A pilot
of a jet weighs 140 lbs and executes a vertical loop which in part follows
the path of a cardioid whose r = 500(1+ cos q)
ft. Calculate the vertical force the belt of his seat must exert on him
to hold him to his seat when the plane is upside down if the constant speed
at A is v = 70 ft/s. a. 100 lbs b. 115 lbs c. 108 lbs d. 120 lbs 

We have r = 500(1+
cos q) 