A series circuit consists of a 50-Hz ac source, a 50-? resistor, a 0.50-H inductor, and a 60-?F capacitor. The rms current in the circuit is measured to be 3.1 A. What is the voltage amplitude of the source?
A) 220 V B) 160 V C) 510 V D) 180 V E) 270 V
C
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What does increasing the tension of a guitar string do?
a. Decrease the speed and decrease the frequency of the fundamental. b. Decrease the speed and increase the wavelength of the fundamental. c. Decrease the speed and increase the frequency of the fundamental. d. Increase the speed and decrease the frequency of the fundamental. e. Increase the speed and increase the frequency of the fundamental.
Parallel-Plate Capacitor: Two parallel square metal plates, 8.4 cm on each side, are 2.5 mm apart and carry equal but opposite charge uniformly distributed over their facing surfaces. How much excess charge is there on each plate if the electric field between the plates has a magnitude of 2.0 × 106 N/C? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
Fill in the blank(s) with the appropriate word(s).
Water undergoes viscous flow through two pipes with the same pressure difference between the ends. Pipe 1 has three times the diameter as pipe 2. Pipe 1 has 2 times the length of pipe 2. If the flow rate through pipe 1 is 0.400 
then what is the flow rate through pipe 2?
A. 
B. 
C. 
D. 
E. 
The key to identifying a black hole candidate in a binary system is that
A) one of the two stars cannot be seen. B) the unseen companion in the system must have a sufficiently high mass. C) the unseen star is a contact binary. D) the system must be a very strong source of radio emissions. E) the visible companion must be an evolving main sequence or giant star.