The pilot of an airplane executes a loop-the-loop maneuver in a vertical circle. The speed of the airplane is 350 mi/h, at the top of the loop and 450 mi/h at the bottom, and the radius of the circle is 1 300 ft. Note: His apparent weight is equal to the magnitude of the force exerted by the seat on his body.
(a) What is the pilot's apparent weight at the lowest point if his true weight is 160 lb?