A piece of plastic has a net charge of +2.00 ?C. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10-19 C)
A) 1.25 × 1013
B) 1.25 × 1019
C) 2.50 × 1013
D) 2.50 × 1019
Answer: A
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The angular size of your fist, held at arm’s length, is about
a. 1 degree. b. 10 degrees. c. 12.7 centimeters. d. 25.4 centimeters.
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The Drake equation calculates N. What is N?
A) the number of intelligences in the entire universe B) the number of technical civilizations in our galaxy presently C) the number of stars with habitable planets D) the number of planets with life in the universe E) the number of planets in just our galaxy
Compared to the planets in our own solar system, exoplanets have
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