posted by mike .
A aeroplane with a mass of 9940 kg completes a vertical loop of radius 155m/s. What normal force does the airplane seat exert on the 92 kg pilot at the top of the loop and at the bottom of the loop?
We need the centripetal acceleration
Ac = v^2/r
you only gave one, the speed I think
at the top
force on seat = m (v^2/r - g)
at the bottom
m (v^2/r + g)