Two loudspeakers placed 6.00 m apart are driven in phase by an audio oscillator having a frequency range from 1908 Hz to 2471 Hz
A point P is located 4.70 m from one loudspeaker and 3.60 m from the other speaker. At what frequency of the oscillator does the sound reaching point P interfere constructively? The speed of sound is 344 m/s.
A) 2420 Hz B) 2110 Hz C) 2190 Hz D) 2340 Hz E) 2270 Hz
C
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Suppose that the maximum rate of change of current in a "high power" transmission line is 104 A/s. How large a coil (area) placed 10. meters from the line would have 120. volts (max) induced in it?
A) 6. × 103 m2 B) 2. × 105 m2 C) 6. × 105 m2 D) 2. × 103 m2 E) 6. × 104 m2
A magnifying lens with a focal length of 30 cm has what magnification when the viewing eye is relaxed?
a. 7.14 b. 0.8 c. 1.3 d. 1.8 e. –0.2
A particle (charge 7.5 ?C) is released from rest at a point on the x axis, x = 10 cm. It begins to move due to the presence of a 2.0-?C charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passes the point x = 1.0 m?
a. 3.0 J b. 1.8 J c. 2.4 J d. 1.2 J e. 1.4 J
Cepheids are types of stars that regularly change how bright they are over a period of a few
A) days. B) months. C) year. D) decades.