A(n) ____ is a collection of 100 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young
a. Herbig Haro object
b. globular cluster
c. open cluster
d. giant cluster
e. supernova
C
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Heating the air in a hot air balloon reduces the air's _________
Fill in the blank(s) with correct word
In a series circuit consisting of a 12.0 emf, a 2.00 mF capacitor, a 1.00 k
resistor and a switch, what is the voltage across the capacitor at a time 
after the switch is closed?
A. .632 V B. 6.32 V C. 7.58 V D. 8.65 V
The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a hundred years ago. B) a thousand years ago. C) tens of thousands of years ago. D) hundreds of thousands of years ago. E) a million years ago.
Using Maxwell's equations it can be shown that electromagnetic waves have a speed in free space of
A) (?O?O)-3/2. B) (?O?O)-1/2. C) ?O?O. D) (?O?O)-2. E) (?O?O)-1.