259_Physics ProblemsTechnical Physics

259_Physics ProblemsTechnical Physics - Chapter 9*P9.27(a...

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Chapter 9 261 *P9.27 (a) Using conservation of momentum, p p = c h c h after before , gives 4 0 10 3 0 4 0 5 0 10 3 0 3 0 4 0 . . . . . . . + + = + + a f b gb g b gb g b gb g kg kg m s kg m s kg m s v . Therefore, v = + 2 24 . m s , or 2 24 . m s toward the right . (b) No . For example, if the 10-kg and 3.0-kg mass were to stick together first, they would move with a speed given by solving 13 10 3 0 3 0 4 0 1 kg kg m s kg m s b g b gb g b gb g v = + . . . , or v 1 1 38 = + . m s. Then when this 13 kg combined mass collides with the 4.0 kg mass, we have 17 13 1 38 4 0 5 0 kg kg m s kg m s b g b gb g b gb g v = + . . . , and v = + 2 24 . m s just as in part (a). Coupling order makes no difference. Section 9.4 Two-Dimensional Collisions P9.28 (a) First, we conserve momentum for the system of two football players in the x direction (the direction of travel of the fullback). 90 0 5 00 0 185 . . cos kg m s kg b gb g b g + = V θ where θ is the angle between the direction of the final velocity
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