A 15-mF capacitor is charged to 40 V and then connected across an initially uncharged 25-mF capacitor. What is the final potential difference across the 25-mF capacitor?
a. 12 V
b. 18 V
c. 15 V
d. 21 V
e. 24 V
C
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A chemical combination of two or more substances in variable proportions is called
a. a mixture. b. a compound. c. an ion. d. a molecule.
Seven seconds after a brilliant flash of lightning, thunder shakes the house. How far was the lightning strike from the house?
A) Much closer than one kilometer B) About one kilometer away C) About two kilometers away D) Much farther away than two kilometers E) It is impossible to predict.
Light travels for about ________ to reach the Sun's surface from the Sun's core, and about ________ to reach Earth from the Sun's surface.
A. 1 minute; 8 seconds B. 100 years; 8 minutes C. 100 years; 8 seconds D. 16 million years; 8 minutes
Spectra of the Martian surface taken from orbiting spacecraft have detected the presence of which of the following minerals that form in water?
A) hydrated clays, sulfates and silicates B) limestones C) zircons D) sea and rock salts