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An object of mass 20kg slides down an inclined plane at an angle of 30 degree to the horizontal. The coefficient of static friction is?

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    If 30 degrees is the minimum angle that allows slipping to start, then the coefficient of static friction (mu_s) is given by

    M*g*sin30 = M*g*mu_s*cos30
    mu_s = tan30 = 0.5774

    The mass M does not matter.

    Angles greater than 30 degrees will also allow slipping.

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