When a carpenter shuts off his circular saw, the 10.0 inch diameter blade slows from 4440 rpm o 0.00 rpm in 2.?
What is the angluar acceleration of the blade?
Ok, i’m confused by this question.
angular acceleration is delta v/delta t.
I converted 4440 rpm to 464.9 rev/s and divided it by 2.5 sec.
but that is not the correct answer.
I then used Angular velocity final = angular velocity initial + 2(angular acceleration)(time)
and still could not get the correct answer.
what am i doing wrong?
First of all to put you on the right track is that angular acceleration of what is named “alpha” using the unit “α” of which are rad/s^2. There are 2pi (6.283) radians in 1 revolution.
4440 rpm / (60/2pi) = 464.92 rad/s (omega of which is angular speed).
(0 – 464.92)/2.5 = – 185.97 rad/s^2 (minus because its coming to stop, so its negative acceleration).
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