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**1. Homework Statement**

A 2000 kg plane does a vertical loop with radius 600 m at a velocity of 120 m/s. At the very top of the loop, what is the force from the air required?

Plane's mass = 2000 kg

Radius = 600 m

Velocity = 120 m/s

**2. Homework Equations**

F = (mv^2)/R

Wt = mg

Net F-sub y = ma = 0

**3. The Attempt at a Solution**

-Wt -Fcentripetal + Fair = 0

-19600 N - 48000 N + Fair = 0

Fair = 67600 N