Answered: 1.A person is pushing a box across a…

Name: 1.A person is pushing a box across a floor. Can the frictional force o
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Description: 1.A person is pushing a box across a floor. Can the frictional force on the box ever exceed its own weight? Can the frictional force ever exceed the applied force? Illustrate and solve the following problems. 2. A 500 – N box is pushed across a hor

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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1.A person is pushing a box across a floor. Can the frictional force on the box ever exceed its own weight? Can the frictional force ever exceed the applied force? Illustrate and solve the following problems. 2. A 500 – N box is pushed across a horizontal floor with a force of 250 N. The coefficient of kinetic friction is 0.40. (a) Find the work done in pushing the box 20 m. (b) How much work went into overcoming friction and how much into accelerating the box? 3. A 60-lb wooden box is pushed a distance of 50 ft on a horizontal stone floor by a force just sufficient to overcome the friction between box and floor. The coefficient of kinetic friction is 0.40. (a) What is the required force? (b) How much work does the force do? 4. A horizontal force of 5.0 N is used to push a box up a ramp 5.0 m long that is at an angle of 15° above the horizontal. How much work is done by the force? 5. A weightlifter raises a 150-kg barbell from the floor to a height of 2.2 m in 0.80 s. What is his average power output during the lift? 6. Find the kinetic energy of a 70-kg runner who covers 400 m in 45 s at constant speed.

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