saplinglearning.com a-PHYS 2113-Fall17-ZOETEWEY: HW: Rotational Motion /1/2017 1
ID: 1792575 • Letter: S
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saplinglearning.com a-PHYS 2113-Fall17-ZOETEWEY: HW: Rotational Motion /1/2017 11:55 PM 30/100 PrintCalculator Periodic Table Grac on 12 of 35 Sapling Learning i disk is spun at 323 6 rad is while it is what is the magnitude of the average computer can spin a disk up to 10,000 rpm (about 1045 rad /s). If a particular read, and then is allowed to come to rest over 0.234 seconds acceleration of the disk? Number rad/s If the disk is 0.12 m in diameter, what is the magnitude of the tangential acceleration of a point 1/7 of the way out from the center of the disk? Number m/s There is a hint available! View the hint b on the bottom drvider bar Click on the divider bar again to hide the hin CloseExplanation / Answer
formula for average angualr accleration of the disk is
alpha = wf- wi/t
=0-323.6/0.234
=-1382.9 rad/s^2
magnitude of average angular accleration is = 1382.9 rad/s^2
(b)
radius of the disk is r = D/2 = 0.12/2 = 0.06 m
the new distance is r' = r/7 = 0.06/7 = 0.00857 m
tangential accleration is
a= r' alpaha = 0.00857 ( 1382.9) = 11.85 m/s^2
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