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14 July, 16:26

An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad / s). if a particular disk is spun at 792.7 rad / s while it is being read, and then is allowed to come to rest over 0.234 seconds, what is the magnitude of the average angular acceleration of the disk?

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  1. 14 July, 16:48
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    (i) |α| = 235.6rad. s / 0.502s = 469 rad/s²

    (ii) tang a = α*r = 469rad/s² * 0.12m / 2*11 = 2.56 m/s²
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