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# HW8 - Physics 105 Mechanics Fall 2009 Homework 8 Due Friday...

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Physics 105: Mechanics Fall 2009 Homework 8 Due Friday 10/30 Read sections 6.1 - 6.11 the text. Do the following problems. 1. Do 5.P.73. 2. Do 5.P.75. 3. Do 5.P.76. 4. Do 6.P.44. 5. Do 6.P.46. 6. Do 6.P.53. 7. Do 6.P.59. 8. (a) Draw an energy graph for the following situation: two protons start out far apart, moving toward each other (i.e., their initial velocities are non-zero). Your graph should include a curve representing the potential energy of the 2-proton system (U), the kinetic energy of the 2-proton system (K), and K+U of the system. (b) Draw an energy graph for the following situation: a proton and an electron start out far apart, moving toward each other (i.e., their initial velocities are non-zero). Your graph should include a curve representing the potential energy of the 2-particle system (U), the kinetic energy of the 2-particle system (K), and K+U of the system. 9. In a fusion reaction, the nuclei of the atoms join to form a single atom of a different element. In such a reaction, a fraction of the rest energy of the original atoms is converted to kinetic energy of the reaction products. A fusion reaction that occurs in the Sun converts hydrogen to helium. Since

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