Twenty milliseconds is
a. 0.00002 s
b. 0.0002 s
c. 0.002 s
d. 0.02 s
e. 20000 s
D
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The entropy of the universe
A. is always decreasing B. is conserved C. is impossible to calculate D. can only increase or remain constant
How do stars on the main sequence obtain their energy?
A) from chemical reactions B) from gravitational contraction C) by converting hydrogen to helium in their cores D) by converting helium to carbon, nitrogen, and oxygen E) from nuclear fission
Objects which have contracted, but are of too little mass to establish thermonuclear reactions in their cores, are ________, which slowly continue to cool
Fill in the blank(s) with correct word
Components: The components of vectors 
and 
are given as follows: Bx = -9.2 Cx = -4.5 By = -6.1 Cy = 4.3The angle (less than 180°) between vectors 
and 
is closest to
A. 77°. B. 103°. C. 10°. D. 170°. E. 84°.