An 85,000 kg stunt plane performs a loop-the-loop, flying in a 260-m-diameter vertical circle. At the point where the plane is flying straight down, its speed is 55 m/s and it is speeding up at a rate of 12 m/s per second.
(a) What is the magnitude of the net force on the plane? You can neglect air resistance.
(b) What angle does the net force make with the horizontal? Let an angle above horizontal be positive and an angle below horizontal be negative.