A metallic object holds a charge of -2.9 × 10^-5 C. What total number of electrons does this represent? (e = 1.6 × 10^-19 C is the magnitude of the electronic charge.)
a. 1.8 × 10^14
c. 6.1 × 10^13
b. 2.4 × 10^13
d. 4.2 × 10^14
A
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A. zero. B. upward. C. toward the north. D. toward the south. E. downward.
The three common phases of matter on earth are ________, ___________, and _______
Fill in the blank(s) with correct word
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two second time. The acceleration of the ball in m/s2 is
a. 0 d. 6 b. 4.9 e. none of these c. 9.8
In the simplified Drake equation, a value of flife = 1 would imply that
A) there is one other habitable planet in the galaxy B) all habitable planets in the galaxy have life C) there is one other habitable planet in the galaxy with life on it now D) all habitable planets in the galaxy have life on them now