An ac circuit has a 100-? 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) 0.29 MHz
B) 1.9 MHz
C) 12 MHz
D) 0.54 kHz
E) 86 Hz
E
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Relative Velocity: A plane has an airspeed of 200 m/s northward, and is in a wind of 50.0 m/s to the west. The plane's speed relative to the ground is
A. 150 m/s. B. 200 m/s. C. 206 m/s. D. 250 m/s.
Two-Source Interference of Sound: Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance from the wall the person can stand and hear destructive interference? The speed of sound in air is 343 m/s.
A. 0.34 m B. 0.37 m C. 0.73 m D. 1.2 m E. 1.6 m
Suppose we use a string to suspend a ball from a hook in the ceiling. As the ball swings back and forth, which interaction does work on the system if we consider the system to be the ball or
A. The ball’s gravitational interaction with the earth B. The ball’s contact interaction with the string C. Both interactions D. Neither interaction
If you find you are able to move a positive charge from infinity (far away) to a particular point without doing any work, can you infer that no other charges are nearby?
What will be an ideal response?