Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes
What magnitude force does the 5.0-kg box exert on the 3.0-kg box? A) 0 N
B) 10 N
C) 25 N
D) 40 N
E) 50 N
C
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A 10-solar-mass star is about ten times more luminous than a 1-solar-mass star
Indicate whether the statement is true or false
The most important fact about a cluster of stars that makes them useful for studying star formation is that
A) all the stars formed from the same cloud. B) all the stars formed at about the same time. C) all the stars are at the same distance from Earth. D) all the stars have the same chemical composition. E) all the stars are the same spectral type.
If you wanted to observe stars behind a molecular cloud, in what wavelength of light would you most likely observe?
A) ultraviolet B) visible C) infrared D) X-ray E) gamma-ray
For every star with a mass greater than 10 solar masses, about how many stars are there with masses less than a solar mass?
A) 1 B) 3 C) 10 D) 30 E) 200