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You are working as a letter sorter in a U.S Post Office. Postal regulations require that employees' footwear must have a minimum coefficient of static friction of 0.5 on a speci- fied tile surface. You are wearing athletic shoes for which you do not know the coefficient of static friction. In order Screen Shot 2020-10-21 at 01.48.25 Q Search to determine the coefficient, you imagine that there is an emergency and start running across the room. You have a coworker time you, and find that you can begin at rest and move 4.23 m in 1.20 s. If you try to move faster than this, your feet slip. Assuming your acceleration is constant, does your footwear qualify for the postal regulation?

You are working as a letter sorter in a U.S Post Office. Postal regulations require that employees' footwear must have a minimum coefficient of static friction of 0.5 on a speci- fied tile surface. You are wearing athletic shoes for which you do not know the coefficient of static friction. In order Screen Shot 2020-10-21 at 01.48.25 Q Search to determine the coefficient, you imagine that there is an emergency and start running across the room. You have a coworker time you, and find that you can begin at rest and move 4.23 m in 1.20 s. If you try to move faster than this, your feet slip. Assuming your acceleration is constant, does your footwear qualify for the postal regulation?

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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..where does the "2" underlined in red come from?

2. You are working as a letter sorter in a U.S Post Office. Postal R regulations require that employees' footwear must have a minimum coefficient of static friction of 0.5 on a speci- fied tile surface. You are wearing athletic shoes for which you do not know the coefficient of static friction. In order |Screen Shot 2020-10-21 at 01.48.25 Q Search to determine the coefficient, you imagine that there is an emergency and start running across the room. You have a coworker time you, and find that you can begin at rest and move 4.23 m in 1.20 s. If you try to move faster than this, your feet slip. Assuming your acceleration is constant, does your footwear qualify for the postal regulation?
Transcribed Image Text:2. You are working as a letter sorter in a U.S Post Office. Postal R regulations require that employees' footwear must have a minimum coefficient of static friction of 0.5 on a speci- fied tile surface. You are wearing athletic shoes for which you do not know the coefficient of static friction. In order |Screen Shot 2020-10-21 at 01.48.25 Q Search to determine the coefficient, you imagine that there is an emergency and start running across the room. You have a coworker time you, and find that you can begin at rest and move 4.23 m in 1.20 s. If you try to move faster than this, your feet slip. Assuming your acceleration is constant, does your footwear qualify for the postal regulation?
Friction force is responsible for acceleration so we can use second Newton low: F = umg = ma We can calculate acceleration: 2s 2.4.23 a = 5.875 12 1.22 now we get: a 5.875 gu = a → u = – = 9.81 H= 0,59 Footwear is qualify for the postal regulation.
Transcribed Image Text:Friction force is responsible for acceleration so we can use second Newton low: F = umg = ma We can calculate acceleration: 2s 2.4.23 a = 5.875 12 1.22 now we get: a 5.875 gu = a → u = – = 9.81 H= 0,59 Footwear is qualify for the postal regulation.
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