A device for training astronauts and jet fighter pilots is designed to rotate a trainee in a horizontal circle of radius 11.0 m. If the force felt by the trainee on her back is 7.25 times her own weight, how fast is she rotating
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(II) A device for training astronauts and jet fighter pilots is designed to rotate a trainee in a horizontal circle of radius 12.0 $\mathrm{m}$ . If the force felt by the trainee on her back is 7.85 times her own weight, how fast is she rotating? Express your answer in both $\mathrm{m} / \mathrm{s}$ and rev/s.
3. In order to train pilots at experiencing 'g' forces, candidates are placed at the end of a 2.5m long steel beam and rotated on a horizontal plane. If the pilot experiences centripetal acceleration of 78 m/s^2, at what speed is she rotating?
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