What is one "kilowatt-hour" [kW ? h]?
A) It is the energy output of one kilowatt operating for one hour.
B) It is work done continuously for one hour.
C) It is the force output of one kilowatt operating for one hour.
D) It is the power output of a one kilowatt device.
E) Actually, nobody knows what this term means.
A
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An open circuit consists of a 12 ?F parallel plate capacitor charged to 200 V and a 10 ? resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is
a. 1.2 ?A. b. 2.4 × 10^?4 A. c. 2.4 mA. d. 10 A. e. 20 A.
If Earth's radius somehow increased with no change in mass, your weight would
A) increase also. B) decrease. C) stay the same.
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is open,
A. bulb 1 is glowing; bulb 2 is dark. B. bulb 2 is glowing; bulb 1 is dark. C. both bulbs glow equally brightly. D. both bulbs glow one half as brightly as they do with the switch closed. E. both bulbs are dark.
You observe a galaxy that is 100 million light-years away. Which of the following do you see?
A) The light from the galaxy as it is today, and it is blueshifted. B) The light from the galaxy as it is today, and it is redshifted. C) The light from the galaxy as it was 100 million years ago, and it is blueshifted. D) The light from the galaxy as it was 100 million years ago, and it is redshifted. E) Nothing: the galaxy lies beyond the cosmological horizon.