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22. (II) A constant force F = (2.0i + 4.0j) N acts on an object as it moves along a straight-line path. If the object's displace- ment is d = (1.0i + 5.0j) m, calculate the work done by F using these alternate ways of writing the dot product: (a) W = Fd cos 0; (b) W = Fxdx + Fydy. %3D 65. (II) At an accident scene on a level road, investigators measure a car's skid mark to be 98 m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (Why does the car's mass not matter?) 5. (II) A 1.60-m tall person lifts a 1.95-kg book off the ground so it is 2.20 m above the ground. What is the potential energy of the book relative to (a) the ground, and (b) the top of the person's head? (c) How is the work done by the person related to the answers in parts (a) and (b)? There is one more question on the next page. /2 v

22. (II) A constant force F = (2.0i + 4.0j) N acts on an object as it moves along a straight-line path. If the object's displace- ment is d = (1.0i + 5.0j) m, calculate the work done by F using these alternate ways of writing the dot product: (a) W = Fd cos 0; (b) W = Fxdx + Fydy. %3D 65. (II) At an accident scene on a level road, investigators measure a car's skid mark to be 98 m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (Why does the car's mass not matter?) 5. (II) A 1.60-m tall person lifts a 1.95-kg book off the ground so it is 2.20 m above the ground. What is the potential energy of the book relative to (a) the ground, and (b) the top of the person's head? (c) How is the work done by the person related to the answers in parts (a) and (b)? There is one more question on the next page. /2 v

College Physics
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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22. (II) A constant force F = (2.0i + 4.0j) N acts on an object as it moves along a straight-line path. If the object's displace- ment is d = (1.0i + 5.0j) m, calculate the work done by F using these alternate ways of writing the dot product: (a) W = Fd cos 0; (b) W = Fxdx + Fydy. %3D 65. (II) At an accident scene on a level road, investigators measure a car's skid mark to be 98 m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (Why does the car's mass not matter?) 5. (II) A 1.60-m tall person lifts a 1.95-kg book off the ground so it is 2.20 m above the ground. What is the potential energy of the book relative to (a) the ground, and (b) the top of the person's head? (c) How is the work done by the person related to the answers in parts (a) and (b)? There is one more question on the next page. /2 v
Transcribed Image Text:22. (II) A constant force F = (2.0i + 4.0j) N acts on an object as it moves along a straight-line path. If the object's displace- ment is d = (1.0i + 5.0j) m, calculate the work done by F using these alternate ways of writing the dot product: (a) W = Fd cos 0; (b) W = Fxdx + Fydy. %3D 65. (II) At an accident scene on a level road, investigators measure a car's skid mark to be 98 m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (Why does the car's mass not matter?) 5. (II) A 1.60-m tall person lifts a 1.95-kg book off the ground so it is 2.20 m above the ground. What is the potential energy of the book relative to (a) the ground, and (b) the top of the person's head? (c) How is the work done by the person related to the answers in parts (a) and (b)? There is one more question on the next page. /2 v
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