35.0 m/s UA = 0 UL = 15.0 m/s %3D A B
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Two train whistles, A and B, each have a frequency of 392 Hz.
A is stationary and B is moving toward the right (away from A) at a
speed of 35.0 m/s. A listener is between the two whistles and is moving
toward the right with a speed of 15.0 m/s (Fig. ). No wind
is blowing. (a) What is the frequency from A as heard by the listener? (b) What is the frequency from B as heard by the listener? (c) What is
the beat frequency detected by the listener?
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