Tuesday
June 18, 2013

Homework Help: physics

Posted by Anonymous on Tuesday, December 13, 2011 at 3:09am.

Two motorcycles are traveling in opposite directions at the same speed when one of the
cyclists blasts his horn, which has frequency of 544 Hz. The other cyclist hears the
frequency as 522 Hz. If the speed of sound in air is 344 m/s, what is the speed of the
motorcycles

• physics - bobpursley, Tuesday, December 13, 2011 at 8:03am

http://en.wikipedia.org/wiki/Doppler_effect Use that equation.

• physics - drwls, Tuesday, December 13, 2011 at 8:09am

The motorcyclists are going in opposite directions, away from one another. Each has speed v and the sound speed is a. The received frequency is
522 = 544*(a-v)/(a+v)
(344-v)/(344+v) = 0.95956
344-v = 330.09 + 0.94956v
1.94956v = 13.912
v = 7.1 m/s

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