Loop the loop question, given only radius.

AI Thread Summary
To determine the speed required for a plane to fly a loop without the pilot feeling any force from the seat or safety belt at the top of the loop, the pilot's weight must provide the necessary centripetal force. This condition occurs when the gravitational force equals the centripetal force needed to maintain the circular motion. The formula for centripetal force can be applied, incorporating the radius of the loop and the gravitational acceleration. The discussion emphasizes the relationship between speed, radius, and gravitational force in achieving this specific flight condition. Understanding these principles is crucial for solving the problem effectively.
marvolo1300
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How fast must a plan fly in a loop-de-loop if the pilot experiences no force from either the seat or the safety belt when he is at the top of the loop?

I just need to be pointed in the right direction. Thanks in advance for your help.
 
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His weight becomes the centripetal force.
 
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