How do i find the coefficient of friction

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adorrea
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Homework Statement



A block begins to slide down a ramp after being elevated to an angle of 53.75 degrees. What is the coefficient of static friction?

Homework Equations





The Attempt at a Solution

 
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What formulas do you know regarding incline planes and friction?
 
normal force=m*g*sin of angle and net force= m*g* cos of angle
 
will i have to find the mass of the block first