試題詳解

43. A jet aircraft of speed 200 m/s is making a vertical circular loop of radius 2 km. What is the force exerted by the seat on the 60-kg pilot at the top of the loop? (Gravitational acceleration g = 9.8 m/s²)
(A)12N
(B)24 N
(C)306N
(D) 612 N
(E) 48 N