Craters on the Moon are believed to have been caused by
a. wind erosion.
b. water erosion.
c. the impact of meteorites.
d. volcanic action.
c
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An atom with 6 protons and 6 neutrons is a carbon atom, and an atom with 6 protons and 7 neutrons is also a carbon atom.
Answer the following statement true (T) or false (F)
Which of the following makes it very difficult to detect planets around other stars?
A) Planets are constantly orbiting their stars, so we don't know where to point our telescopes to see them. B) Planets are typically at least a billion times fainter than their host stars. C) Planets give off only infrared light, not visible light. D) Planets orbit too far from their stars to be detected.
Electric generating plants are usually rated in "megawatts". This is a unit of
A) force. B) power. C) energy. D) both energy and work. E) work.
The energy released from a nuclear reaction is equal to:
a. energy associated with momentum conservation. b. the exothermic endothermy. c. energy associated with the change in mass. d. the total charge involved.