What is the equivalent resistance between points A and B in the figure when R = 20 ??
a.
77 ?
b.
63 ?
c.
70 ?
d.
84 ?
e.
140 ?
c
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Standing Sound Waves: One of the harmonics of a column of air in a tube that is open at one end and closed at the other has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. How long is the tube? The speed of sound in air is 343 m/s.
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