A figure skater starts from rest and begins spinning with an angular acceleration of 15 rad/s2. How long will it take her to spin 8.6 radians?
Initial angular speed of skater,i=0
Angular acceleration,=15 rad/s2
Angular displacement,=8.6 rad.
According to constant rotational motion angular displacement is given by
=it+(1/2)t2=0+(1/2)t2
So
time t=(2/)1/2=(28.6/15)1/2=1.07 sec
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