Ch5 HW1 - Ch5 HW1...

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BRANDON JARROTT FELDKAMP PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 17 out of 20 Due: Monday, September 29, 2008 09:00 AM 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 0.918 c (that is, | |/ c = 0.918 ), what are the following values? total energy ("particle energy") = 2.04e-13 2.04e-13 J rest energy = 8.09e-14 8.10e-14 J kinetic energy = 1.23e-13 1.23e-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 m/s. What is the kinetic energy of the runner? K = 1.23e3 1220 J Ch5 HW1 http://www.webassign.net/[email protected]/student.pl?z=2008. .. 1 of 4

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Ch5 HW1 - Ch5 HW1...

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