A 12 mF capacitor is connected in series with a 4 mF capacitor, the combination being connected across a 6 V power supply. The charge on the 12 mF capacitor is
A) 24 mC.
B) 12 mC.
C) 18 mC.
D) 72 mC.
E) 36 mC.
C
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Motion of the plates of Earth's crust is thought to be due to
a. the solar wind. b. convection from the hot interior. c. tides in the oceans. d. friction between wind and the land surface. e. Earth's magnetic field.
What happens when a star like the sun exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It contracts, becoming hotter and brighter. C) It contracts, becoming smaller and dimmer. D) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness. E) It expands, becoming bigger but dimmer.
Which of the following best represents the energy transformations occurring in a solar-heated power plant?
A) chemical ? thermal ? electric B) electric ? thermal ? electric C) thermal ? radiant ? electric D) electric ? thermal ? radiant E) radiant ? thermal ? electric
When current is flowing in a superconductor, which statement is not true?
a. A battery is needed to keep the current going. b. Electrical charges are moving. c. The resistance is zero. d. No power is given off in the form of heat.