Homework Help: College Physics

Posted by Jen on Thursday, November 1, 2007 at 2:47pm.

A young person with normal hearing can hear sounds ranging from 20 Hz to 20 kHz. How many octaves can such a person hear? (Recall that if two tones differ by an octave, the higher frequency is twice the lower frequency)

College Physics - DrBob222, Thursday, November 1, 2007 at 3:24pm
2^x*20 = 20,000
Solve for x = number of octaves. Check my thinking.
2¹⁰*20 = 20,480 Hz
2⁹*20 = 10,240 Hz
- College Physics - Ashley, Tuesday, July 29, 2008 at 6:02pm
  This is my problem:
  A proton is propelled east with a speed of 2.1e6 m/s to a region where there is a magnetic field of strength 5 T directed perpendicularly out of the paper. Calculate the radius of the resulting circular trajectory of the proton. A proton has a mass of 1.67e-27 kg and a charge of 1.67e-19 C.
  So I am looking for the radius of the loop, right? The formula I have is torque=current*area*strength*sin theta
  I need to know torque or the total are to find the radius, right? How do I do that?

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