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.
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
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
A) less than 1 liter. B) 1 liter. C) more than 1 liter. D) depends on the water density E) none of the above