A series LRC ac circuit has a peak current of 1.0 A with a frequency of 54 kHz. If the resistance of the circuit is 51 k?, the capacitance of the circuit is 19 ?F, and the inductance of the circuit is 25 ?H, determine the average power of the circuit
A) 26 kW
B) 77 kW
C) 7.7 kW
D) 4.1 kW
Answer: A
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A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 350 kg/m3. The board is floating partially submerged in water of density 1000 kg/m3. What fraction of the volume of the board is above the surface of the water?
A) 0.350 B) 0.650 C) zero D) 0.200 E) The answer depends on which edge of the board is vertical.
Jennifer bought a 7 x 25 pair of binoculars for observing baseball. The 25 describes the
A) aperture in cm. B) aperture in mm. C) f/number. D) magnification. E) .
In a RLC circuit, the values of the inductance and capacitance are both doubled. In comparison with the resonance frequency of the original circuit, the new resonant frequency will be
A) the same as before. B) reduced to one-half the original value. C) reduced to one-quarter the original value. D) increased by a factor of two. E) increased by a factor of four.
What inductance must be put in series with a 200-? resistor at 4000 Hz to have a total impedance of 240 ??
A) 3.28 mH B) 4.28 mH C) 5.28 mH D) 6.28 mH E) 12 mH