# Uniform circular motion - plane in a circular arc

## Homework Statement

As a pilot comes out of a dive in a circular arc she experiences an upward acceleration of 9.0 gs (i.e. 9 x 9.8).

a) Mentions that the Pilot's mass is 60 kg, already solved this

b) If the speed of the plane is 330 km/h, what is the radius of the plane's arc?

## Homework Equations

ac = v2/r
Fnet = $$\Sigma$$F

## The Attempt at a Solution

No idea what to do because I can't figure out what is causing the centripetal acceleration.

mv2/r = - mg

I don't know the mass of the plane, and if I add another force which I assume would cause the centripetal acceleration then I have no way of calculating that either.