just a few meters below the surface of Mars include:
A) outflow channels and ancient river deltas. B) "hydrated" chemical compounds found on surface rocks. C) carbonate rock layers that are in low abundance. D) "fluidized ejecta" craters. E) river channels and flood plains that look identical to such features on Earth.
A certain radio wave has a wavelength of 6.0 × 10^-2m. What is its frequency in hertz?
The most common kinds of stars are low-luminosity stars
a. True b. False Indicate whether the statement is true or false
One ancient Greek scientist, Aristarchus, had a theory about the layout of the universe that was quite different from the other Greek theories. According to Aristarchus's theory,
A) Earth is at the center and other objects move around Earth in simple circles. B) the sun is at the center and other objects, including Earth, move around the sun in simple circles. C) Earth is at the center, and the planets move around Earth in orbits that could be described as "circles-within-circles" or "loop-the-loops." D) the Earth is held up by Hercules, who stands on a turtle, who stands on an elephant, who stands on Zeus, who is beginning to think that the whole thing isn't worth the effort. E) there is no fixed center anywhere in the universe.