An airplane moves 140 m/s as it travels around a vertical circular loop which has a 1.0-km radius. What is the magnitude of the resultant force on the 70-kg pilot of this plane at the bottom of this loop?
1) 2.1 kN
2) 1.4 kN
3) 0.69 kN
4) 1.5 kN
5) 1.3 kN
Answer: 2