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OpenStudy (anonymous):
A 25kg box rests without sliding on a loading ramp at an angle of 30 degrees. What is the coefficient of friction between the box and the ramp? I know the answer is .58 but I'm not sure how to do this.
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OpenStudy (mathmate):
If the box is at the point of slipping, then the coefficient of friction is equal to tangen(theta)=tan(30)=0.577. However, the coefficient of friction can be > 0.577 if we only know that the box does NOT slip. In other words, the MIN coef. of friction is 0.577.
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