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A box of mass m = 2.00 kg is positioned on a ramp at an angle...

A box of mass m = 2.00 kg is positioned on a ramp at an angle θ. The length of the ramp (minus the width of the base of the box) is d = 3.00 m. The surface of the ramp has a coefficient of static friction μs = 0.500 and a coefficient of kinetic friction μk = 0.350. The angle θ is slowly increased until the box starts to slide down the ramp.

Calculate the angle θmax at which the static friction force on the box is maximum.

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