78_Physics ProblemsTechnical Physics

78_Physics ProblemsTechnical Physics - 4 Motion in Two...

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4 CHAPTER OUTLINE 4.1 The Position, Velocity, and Acceleration Vectors 4.2 Two-Dimensional Motion with Constant Acceleration 4.3 Projectile Motion 4.4 Uniform Circular Motion 4.5 Tangential and Radial Acceleration 4.6 Relative Velocity and Relative Acceleration Motion in Two Dimensions ANSWERS TO QUESTIONS Q4.1 Yes. An object moving in uniform circular motion moves at a constant speed, but changes its direction of motion. An object cannot accelerate if its velocity is constant. Q4.2 No, you cannot determine the instantaneous velocity. Yes, you can determine the average velocity. The points could be widely separated. In this case, you can only determine the average velocity, which is v x = t . Q4.3 (a) a a a a v v v v (b) a a v v a v a v a v Q4.4 (a) 10 m s ± i (b) 980 . m s 2 ± j Q4.5 The easiest way to approach this problem is to determine acceleration first, velocity second and
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