Wobbles in the path of Uranus led to the discovery of
A) Jupiter.
B) Mars.
C) Neptune.
D) all of the above
E) none of the above
Answer: C
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A new Moon appears in the sky just before the time of a
A) solar eclipse. B) lunar eclipse. C) both of these D) neither of these
Shapley found the globular clusters were strongly concentrated toward Sagittarius
Indicate whether the statement is true or false
Two adjacent sources each emit a frequency of 800. Hz in air where the velocity of sound is 340. m/s. How much farther back would the first source have to be moved so an observer in front of the sources would hear no sound?
What will be an ideal response?
Waves on a String: A wire that is 1.0 m long with a mass of 90 g is under a tension of 710 N. When a transverse wave travels on the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the frequency of this wave?
A. 890 Hz B. 920 Hz C. 1000 Hz D. 1200 Hz E. 1500 Hz