Two strings both vibrate at exactly 819 Hz. The tension in one of them is then increased slightly. As a result, six beats per second are heard when both strings vibrate. What is the new frequency of the string that was tightened?
A) 825 Hz
B) 813 Hz
C) 822 Hz
D) 816 Hz
A
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___________ of the Milky Way contains mostly old (population II) stars and globular clusters
a. The disk component b. The spherical halo component c. The hydrogen gas in the disk d. The spiral arms e. Sgr A
At the very small-scale level, matter is
A) nearly at rest. B) subject only to the strong nuclear force. C) really made of tiny pieces of pizza. D) in rapid motion. E) very cold.
In a system with two moving objects, when a collision occurs between the objects:
a. the total kinetic energy is always conserved. b. the total momentum is always conserved. c. the total kinetic energy and total momentum are always conserved. d. neither the kinetic energy nor the momentum is conserved.
The atmosphere becomes opaque to infrared radiation when it
A) increases in temperature. B) contains excess water vapor and carbon dioxide. C) radiates high-frequency radiation. D) none of the above