08_spring_midterm2(2)

08_spring_midterm2(2) - Physics 15a Midterm Exam #2,...

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Physics 15a Midterm Exam #2, 4/24/08 1. Consider the following one-dimensional collision. A mass 4 m moves to the right, and a mass m moves to the left, both with speed v . They collide elastically. Find their final lab-frame velocities. Solve this by: (a) Working in the lab frame. (b) Working in the CM frame. 2. (Relativity) A stick with proper length L moves to the right with speed v toward a person standing at rest on the ground. A light source is attached to the left end of the stick. In the ground frame, the light source emits a photon (aimed at the person) at the same instant (as measured in the ground frame) that the right end of the stick passes the person. The photon eventually reaches the person. By working in the stick frame , find the distance (as measured in the stick frame) between the person and the left end of the stick at the instant the person meets the photon. v 3. (Relativity) Pions (with mass m π ) are particles that are produced copiously in particle physics experiments. A pion decays into one muon (with mass
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08_spring_midterm2(2) - Physics 15a Midterm Exam #2,...

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