For a beam of light, the direction of polarization is defined as
A)
the beam's direction of travel.
B)
the direction of the electric field's vibration.
C)
the direction of the magnetic field's vibration.
D)
the direction that is mutually perpendicular to the electric and magnetic field vectors.
B
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The element most abundant in the Sun is oxygen
a. True b. False Indicate whether the statement is true or false
LC Circuits: A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. How long after closing the switch does the magnetic energy in the inductor first reach its maximum value?
A. 2.0 ms B. 4.0 ms C. 6.0 ms D. 8.0 ms E. 10 ms
A rising balloon is buoyed up with a force equal to the
A) weight of air it displaces. B) density of surrounding air. C) atmospheric pressure. D) weight of the balloon and its contents. E) all of the above
What is indicated by a gasoline's octane rating?
A) the degree of branching in the gasoline hydrocarbons B) the degree at which the compound ignites C) the percentage of octane in the mixture D) a measure of how many degrees it takes to ignite a mixture of octane E) none of the above