A 80 kg pilot flies a plane in a loop. At the top of the loop, where the plane is completely upside-down the pilot feels no forces from the seat or the seat belts. (The pilot is “weightless.”) If the plane’s speed is 150 m/s, what is the radius of the loop?

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Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

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