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Simple Harmonic Motion-Help Please

  1. Jul 20, 2007 #1
    Simple Harmonic Motion-Help Please :)

    1. The problem statement, all variables and given/known data

    A loundspeaker diaphragm is producing a sound for 1.5 s by moving back and forth in a simple harmonic motion. The angular frequency of the motion is 8.50 104 rad/s. How many times does the diaphragm move back and forth?

    ________ times

    2. Relevant equations

    ang.freq.=2pi/T

    f=1/T

    3. The attempt at a solution

    Ok, so I plugged in w=85000rad/s and t=1.5s and got T=0.00007392 and f=13528.139 cycles/sec and

    multiplied that f i got by 1.5 sec to get 200292.209 cycles which is wrong..

    I dont know what i did wrong...can someone help?
     
  2. jcsd
  3. Jul 20, 2007 #2
    Everything looks right, except f * 1.5s = 20292.209 not 200292.209
     
  4. Jul 20, 2007 #3
    thanks!!!! i always make dumb mistakes like that haha..
     
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