A 76.5 kg cross-country skier skiing on unwaxed skis along dry snow at a constant speed of 4.00 m/s experiences a force of friction of -60.0 N. What is the coefficient of friction between unwaxed skis and dry snow?
a. 0.08
b. 0.78
c. 1.28
d. 12.5

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11-07-2014
Physics

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A 76.5 kg cross-country skier skiing on unwaxed skis along dry snow at a constant speed of 4.00 m/s experiences a force of friction of -60.0 N. What is the coefficient of friction between unwaxed skis and dry snow?
a. 0.08
b. 0.78
c. 1.28
d. 12.5

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AL2006idn AL2006idn · Answer 1 · 2014-07-16T18:17:23-04:00

AL2006idn AL2006idn

16-07-2014

The force of friction = (weight) x (coefficient of friction)

Skier's weight = (mass) x (gravity) = (76.5) x (9.8) = 749.7 N

Force of friction = (749.7) x (coefficient of friction) = 60.0 N

Coefficient of friction = 60 / 749.7 = 0.08 (rounded)

Choice-'A' is the closest choice offered.

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