Aspeedboat with a mass of 525 kg (including the driver) is tethered to a fixed buoy by a strong 31.3 m cable. the boat's owner loves high speed, but does not really want to go anywhere. so the owner revs up the boat's engine, makes a lot of noise, and runs the boat in circles around the buoy with the cable supplying all the necessary centripetal force. when the tension of the cable is steady at 12900 n, with what force is the boat's engine pushing the boat?