Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 1536 Hz. You move between the speakers, along the line joining them, at a constant speed of 2.8 m/s
What beat frequency do you observe? The speed of sound in the room is 330 m/s.
A) 13 Hz
B) 431 Hz
C) 26 Hz
D) 4.7 Hz
E) 118 Hz
Answer: C
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Charge Q1 = 6.0 nC is at (0.30 m, 0), charge Q2 = -1.0 nC is at (0, 0.10 m), and charge Q3 = 5.0 nC is at (0, 0)
What are the magnitude and direction of the net electrostatic force on the 5.0-nC charge due to the other charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
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Rank the following five capacitors in the order of the magnitudes of the charges on their plates
(a) a 20-µF capacitor with a 4-V potential difference between its plates (b) a 30-µF capacitor with charges of magnitude 90 µC on each plate (c) a capacitor with charges of magnitude 80 µC on its plates, differing by 2 V in potential, (d) a 10-µF capacitor storing energy 125 µJ (e) a capacitor storing energy 250 µJ with a 10-V potential difference
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