Astronomers think most galaxy interactions took place at redshifts of greater than 1 because:
A) stars were bigger.
B) galaxies were bigger.
C) galaxies were smaller.
D) clusters were more diffuse.
E) clusters were more compact.
E
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Phase changes occur
A) as the temperature decreases. B) as the temperature increases. C) as the temperature remains the same. D) all of the above E) none of the above
Which one of the following numbers is the correct magnification produced by a plane mirror?
A) 1/4 B) 1 C) 2 D) 3/2 E) 1/2
Shown that (a) Eb?/T 5 = f(?T) only. For ?T = 5000 ?m K, calculate Eb?/T 5.
GIVEN • ?T = 5000 ?m K = 0.005 m K FIND Shown that (a) Eb? /T 6 = f(?T) (b) Calculate E b? /T 5 for the ?T given
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is
A) greater with the haystack. B) greater with the brick wall. C) both the same