Capacitor #1 has parallel plates of length L and width W, plate separation d, and is filled with dielectric with constant ?.Capacitor #2 has parallel plates of length 2L and width 2W, plate separation 2d, and is filled with dielectric with constant 2?. If a voltage V is applied to capacitor #1 and a voltage 2V is applied to capacitor #2, which capacitor stores more energy and by what factor?
a. Capacitor #2 by a factor of 8
b. Capacitor #2 by a factor of 16
c. Capacitor #1 by a factor of 4
d. Both capacitors store the same energy.
a
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Energy in Capacitors: An ideal, isolated, air-filled parallel-plate capacitor is not connected to a battery but has equal and opposite charges of 3.9 nC on its plates. The separation between the plates initially is 1.2 mm, and for this separation the capacitance is 3.1 × 10-11 F. How much work must be done to pull the plates apart until their separation becomes 7.7 mm? (?0 = 8.85 × 10-12 C2/N ? m2)
Fill in the blank(s) with the appropriate word(s).
From hottest to coolest, the order of the spectral types of stars is
A) OBAFGKM. B) OBAGFKM. C) ABFGKMO. D) OMKGFBA. E) ABCDEFG.
We can determine the surface temperature of a star from
a. studying its continuous spectrum. b. studying its line absorption spectrum. c. measuring the star's luminosity. d. Both a and c e. All of a, b, and c
Intensity of Sound: By how many decibels does the intensity level of a sound decrease when you triple your distance from a source of sound?
A. 9.5 dB B. 4.8 dB C. 6.0 dB D. 12 dB E. 3.0 dB