Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 5.00 m
A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 1.00 m parallel to the wall, she experiences destructive interference for the first time. What is the frequency of the sound? The speed of sound in air is 343 m/s.
A) 211 Hz B) 422 Hz C) 674 Hz D) 512 Hz E) 256 Hz
B
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A particle moving along the x axis has a position given by x = (24t – 2.0t3) m, where t is measured in s. What is the magnitude of the acceleration of the particle at the instant when its velocity is zero?
a. 24 m/s2 b. zero c. 12 m/s2 d. 48 m/s2 e. 36 m/s2
It takes ________ astronauts to operate the Hubble Space Telescope
Fill in the blank(s) with correct word
Nellie whirls a tether ball in a horizontal circular path over her head. If the action force is Nellie pulling on the string, the reaction force is
A) Nellie pulling on the string. B) the string pulling on Nellie. C) the ball pulling on the string. D) none of the above
If you thrust a magnet into a closed loop of wire, the loop will
A) rotate. B) have a current in it. C) both of these D) neither of these