Skid Marks and Traffic Wreck InvestigationsA person driving on I-82 glanced at his phone to read a very important text message. When helooked back up at the road, he saw that the traffic ahead had come to a standstill and he immediatelyslammed on his brakes. His car created 96.5 m long skid marks before rear-ending another car.Unfortunately, a passenger in the rear-ended car was seriously injured, thus requiring aninvestigation by the State Patrol. The State Patrol has no proof of distracted driving, however theywant to determine if a citation for speeding should be issued.A State Patrol investigator used a 3.9 kg drag sled to determine the coefficient of kinetic frictionbetween the road and the tires of the car. The drag sled's spring scale read 28 N when it was pulledalong the ground at a constant speed.Use Newton's Second Law and kinematics to estimate the minimum value of the car's speed whenthe driver locked the brakes. (answer: about 83 mi/hr)Note: You do not need the mass of the car to answer this question.FNETf = HNW = mgg = 9.81 m/s?= ma%3Dv² = v,² + 2aAx1 mi/hr = 0.45 m/s%3D

Given Displacement S = 96.5 m Final velocity v = 0 m/s Drag sled mass m = 3.9 kg Drag sled Force Fr…

Answered: A person driving on I-82 glanced at his…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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In a laboratory test of tolerance for high acceleration, a pilot is swung in a circle 11.5 m in diameter. It is found that the pilot blacks out when he is spun at 30.6 rpm (rev/min). At what acceleration (in SI units) does the pilot black out? Express this acceleration in terms of a multiple of g. If you want to decrease the acceleration by 13.0% without changing the diameter of the circle, by what percent must you change the time for the pilot to make one circle? acceleration: acceleration as a multiple of g: percent of time change: m/s² %
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A commercial airliner with four jet engines, each producing 88 kN of forward thrust, is in a steady, level cruise when engine number 3 suddenly fails. Determine the distance d (measured up or down on the figure) to the resultant of the three remaining engine thrust vectors. Treat this as a two-dimensional problem. The distance d is positive if above the center line of the airplane, negative if below. 4 88 KN € t 8.8 m 14.1 m 14.1 m 8.8 m Y 88 KN 88 KN Answer: d = i
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Elon Musk’s SpaceX is proposing that commercial flights will be ready to go to the Moon in less than three years. Yusaku Maezawa, a Japanese billionaire, is seeking eight artists to join his trip to the Moon. He wants them to inspire everyone by creating artwork after they return to Earth. The acceleration due to gravity on the surface of the Moon is 16.6% of the acceleration due to gravity on Earth. To keep the artists comfortable, it is decided that as they lift off from the Moon, the acceleration they experience close to the surface of the Moon should be kept to the equivalent of 2.83 g (1?is the acceleration due to gravity on the surface of the Earth). What is the maximum thrust that one of the new rockets from Part 2 can withstand under this condition? Note: The weight of the artists is negligible compared to the weight of the rocket (given in part 2), so you can ignore it in your calculations!
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