A freely falling object
a. has a uniformly increasing velocity.
b. is unaffected by gravity.
c. has a uniformly increasing acceleration.
d. has a uniformly increasing displacement.
a
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All but the most inactive metals react with acids to give
a. hydrogen and the metal salt. b. hydrogen and the metal hydroxide. c. hydrogen and the metal oxide. d. oxygen and the metal hydride.
Ancient coal beds can be found in Antarctica because
A) at one time the climate of Antarctica was mild enough to support swamplands. B) ancient coal beds were frozen in the Antarctic ice. C) it used to be located in the northern hemisphere. D) it was located at the equator during the Carboniferous period.
The least massive main-sequence stars have a/an _____ luminosity class and a/an _____ spectral class
Fill in the blank(s) with correct word
A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 38 cm and 0.40 cm, respectively. What is the angular magnification of this instrument?
a. 95 c. 27 b. 50 d. 19.6