Asked by Anon

A car with its brakes locked will remain stationary on an inclined plane of dry concrete when the plane is at an angle of less than 45 degrees with the horizontal. What is the coefficients of static friction of rubber tires on dry concrete
Answered by bobpursley
forcefriction=forcegravity down street.

mu*mg*cosTheta=mg*sinTheta
mu=tanTheta
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