A figure skater is spinning with an angular velocity of +16.5 rad/s. She then comes to a stop over a brief period of time. During this time, her angular displacement is +3.98 rad. Determine (a) her average angular acceleration and (b) the time during which she comes to rest.

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Asked Oct 20, 2019
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A figure skater is spinning with an angular velocity of +16.5 rad/s. She then comes to a stop over a brief period of time. During this time, her angular displacement is +3.98 rad. Determine (a) her average angular acceleration and (b) the time during which she comes to rest.

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Expert Answer

Step 1

(a) Average angular acceleration is,

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oj-af a- 20 (0rad's)-(16.5rad's) - (16.5 rad/s) 2(3.98rad) =-34.2rad/s

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Step 2

(b) Time during which the skater co...

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t= (Orad's)-(16.5rad's) (-34.2rad/'s 0.482s

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