An airplane flies in a loop (a circular path in a vertical plane) of radius 150 m. The pilot's head always points toward the center of the loop. The speed of the airplane is not constant; the airplane goes slowest at the top of the loop and fastest at the bottom.
(a) At the top of the loop, the pilot feels weightless. What is the speed of the all plane at this point?
(b) At the bottom of the loop, the speed of the all plane is 280 km/h. What is the apparent weight of the pilot at this point? His true weight is 700 N.