A 60.0-?F capacitor is in series with a 100-? resistor connected across an ac source of frequency 120 Hz. What is the phase angle?
A) -12.4°
B) +12.4°
C) -77.6°
D) +77.6°
E) 90.0°
A
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A filtergram is a photograph of the Sun's surface made
a. in a band of wavelengths in the infrared. b. in a band of wavelengths in the ultraviolet. c. using the Zeeman effect. d. with only those photons emitted in a specific spectral line. e. none of the others.
Why has NASA sent recent orbiters to Mars on trajectories that required them to skim through Mars's atmosphere before settling into their final orbits?
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The amount of water displaced by a liter-sized block of ordinary wood floating in water is
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What value of wavelength is associated with the Lyman series for n = 2? (RH = 1.097 × 10^7 m?1)
a. 8.2 × 10^6 m b. 1.2 × 10^?7 m c. 2.7 × 10^6 m d. 3.6 × 10^?7 m e. 8.8 × 10^?7 m