Most stars in our part of the Galaxy are formed
A) in a singular event just after the Big Bang.
B) alone.
C) in open clusters of a few dozen.
D) in associations of thousands of stars across a spiral arm of the Galaxy.
E) in globular clusters of millions of stars.
C
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Copernicus
a. proposed that the Earth orbited the Sun. b. showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun. c. neither proposed that the Earth orbited the Sun and showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun. d. both proposed that the Earth orbited the Sun and showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun.
Molar Specific Heats: A certain ideal gas has a molar specific heat at constant pressure of 7R/2. What is its molar specific heat at constant volume?
A. 5R/2 B. 3R/2 C. 8R D. 9R/2 E. 6R
How many times more intense is an 80. db sound than a 60. db sound?
A) 10 B) 20 C) 2.0 D) 1.33 E) 100
When you interchange your emitter for one with a smaller work function, you measure