Capacitors in Combination: A system of four capacitors is connected across a 90-V voltage source as shown in the figure.(a) What is the potential difference across the plates of the 6.0-µF capacitor?(b) What is the charge on the 3.0-µF capacitor?
Fill in the blank(s) with the appropriate word(s).
(a) 30 V (b) 180 µC
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Energy in Capacitors: When a 12.0-V battery causes 2.00 ?C of charge to flow onto the plates of an air-filled capacitor, how much work did the battery do?
A. 24.0 ?J B. 12.0 ?J C. 144 ?J D. 576 J
How do we know that there is much more mass in the halo of our galaxy than in the disk?
A) There are so many globular clusters in the halo that their total mass is greater than the mass of stars in the disk. B) Stars and gas clouds in the outskirts of the Milky Way orbit the galaxy at much higher speeds than we would expect if all the mass were concentrated in the disk. C) We have discovered that the halo is filled with an enormous number of brown dwarfs that have a combined mass much greater than the disk. D) Laboratory experiments have proven that the halo must be full of subatomic dark matter particles.
On a prescription for eyeglass lenses, what does the quantity expressed in diopters refer to?
a. The thickness of eyeglass lenses. b. The limitations of the person's eyes. c. The width of the eyeglass lens. d. The strength of eyeglass lenses. e. The curvature of eyeglass lenses.
If the Universe were infinitely large, infinitely old, and static, then the CMB would appear uniform (i.e., homogenous and isotropic)
a. True b. False Indicate whether the statement is true or false