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# HW_3 - P1112 Fall 2008 Homework#3 due week 3(at your second...

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P1112 Fall 2008 Homework #3, due week 3 (at your second section) Reading: 3.4, 4.1-4.2, 5.5, 12.1 Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Problems: 1. A tennis ball rolls off the edge of the table 0.750 m above the floor and strikes the floor at a point 1.40 m horizontally from the edge of the table. You can ignore air resistance. a) Find the time of flight. Ans: 0.39 s b) Find the magnitude of the initial velocity. c) Find the magnitude and the direction of the velocity of the ball just before it strikes the floor. Ans: 47 deg down from horizontal d) Draw x-t, y-t, v x -t and v y -t graphs for the motion. 2. You are riding a motorboat on a 100 m wide river. The boat's speed relative to the river is constant at 6.0 m/s, while the river flows at 2.0 m/s relative to the shore. For each part below, please include a carefully drawn and labeled vector diagram. (a) In which directions should you point the boat to achieve maximum and minimum speeds relative to the shore?

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