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A wheel is revolving at steady rate of 120 revolution per minute its angular velocity in radians per second is closest to?
actually 1revolution=360 degrees,
then 120 revolutions=360*120 (degrees)=43200degrees
now degrees to radian is simple
43200 degrees=43200*PI/180=240pi radians
now we can write as 120 revolution/minute=240pi radians/minute
to convert minute into sec we multiply by 60 so as min is in denominator so we sill devide it by 60,
120 revolution/minute=240pi/60 radians/sec=4pi
ans = 4pi
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