# Ch5 HW1 - WebAssign Ch5 HW1(Homework Current Score 14 out...

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Ch5 HW1 (Homework) Arthur Barfield PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 14 out of 20 Due: Tuesday, September 30, 2008 09:52 PM EDT Description Particle energy, rest energy, kinetic energy Instructions Reading: Sections 5.1-5.2 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2e 5.X.1e] 4/4 points An electron has mass 9e-31 kg. If the electron 's speed | | is 0.939 c (that is, | |/ c = 0.939 ), what are the following values? total energy ("particle energy") = 2.355e-13 2.36e-13 J rest energy = 8.1e-14 8.10e-14 J kinetic energy = 1.545e-13 1.55e-13 J Solution or Explanation The particle energy is The rest energy is The kinetic energy is the particle energy minus the rest energy: . 2. [MI2 05.X.01.01] 2/2 points A runner whose mass is 50 kg runs in the +x direction at a speed of 7.5 m/s. What is the kinetic energy of the runner?

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K = 1406 1410 J The runner turns around and runs in the -x direction at the same speed. Now what is the kinetic energy of the runner?
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