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20_Physics ProblemsTechnical Physics

20_Physics ProblemsTechnical Physics - 2 Motion in One...

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2 CHAPTER OUTLINE 2.1 Position, Velocity, and Speed 2.2 Instantaneous Velocity and Speed 2.3 Acceleration 2.4 Motion Diagrams 2.5 One-Dimensional Motion with Constant Acceleration 2.6 Freely Falling Objects 2.7 Kinematic Equations Derived from Calculus Motion in One Dimension ANSWERS TO QUESTIONS Q2.1 If I count 5.0 s between lightning and thunder, the sound has traveled 331 5 0 1 7 m s s km b ga f . . = . The transit time for the light is smaller by 3 00 10 331 9 06 10 8 5 . . × = × m s m s times, so it is negligible in comparison. Q2.2 Yes. Yes, if the particle winds up in the + x region at the end. Q2.3 Zero. Q2.4 Yes. Yes. Q2.5 No. Consider a sprinter running a straight-line race. His average velocity would simply be the length of the race divided by the time it took for him to complete the race. If he stops along the way to tie his shoe, then his instantaneous velocity at that point would be zero. Q2.6 We assume the object moves along a straight line. If its average
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