The big bang is thought to have occurred about
A) 14 trillion years ago.
B) 14 million years ago.
C) 5000 years ago.
D) a million years ago.
E) 14 billion years ago.
E
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We suspect that quasars are the active centers of galaxies because
a. "fuzz" around the central luminous regions produces spectra like a collection of normal stars.. b. a few quasars have large red shifts. c. the central regions of some quasars fluctuate rapidly. d. all of the above e. none of the above
Two people stand on different floors of an outdoor stairway. One is 6 m above the ground and the other is 12 m above the ground. The person on the lower floor throws a ball upward with a speed of 15 m/s and the other person just drops hers. Ignoring air resistance, which ball hits the ground at a higher speed?
A. The one thrown upward B. They both hit the ground with the same speed C. The one that is dropped
Is an activation energy required to obtain the reaction in studied in this experiment?
What is the Kuiper Belt?
A. an enormous aggregate of gas and dust from which the Solar System was formed B. a large belt containing asteroids in a gap between the orbits of Mars and Jupiter C. a swarm of comet nuclei in a huge shell surrounding the Sun and planets D. a disklike swarm of icy objects that lies from near the orbit of Neptune to past Pluto's orbit