1173137327 - HW Chapter 3 3.3 A web page designer creates...

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HW Chapter 3 3.3 A web page designer creates an animation in which a dot on a computer screen has a position of r = [4.0 cm + (2.5 cm/s 2 ) t 2 ] i + (5.0 cm/s)t j . a) Find the magnitude and direction of the dot’s average velocity between t = 0 and t = 2 s. b) Find the magnitude and direction of the instantaneous velocity at t = 0, t = 1.0 s, and t = 2.0 s. c) Sketch the dot’s trajectory from t = 0 to t = 2.0 s, and show the velocities calculated in part (b). 3.12 A daring 510-N swimmer dives off a cliff with a running horizontal leap, as shown in Fig. 1. What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff? Fig. 1 3.19 A major league hits a baseball so that it leaves the bat at a speed of 30 m/s and at an angle of 36.9 ° above the horizontal. You can ignore air resistance. a) At what two times is the baseball at a height of 10.0 m above the point at which it left the bat? b) Calculate the
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1173137327 - HW Chapter 3 3.3 A web page designer creates...

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