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?

University Physics Volume 1
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Chapter6: Applications Of Newton's Laws
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Problem 76P: The CERN particle accelerator is circular with a circumference of 7.0 km. (a) What is the...
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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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