A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
A. 17 m
B. 21 m
C. 18 m
D. 27 m
E. 31 m
Answer: A
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A. points upward. B. points downward. C. points toward you. D. points away from you. E. is zero.
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The results of this experiment were that no amino acids or DNA were formed, but complex organic molecules were observed. The purpose of this experiment was to determine whether: A) DNA could form from amino acids. B) DNA could form from ultraviolet radiation. C) ultraviolet radiation could create amino acids. D) amino acids could form in the harsh vacuum of outer space. E) amino acids cold form from water, methanol, ammonia and carbon monoxide.
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A. 36 N/C B. 29 N/C C. 43 N/C D. 50 N/C E. 58 N/C
What is the equivalent resistance between points a and b when R = 12 ??
A. 20 ? B. 16 ? C. 24 ? D. 28 ? E. 6.0 ?