A tightrope walker more easily balances on a tight wire if her pole
A) is held high.
B) droops.
C) is short but heavy.
Answer: B
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Two-Source Interference of Sound: 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. 2190 Hz B. 2420 Hz C. 2110 Hz D. 2340 Hz E. 2270 Hz
When an object experiences uniform circular motion, the direction of the acceleration is
A) in the same direction as the velocity vector. B) in the opposite direction of the velocity vector. C) is directed toward the center of the circular path. D) is directed away from the center of the circular path. E) depends on the speed of the object.
For an unpolarized EM wave, the electric field direction is
A. perpendicular to the magnetic field direction. B. parallel to the magnetic field direction. C. perpendicular to the direction of wave propagation, but randomly oriented with respect to the magnetic field direction. D. parallel to the direction of wave propagation.
A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 atm= 1.01 × 10^5 N/m2
a. 1.0 atm b. 4.2 atm c. 7.2 atm d. 9.7 atm e. 8.2 atm