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You are at the controls of a particle accelerator, sending a beam of 4.20x107 m/s...

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Physics

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You are at the controls of a particle accelerator, sending a beam of 4.20x107 m/s protons (mass m) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unknown element. All such protons rebound with a speed of 3.90x107 m/s. Assume that the initial speed of the target nucleus is negligible and the collision is elastic. Part A Find the mass of one nucleus of the unknown element. Express your answer in terms of the proton mass m. Part B What is the speed of the unknown nucleus immediately after such a collision? Express your answer in meters per second.

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