A capacitor of capacitance C = 5 ?F and initial charge Q = 30 ?C is connected to an inductor of inductance L = 20 mH. What is the electric current in the circuit when the energy stored in the capacitor is 25% of its maximum value?
A)
0.001 A
B)
0.08 A
C)
0.04 A
D)
0.02 A
E)
0.01 A
B
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A) that it worsens the problem only if the wood is burned. B) that it actually helps reduce the problem. C) that it worsens the problem regardless of whether the wood is burned. D) essentially zero.
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A) 2.2 mm in front of the lens B) 2.2 mm behind the lens C) 9.0 mm behind the lens D) 20 mm in front of the lens
Star #1 is approaching the Earth with speed v. Star #2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
a. star #1 b. Both stars will have the same shift. c. The value of the speed must be known before an answer can be found. d. star #2