an airplanes propeller completes one revolution in 65ms. a)what is the angular speed in rpm? in rad/s?

-- We already know the rate of revolutions per time ... it's 1 revolution per 0.065 sec.  We just have tounit-convert that to 'per minute'.(1 rev / 0.065 sec) x (60 sec / min) = (1 x 60) / (0.065) = 923 RPM  (rounded)_______________________________-- 1 revolution = 2π radians  (2π rad) / (0.065 sec) = (2π / 0.065) = 96.66 rad/sec  (rounded)