Average strain in the spike
A 26.0 kg hammer strikes a steel spike 2.90 cm in diameter while moving with speed of 20.0 m/s. The hammer rebounds with speed 10.0 m/s after 0.110 s. What is the average strain in the spike during the impact?
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A roller coaster has a vertical loop with radius 27.6 m. With what minimum speed should the roller coaster car be moving at the top of the loop so that the passengers do not lose contact with the seats?
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