Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN: 9781305116399

Author: Raymond A. Serway, John W. Jewett

Publisher: Cengage Learning

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One strategy in a snowball fight is to throw a snowball at a high angle over level ground. Then, while your opponent is watching that snowball, you throw a second one at a low angle timed to arrive before or at the same time as the first one. Assume both snowballs are thrown with a speed of 25.0 m/s. The first is thrown at an angle of 70.0 with respect to the horizontal. (a) At what angle should the second snowball be thrown to arrive at the same point as the first? (b) How many seconds later should the second snowball be thrown after the first for both to arrive at the same time?

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A pirate has buried his treasure on an island with five trees located at the points (30.0 m, 20.0 m), (60.0 m, 80.0 m). (10.0 m, 10.0 m), (40.0 m, 30.0 m), and (70.0 m, 60.0 m), all measured relative to some origin, as shown in Figure P3.46. His ships log instructs you to start at tree A and move toward tree B, but to cover only one-half the distance between A and B. Then move toward tree C, covering one-third the distance between your current location and C. Next move toward tree D, covering one-fourth the distance between where you are and D. Finally move toward tree E, covering one-fifth the distance between you and E, stop, and dig. (a) Assume you have correctly determined the order in which the pirate labeled the trees as A, B, C, D, and E as shown in the figure. What are the coordinates of the point where his treasure is buried? (b) What If? What if you do not really know the way the pirate labeled the trees? What would happen to the answer if you rearranged the order of the trees, for instance, to B (30 m, 20 m), A (60 m, 80 m), E (10 m, 10 m), C (40 m, 30 m), and D (70 m, 60 m)? State reasoning to show that the answer does not depend on the order in which the trees are labeled. Figure P3.46

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A rescue plane flies at 198 km/hr (55 m/s) at cruise height of 500m above the ocean over a struggling swimmer the pilot needs to release a rescue capsule so that it hits the water close to the swimmer
What should the angle of the pilot's line of sight of the swimmer when the capsule is released?

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How so I deterred the maximum angle a with the vertical ?

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A fire hose held near the ground shoots water at a speed of 5.9 m/sm/s.
At what angle(s) should the nozzle point in order that the water land 2.5 mm away?
Express your answer(s) in degrees to two significant figures. If there is more than one answer, separate them by a comma.

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a heavy piece ofmachinery is raised by sliding it adistance d 12.5 m along a plankoriented at angle u 20.0° to thehorizontal. How far is it moved (a)vertically and (b) horizontally?

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You and your dog go for a walk to the park. On the way, your dog takes many side trips to chase Squirrels or examine fire hydrants. When you arrive at the park,do you and your dog have the same displacement?

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Rain is falling vertically downward and you are running for shelter. To keep driest, should you hold your umbrella vertically, tiltedforward, or tilted backward? Explain.

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A woman on a ground sees an airplane climbing at an angle of 35° above the horizontal. She gets into her car and by driving at 70mi/h is able to stay directly below the plane. What is the airplane speed?

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An object is projected at an angle of 60o with the horizontal with an initial velocity of 15 m/s. What is the maximum height reached by the object?

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a body is projected with velocity 100m/s at an angel 30 with the horizontal. the maximum height attained by the body is?

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(II) Determine the speed of the boat with respect to theshore in Example 3–10.

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