In the distant past, the temperature of the universe was
A) hotter than it is today.
B) cooler than it is today.
C) absolute zero (0 K).
D) 3 K.
A) hotter than it is today.
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Aluminum-lithium alloys were developed for aircraft applications because of their relatively high yield strength and low _________.
Fill in the blank(s) with the appropriate word(s).
What is the activation energy of a chemical reaction if the reaction rate triples when the temperature goes from 10
to 30
?
a. 
b. 
c. 
d. 
e. 
According to models of galaxy formation, which population of stars formed first?
A.) The spheroidal population. B.) The disk population. C.) The irregular population. D.) The elliptical population. E.) All stars are about the same age.
Compared to the distance between Earth and Mars, the distance between Jupiter and Saturn is
A) much larger. B) about the same. C) much smaller. D) just slightly less.