What is the average power dissipated by a resistor of resistance R = 25 ? in an LRC circuit for which the power factor is equal to 0.25 and the maximum voltage of the AC source is 8 V?
A)
0.04 W
B)
0.32 W
C)
0.16 W
D)
0.62 W
E)
0.08 W
E
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Impedance: In a series RLC ac circuit, a second resistor is connected in parallel with the resistor previously in the circuit. As a result of this change, what happens to the impedance of the circuit?
A. It increases. B. It decreases. C. It does not change. D. It increases for frequencies below resonance and decreases for frequencies above resonance. E. It decreases for frequencies below resonance and increases for frequencies above resonance.
The rigid body shown is rotated about an axis perpendicular to the paper and through the point P. If M = 0.40 kg, a = 30 cm, and b = 50 cm, how much work is required to take the body from rest to an angular speed of 5.0 rad/s? Neglect the mass of the connecting rods and treat the masses as particles
a.
2.9 J
b.
2.6 J
c.
3.1 J
d.
3.4 J
e.
1.6 J
Q1 = 6.0 nC is at (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude and direction of the net force on the 5.0 nC charge?
What will be an ideal response?
Electric charge will flow in an electric circuit when
A) electric resistance is low. B) a potential difference exists. C) the circuit is grounded. D) electric devices in the circuit are not defective.