THE PROBLEM On a hot day, you have started a fan blowing air directly on you at

Question

THE PROBLEM On a hot day, you have started a fan blowing air directly on you at 43 rpm j. After f-13 seconds you increase the angular speed and turn the fan by 90 degrees, giving ,-59 rpm . Calculate the average angular acceleration (magnitude and direction). PAPER SOLUTION Solve the problem on paper first, including all four IDEA steps. You will become a better physicist that way! Have you finished your paper solution already? yes o no NTERPRET DEVELOP In your answers below, type wi and wf to representw and w Derive an algebraic expression for the magnitude of the average acceleration. Deive an algebraic expression for the direction of the average acceleration (counterclockwise from as usual) 0-

Explanation / Answer

wi = 43 rpm j^

wf = 59 rpm i^

t = 13 s

a) Using equation

    wf = wi + *t

   = (wf - wi)/t

b) Angle =arctan(wi/wf) = arctan(43/59) = 36.1 degree

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