Question reads: Snoopy is flying his vintage war plane in a "loop the loop" patch chasing the red baron. his instrumenets tell him the plane is level ( at the bottom of the loop) and travelling with a speed of 180km/h. he is sitting on a set of bathroom scales. and notes that they read four times the normal force of gravity on him. what is the radius of the loop. answer in meters My progress: ok so we know that the plane has velocity of 180km/h which is 50m/s. And there are two forces acting on the plane at the bottom of the loop. Fn [upward] and Fg [downward] (in this case Fn is greater? because it's acceleration is towards center,) fn - fg = ma 4mg - mg = mv2/r ?? is this correct ?