# physics

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A 15kg box is resting on a hill forming an angle of a horizontal surface. The coefficient of static friction for the box on the surface is 0.45. Calculate the maximum angle of the incline just before the box starts to move.

• physics -

Let A be the angle.

Friction force = Weight component down incline

M g * cos A * 0.45 = M g sinA

solve for A.
Mg cancels out. (Use arctangent function)

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27

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