A 200-? resistor, a 40.0-mH inductor and a 2.00-?F capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the impedance of this circuit?
A) 164 ?
B) 120 ?
C) 264 ?
D) 200 ?
E) 364 ?
C
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Which of the following correctly lists spectral types in order of decreasing temperature (from hottest to coolest)?
A) MKGFABO B) OBAGFKM C) OBAFGKM D) ABFGKMO E) BAGFKMO
An object moving on a circle at constant speed is an example of accelerated motion.
Answer the following statement true (T) or false (F)
What direct evidence do we have that the weak and electromagnetic forces were once unified as a single electroweak force?
A) The most advanced telescopes are able to see back to this era in the universe. B) Detectors on Earth have received photons and high-energy particles from this era. C) Temperatures in the center of the Sun can reproduce the conditions during this era. D) Particle accelerators on Earth can reach energies equivalent to the high temperatures of this era and have produced particles predicted by the electroweak theory. E) We have no direct evidence of the electroweak force.
When two organ pipes open at both ends sound a perfect fifth, such as two notes with fundamental frequencies at 440 Hz and 660 Hz, both pipes produce overtones. Which choice below correctly describes overtones present in both pipes?
a. 440, 880 and 1 320 Hz. b. 660, 1 320 and 1 980 Hz. c. 880, 1 320 and 1 760 Hz. d. 1 320, 2 640 and 3 960 Hz. e. They have no overtones in common.