If VA?VB = 50 V, how much energy is stored in the 36-?F capacitor?
A. 50 mJ
B. 28 mJ
C. 13 mJ
D. 8.9 mJ
E. 17 mJ
Answer: D
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RLC Circuits: A 120-V rms voltage at 1.0 kHz is applied to a 2.0-mH inductor, a 4.0-?F capacitor and a resistor. If the rms value of the current in this circuit is 0.40 A, what is the value of the resistor?
A. 300 ? B. 95 ? C. 420 ? D. 120 ? E. 240 ?
Ilona and Olivia observe a virtual image formed by an object placed a distance in front of a convex lens of focal length f. They argue about where to place a concave lens of focal length ?f to have a virtual image at the same location relative to the lens that they had with the convex lens. Ilona says that the object should also be placed a distance
/> in front of the concave lens. Olivia says that this won't work. Which one, if either, is correct, and why? A.
B.
C.
D.
E.
If vector = -3.0 - 4.0 , and vector = +3.0 -8.0 , then the magnitude of vector = - is
A) 3.0 B) 16 C) 7.2 D) 144 E) 13.4
In winter, light-colored clothes will keep you warmer than dark-colored clothes if:
a. you are warmer than your surroundings. b. you are at the same temperature as your surroundings. c. you are cooler than your surroundings. d. you are standing in sunlight.