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Old Dec 3rd 2012, 03:27 PM   #1
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Rotation of rigid bodies

Hi, I can't figure out literally why the average of the instantaneous angular velocities of a rigid body should be different from the average angular velocities in a given time interval.
Looking at a question I solved; the average of the instantaneous angular was 0.850 rad/s whilst the average angular velocity was 0.700 rad/s. Ref: University Physics with Modern Physics Ed. 12 page 308 Exercise 9.5.
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Old Dec 4th 2012, 07:53 AM   #2
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Please provide more info about this - I don't have that particular book so am having trouble understanding your question. The average of instantaneous measurements may be different than the true average depending on when the instantaneous measurements are taken, particularly if the velocity is not linear in time (i.e. if the angular acceleration is not constant).

Last edited by ChipB; Dec 5th 2012 at 07:31 AM.
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