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28 February, 18:29

The engineer determines that the machine increased at a constant rate the disk's angular speed from 100 rad/s to 300 rad/s over a time of 5 seconds. What was the angular displacement of the disk during those 5 seconds?

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  1. 28 February, 20:19
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    The disk's average angular speed during those 5 seconds was

    (1/2) (100 + 300) rad/s = 200 rad/sec

    Spinning for 5 sec at an average angular speed of 200 rad/s, the disk turned

    (200 rad/s) x (5 s) = 1,000 radians

    (That's 500/pi revolutions = roughly 159.2 revolutions.)
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