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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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.
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.
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 ?
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