1. The problem statement, all variables and given/known data An airplane goes into a turn 3.6km in radius. If the banking angle required is 28 degrees from the horizontal, what is the plane's speed? 2. Relevant equations Newton's Second. The only forces acting on the plane are gravity and the normal force. This isn't given in the question, it is just obvious. Neglect friction. 3. The attempt at a solution My main problem is drawing the free body diagram. I really need help with this problem. A clean, clear thorough explanation. Show every step please!