Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?
a. 57 ?N
b. 40 ?N
c. 69 ?N
d. 50 ?N
e. 20 ?N
c
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Doppler Effect: A police car has an 800-Hz siren. It is traveling at 35.0 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?
A. 0 Hz B. 82 HZ C. 166 Hz D. 249 Hz
Phase Angles: At 1.00 kHz, the phase angle of an RLC series circuit with an inductive reactance of 200 ?, a resistance of 200 ? and a certain capacitor is 40.0°. What is the capacitance of the capacitor in this circuit?
A. 1.95 ?F B. 2.95 ?F C. 3.95 ?F D. 4.95 ?F E. 5.95 ?F
If the Sun suddenly stopped emitting neutrinos, what might we infer (after checking that our neutrino detectors were still operational)?
A) Fusion reactions in the Sun have ceased within the past few minutes. B) Fusion reactions in the Sun ceased a few hundred thousand years ago. C) Fission reactions in the Sun have ceased. D) The Sun has exhausted its supply of neutrinos.
A tennis player standing 12.6 m from the net hits the ball at 3.00° above the horizontal. To clear the net, the ball must rise at least 0.330 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racket?