Proper motion of a star is measured in meters
Indicate whether the statement is true or false
False
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A comet’s plasma tail always points directly away from the Sun because __________.
a. of pressure exerted by the fast-moving charged particles in the solar wind b. centrifugal forces throw the tail outward as the comet travels around the Sun c. the comet’s nucleus overheats on the Sun-facing side, forcing energetic jets of gas to shoot out from the dark side d. the tail is left behind as the comet moves through its orbit
A bass fiddle is louder than a harp because of its
A) thicker strings. B) sounding board. C) lower pitch. D) all of the above E) none of the above
An iron specimen
A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling away from the factory at 30 m/s? The speed of sound in air is 343 m/s
A) 73 Hz B) 75 Hz C) 77 Hz D) 79 Hz E) 81 Hz