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Math Help - Another question of Equilibrium and Gravity - this is a tough topic for me

  1. #1
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    Another question of Equilibrium and Gravity - this is a tough topic for me

    A wooden plank of uniform density is resting against a frictionless wall so that it makes an angle of θ to the ground as shown. What is the minimum value of the coefficient of friction, μ, between the ground and the plank in order to stop it slipping?

    [Enter the variable θ using the string 'theta' (no quotes).]
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  2. #2
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    not enough info. given.
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