Solve the all parts of following problem:
Problem: A 55.0-kg stunt pilot who has been diving her airplane vertically pulls out of the dive by changing her course to a circle in a vertical plane.
Part A: If the plane's speed at the lowest point of the circle is 90.0 m/s, what is the minimum radius of the circle for the acceleration at this point not to exceed 4.00g?
Part B: What is the apparent weight of the pilot at the lowest point of the pullout?
Please show all work and steps to find the apparent weight of the pilot at the lowest point of the pullout.