A pilot of mass `m` can bear a maximum apparent weight `7` times of `mg`. The aeroplane is moving in a vertical circle. If the velocity of aeroplane is `210 m//s` while diving up from the lowest point of vertical circle, then the minimum radius of vertical circle should be

Options

A. 375 m
B. 420 m
C. 750 m
D. 840 m

Answer

C

Explanation

At lowest point of vertical circle,
`T_(max)=(mv^(2))/(r_(min)) + mg`.