a wheel revolves 360 degree revolution in one minute.Find how many radians will the wheel subtend in one second
1 min = 60 sec
1 sec = 1 / 60 min
360° / min = 360 ° / 60 = 6 ° / sec
1 rad = 180 ° / pi
1 ° = pi / 180 rad
6 ° * pi / 180 = pi / 30 rad / sec