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Chapter_14_problems_part_1

# Chapter_14_problems_part_1 - Chapter 15 Homework Problems...

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Chapter 15: Homework Problems 15-113 14.1 Going back to the Iron Man problem you encountered in Chapter 6 (problem 6.1), use the calculated value of T max to determine the acceleration that will be generated if Iron Man initiates maximum thrust in each boot (heading straight up). If he starts at 0 m/s and accelerates at this maximum rate, how high in the air will he be when he reaches a speed of 300 ft./s. Iron Man c and TM, Marvel Entertainment, LLC all rights reserved and used with permission. 14.2 Top fuel dragsters are some of the fastest accelerating vehicles on earth (and compare favorably with the space shuttle). After finishing their quarter-mile run, a parachute deploys and they come to a stop within a few seconds. As a result of the extreme deceleration, drivers have been known to detach their retinas. Just thought that might be interesting. For the purposes of this problem, assume that the dragster crosses the finish line at a top speed of 333 mph. a) If the acceleration is constant over the entire run, what is its magnitude? How long does it take the driver to complete the course? b) Assume that, after the dragster crosses the finish line, the engine cuts off and a parachute opens generating a drag force, F D = Av x . Draw a free body diagram of the dragster. c) If it takes 17.5 seconds for the dragster to reach 1/10 of its top speed, what is the value of the constant, A.

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15-114 Chapter 15: Homework Problems d) What is the peak magnitude of the acceleration experienced by the driver during the race?
Chapter 15: Homework Problems 15-115 14.3 The Battleship Missouri played an important role in the Battle of the Pacific during World War II and was the location of the official Japanese surrender. You may assume that the battleship weights 50,000 tons and that the water exerts a drag force of the form F = Av 2 , where A is a constant. We also know that, to keep the battleship moving at a constant speed of 40 ft./s , the propellers must generate a total thrust of 250,000 lbs. a) Determine the constant, A , where A is a constant with units of lbs. * s 2 /ft 2 . b) If the ship is traveling at 40 ft./s and the propellers are suddenly powered down, how far does it travel before it reaches a speed of 10 ft./s .

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15-116 Chapter 15: Homework Problems 14.4 Ermes Zamperla, a human cannonball, performed his stunt up to four times per day. In February of 2002, he miscalculated and, instead of landing on a cushion 75 ft. from the cannon, he actually traveled 100 ft., breaking both legs and bones in his back. If he takes off at an angle of 50 o , what was his initial velocity (you may neglect wind resistance). What should his initial velocity have been? What is the percent difference between the two? Would you consider launching yourself in this way?
Chapter 15: Homework Problems 15-117 14.5 The Mythbusters are led by Adam Savage and Jamie Hyneman (also including Tory Belleci, Kari Byron, Grant Imahara, Jessi Combs, and Buster). For some reason,

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