The halo in the spherical component of the Milky Way contains about _____ as many stars as the disk of the galaxy
A) 2 percent
B) 6 percent
C) 10 percent
D) 14 percent
A
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The diameter of a nitrogen molecule is about 0.29 nm. In a tank of nitrogen at a pressure of 2.5 atm and temperature 273 K, what is the mean free path of a nitrogen molecule?
A. 39 nm B. 56 nm C. 177 nm D. 125 nm
When was Pluto discovered?
What will be an ideal response?
The air that you breathe doesn't emit visible light indicates that most of the electrons of its atoms are
A) in the ground state. B) excited to metastable states. C) relatively cool. D) electrically neutral. E) relatively far apart.
In a perfectly elastic collision, a 400-g ball moving toward the east at 3.7 m/s suddenly collides head-on with a 200 g ball sitting at rest
(a) Determine the velocity of the first ball just after the collision. (b) Determine the velocity of the second ball just after the collision. (c) Is kinetic energy conserved in this collision? How do you know?