A Giant Wheel, Having a Diameter of 40 M, Is

Multiple Choice

A giant wheel, having a diameter of 40 m, is fitted with a cage and platform on which a man of mass m stands. The wheel is rotated in a vertical plane at such a speed that the force exerted by the man on the platform is equal to his weight when the cage is at X, as shown. The net force on the man at point X is:

A) zero
B) mg, down
C) mg, up
D) 2 mg, down
E) 2 mg, up