An AC circuit has a 100. ohm resistor in series with a 4.9 ?F capacitor and a 700. mH inductor. At what frequency does the circuit act like a pure resistance?
A) 86. Hz
B) 0.54 kHz
C) 1.9 mHz
D) 0.29 MHz
E) 12. mHz
A
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Two equal positive charges are near each other. If we increase the amount of charge on just one of them, then
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The "aspect ratio" of thickness to width of the galactic disk is about:
A) 1:2. B) 1:5. C) 1:10. D) 1:100. E) 1:1,000.
Amy, Brad, and Cate are walking (or running) along a straight line as shown below