A roller coaster car travels on a track with a circular loop with radius r = 25.0 m at a constant speed of v = 28.3 m/s as shown in the diagram.

(a) What is the centripetal acceleration of the roller coaster car as it travels in uniform circular motion around the loop?

(b) What is the apparent weight (normal force in Newtons) of a 70.0 kg passenger in the car when the car is at the very top of the loop?

(c) What is the apparent weight (normal force in Newtons) of the 70.0 kg passenger in the car when the car is at the very bottom of the loop?