A region of expanding air tends to
A) cool.
B) warm.
C) both of the these
D) neither of these
Answer: A
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In the early universe, the electromagnetic and strong nuclear forces were joined together to make the electrostrong force
a. True b. False Indicate whether the statement is true or false
On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie:
A) at the top left. B) at the top right. C) close to the Sun, near the center. D) at the lower left. E) at the lower right.
The nova event is created by the helium flash
Indicate whether the statement is true or false
If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:
a. at rest. c. being accelerated. b. moving with a constant velocity. d. losing mass.