Centripetal force on a stunt pilot

[nokia8650]

A stunt pilot who has been diving vertically at 150m/s pulls out to dive into a circle in the vertical plane.

a)What is the minimum radius of the circle, if the force on the pilot is not to exceed 6g.

b)If the pilot has a mass of 80kg, what is the apparent weight of the pilot at the lowest point of the circle?My solution:

a)6g = mv^2/r
r= 383*mass metres

b) 6g = R-mg
R= g(6+80)
=844N

Is the above correct? The answer to part a) seems abit too large to me!

Thank you very much for any assistance, I really appreciate it.

 

[tiny-tim]

A stunt pilot who has been diving vertically at 150m/s pulls out to dive into a circle in the vertical plane.

a)What is the minimum radius of the circle, if the force on the pilot is not to exceed 6g.

b)If the pilot has a mass of 80kg, what is the apparent weight of the pilot at the lowest point of the circle?

Hi nokia8650!

i] when people say a force of 6g, they mean an acceleration of 6g … so you can forget the mass in part a)

ii] is this an unpowered dive, so that the speed increases, or a powered dive at exactly the same speed throughout?