College Algebra

10th Edition

ISBN: 9781337282291

Author: Ron Larson

Publisher: Cengage Learning

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Question

During the construction of a high-rise building, a worker accidentally dropped his portable electric screwdriver from a height of 576 ft. After t sec, the screwdriver had fallen a distance of

s = 16t2 ft. How long did it take the screwdriver to reach the ground? What was the average velocity of the screwdriver between the time it was dropped and the time it hit the ground?

What was the velocity of the screwdriver at the time it hit the ground?

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A shaft is turned in a lathe at 120 revolutions per minute. The cutting tool advances 0.030 inch per revolution. How bong is the length of cut along the shaft at the end of 3.50 minutes?

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The kinetic energy E of an object varies jointly with the object’s mass m and the square of the object’s velocity v . An object with a mass of 50 kilograms traveling at 16 meters per second has a kinetic energy of 6400 joules. What is the kinetic energy of an object with a mass of 70 kilograms traveling at 20 meters per second?

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