homework_3

# homework_3 - two sets of graphs one above the other with...

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Physics 112 Homework #3 Fall 2006 Read: Chapter 3, sections intro. + 3.1 - 3.4 For discussion: Chapter 3: Q's #Q3.1, Q3.2, Q3.3, Q3.6, Q3.7, Q3.8, Q3.9, Q3.10, Q3.11, Q3.12, Q3.13 E's & P's #3.29, 3.35, 3.49, 3.51, 3.53, 3.57. 3.67, 3.71 Due Friday, Sept. 15 at lecture: #3.9 [Basic Projectile] #3.33 and 3.34 [Circular Motion] #3.73 [Projectile Motion Graphs] #3.75 [Uniform Circular Motion in X-Y Components] #1. (truck + police car v vs. t graph) A car traveling at a steady speed of 15 m/s enters a 10 m/s speed-limit zone without slowing down. A police officer pursues the car by starting from rest, accelerating with constant acceleration of 2.5 m/s 2 until reaching a speed of 20 m/s, and then slowing down with constant acceleration until reaching a speed of 15 m/s while catching up with the car at the same time. (a) Graph the motions of the two vehicles carefully as positions vs. time on the same axes and as velocities vs. time on another set of axes. Please arrange your

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Unformatted text preview: two sets of graphs one above the other with time axes synchronized, and mark the time when the police officer begins to slow down. (b) At what time after starting from rest does the officer reach the car? How far has each vehicle traveled? [HINT: Use your velocity graphs to solve this part.] (c) What was the officer's acceleration while slowing down? Name 2. [Tapping a Rolling Ball] In the figure at the right is shown a strobe photograph of a ball rolling on a horizontal table. The image marked with a heavy arrow occurs at time t = 0 and the ball moves to the right at that instant. Each image of the ball occurs 1/30 s later than the one immediately to its left. On the graphs below, using the coordinate system shown in the figure, sketch qualitatively accurate (i.e., we don't care about the values but we do about the shape) graphs of each of the indicated variables. The time at which the "kink" in the path occurs is t = t1. a x a y...
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homework_3 - two sets of graphs one above the other with...

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