In a laboratory test of tolerance for high acceleration, a pilot is swung in a circle 13.5 m in diameter. It is found that the pilot blacks out when he is spun at 30.6 rpm (rev/min). @ Macmillan Learning At what acceleration (in SI units) does the pilot black out? acceleration: m/$2 Express this acceleration in terms of a multiple of g. acceleration as a multiple of g: 8 If you want to decrease the acceleration by 23.0% without changing the diameter of the circle, by what percent must you percent of time change: change the time for the pilot to make one circle