A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally before striking the water? (use g = 10 m/s2)
A) 14 m
B) 24 m
C) 20 m
D) 16 m
E) 12 m
C
Physics & Space Science
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The net force on a moving object suddenly becomes zero. The object then
A. stops abruptly. B. stops during a short time interval. C. changes direction. D. continues at constant velocity. E. slows down gradually.
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In about 14,000 AD, the North Pole of Earth will point at star ________.
A. Antares B. Vega C. Thuban D. Polaris
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The core of a protostar that will eventually become a brown dwarf shrinks until
A) the type of pressure called degeneracy pressure becomes important. B) its central temperature is high enough to support fusion reactions. C) it forms a rocky core. D) it radiates brown light.
Physics & Space Science
The ______________ occurs on June 21
a. autumnal equinox b. winter solstice c. summer solstice d. vernal equinox
Physics & Space Science