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

Physics & Space Science

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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

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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

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Is an activation energy required to obtain the reaction in studied in this experiment?

Physics & Space Science

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

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