what angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1 000g at a radius arm of 15.0 cm?

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?