There are two forces that act on the pilot: the gravitational force directed towards the center of the loop and the normal force exerted on the pilot directed away from the center of the loop. Let's choose the downwards as the positive direction and apply the Newton's Second Law of Motion:
Since the pilot experiences the weightlessness at the top point of the loop, the normal force exerted on the pilot equals zero. Therefore, we get:
From this formula we can find the radius of the loop:
Answer:
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