The Harvard College Observatory Computers from c. 1880 into the early 20th century were:
A) the first digital computers.
B) not much different than cash registers.
C) functionally similar to the modern 4- function calculator.
D) a group of women who made important contributions to astronomy.
E) mechanically operated adding machines.
D
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An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the observer is stationary, what is the frequency of the siren perceived by the observer?
A. 2,032 Hz B. 2,150 Hz C. 2,220 Hz D. 2,575 Hz E. 2,750 Hz
Two sound waves traveling through the air have different frequencies. Consequently, they must also have different
a. amplitudes. b. speeds. c. wavelengths. d. all of the above
Stars form from a collapsing cloud that fragments into smaller and smaller pieces. This process takes about:
A) 10,000 years. B) 25,000 years. C) 100,000 years. D) a few million years. E) 100 million years.
Movement of air aloft can influence surface air pressure; sometimes air aloft spreads apart—it diverges—decreasing the mass of air above the surface. This causes the surface air pressure to
A) increase and surface winds to blow inward toward the center of highest pressure. B) decrease and surface winds to blow inward toward the center of high pressure. C) increase and surface winds to blow inward toward the center of low pressure. D) decrease and surface winds to blow inward toward the center of lowest pressure.