If the Earth rotated much more slowly, which of the following would be a consequence of that?
A) Seasons would be more extreme.
B) Days would get hotter and nights would get colder.
C) Days would be shorter.
D) Seasons would last longer.
B
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How do we know that different colors of light have different speeds in a material?
a. Because of measurements by Galileo of the speed of different colors of light. b. Because different colors reflect at different angles. c. Because the index of refraction depends on the speed of light in a material, and that index is different for different colors. d. Because Fizeau's measurements measured different colors of light to have different speeds. e. Because the colors combine to form white light.
Distinguish between a solar eclipse and a lunar eclipse, and the reasons for each
What will be an ideal response?
Standing Sound Waves: One of the harmonics of a column of air in a tube that is open at one end and closed at the other has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. How long is the tube? The speed of sound in air is 343 m/s.
A. 1.34 m B. 0.670 m C. 0.335 m D. 1.00 m E. 2.68 m
A skydiver's terminal velocity will be greatest if she falls
A) head first. B) lying flat on her back. C) lying flat on her stomach. D) with her parachute open.