Fundamental Problem $13\mathrm{.}9$

A pilot weighs $160$ lb and is traveling at a constant speed of $\backslash (120\backslash$mathrm$\{$ft$\}/\backslash$mathrm$\{$s$\}\backslash ).$

Part A

Determine the normal force he exerts on the seat of the plane when he is upside down at $\backslash ($ A $\backslash ).$ The loop has a radius of curvature of $400$ ft $.$

Express your answer to three significant figures and include the appropriate units.

ANSWER:

$\backslash [$

N$=$

$\backslash ]$