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## Homework Statement

A 180lb pilot flies a verticle loop with radius 2000 ft at 350 mi/h. With what force does the seat fress upward against him at the bottom of the loop?

Problem 6.21

## Homework Equations

##F=ma##

##F_c=\frac {mv^2} {r} ##

## The Attempt at a Solution

There seems to be a discrepancy in the answer key provided? On the first line the equation they came up is ## F= \frac {mv^2} {r} + mg## . But when the number was plugged in, it seems like they use the equation ##F= \frac {mv^2} {gr} + m ## Which equation is correct? My own answer corresponds with the first equation, which is why I get a different numerical answer.

Thank you!