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a box of 5kg lies on a ramp of inclination 30degrees. Calculate the maximum static friction force needed to keep the box stationary

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the normal force is...5 g cos(30º)

the force along the ramp is
... 5 g sin(30º)

5 g sin(30º) = μ 5 g cos(30º)

sin(30º) / cos(30º) = tan(30º) = μ

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