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# mPEC Forum

## ฟิสิกส์และคณิตศาสตร์มหาวิทยาลัย => บทที่ 4 Taylor's Classical Mechanics => Topic started by: ปริ่มน้ำ on July 28, 2010, 04:05:17 PM

 Title: 4.53 Post by: ปริ่มน้ำ on July 28, 2010, 04:05:17 PM (a) An electron (charge -e and mass m) is in a circular orbit of radius r around a fixed proton (charge +e). Prove that the electron's KE is equal to -1/2 times its PE; that is, T= -U/2 and hence E= U/2. (b) Inelastic collision : Electron number 1 is in a circular orbit of radius r around a fixed proton.Electron 2 approaches from afar with kinetic energy When the second atom hits the atom, the first electron is knocked free, and the second is captured in a circular orbit of radius . Write down the expression for the total energy of the three-particle system in general.(c) Identify the value of all five terms and the total energy E long before the collision occurs and long after it is over. What is the KE of the outgoing electron 1 once it is far away?ภัทราวรรณ พาสุวรรณ 5205097 "น้องปริ่ม"