What sort of energy is stored within an object suspended above the ground?
a. Chemical energy
b. Kinetic energy
c. Magnetic energy
d. Potential energy
Ans: d. Potential energy
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The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was
A) zero. B) 110. C) 220. D) billions of billions. E) none of the above
A changing current in one loop of wire can induce a current in another loop of wire even though the wires do not touch. The induced current appears almost instantaneously for loops close together. How can this energy exchange happen?
a. This is one of those things for which science has no adequate explanation yet. b. The second loop is affected by the thermal exchange from the heating of the first loop. c. It is a gravitational effect on the electrons. d. It is done via an electromagnetic wave.
Three resistors connected in series have individual voltages labeled ?V1, ?V2 and ?V3, respectively. Which of the following expresses the value of the total voltage ?VT taken over the three resistors together?
a. ?VT = ?V1 + ?V2 + ?V3 b. ?VT = (1/?V1 + 1/?V2 + 1/?V3) c. ?VT = ?V1 = ?V2 = ?V3 d. ?VT = (1/?V1 + 1/?V2 + 1/?V3)?1
What is the energy of a photon with a frequency of 5.2 × 10^14 Hz?
a. 3.4 × 10^-19 J b. 1.3 × 10^-20 J c. 0.8 × 10^-20 J d. 0.3 × 10^-21 J