58_Physics ProblemsTechnical Physics

58_Physics ProblemsTechnical Physics - Chapter 3 P3.11 (a)...

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Chapter 3 59 P3.11 (a) di =− = 10 0 10 0 . ± . m since the displacement is in a straight line from point A to point B. (b) The actual distance skated is not equal to the straight-line displacement. The distance follows the curved path of the semi-circle ( ACB ). sr == = 1 2 25 1 5 7 ππ bg . m C B A 5.00 m d FIG. P3.11 (c) If the circle is complete, d begins and ends at point A . Hence, d = 0. P3.12 Find the resultant FF 12 + graphically by placing the tail of F 2 at the head of F 1 . The resultant force vector + is of magnitude 95 . N and at an angle of 57 ° above the -axis x . 0 1 2 3 N x y F 2 F 1 F 1 F 2 + FIG. P3.12 P3.13 (a) The large majority of people are standing or sitting at this hour. Their instantaneous foot-to- head vectors have upward vertical components on the order of 1 m and randomly oriented
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