A gas heated to millions of degrees would emit
A) mostly radio waves.
B) mostly X-rays.
C) no light, because it is too hot.
D) mostly ultraviolet light.
E) an equal amount of all wavelengths of light.
B
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A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
A) g downward B) 0.5g downward C) 2g downward D) g upward E) 2g upward
What is the symbol for a neutrino?
a. n b. c. d. none of the above
A lunar eclipse that occurs when the Moon moves completely into Earth's umbral shadow is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular eclipse. d. a penumbral lunar eclipse. e. a total lunar eclipse.
Astronomers have discovered more extrasolar planets around other stars than the number of planets in our own Solar System
Indicate whether the statement is true or false