Besides mass the other factor that influences where a star appears on the main sequence is:
A) distance from Earth.
B) number of stars in the cluster.
C) chemical composition of the cloud.
D) the motion of the star.
E) the type of cluster the star is formed in.
C
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The protons and neutrons that make up normal matter belong to a family of subatomic particles called _____
A) embryons B) tachyons C) rayons D) baryons
A car hits another and the two bumpers lock together during the collision. Is this an elastic or inelastic collision?
A) elastic B) inelastic C) insufficient information (It could be either.)
Freely falling bodies experience
a. motion with constant velocity. b. motion with zero acceleration. c. motion with constant acceleration. d. motion at a constant speed. e. none of the above
Two cars are traveling at the same speed and hit the brakes at the same time. Car A decelerates (decreases its velocity) at twice the rate of car B. If car B takes time T to stop, how long does it take car A to stop?
A) 4T B) 2T C) T D) T /2 E) T/4