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A ladder on a horizontal floor leans aga...

A ladder on a horizontal floor leans against a vertical wall. The coefficients of friction of the floor and the wall with the ground are `mu` and `mu_(1)` respectively. If a man, whose weight is n times that of the ladder, wants to climb up the ladder, the minimum safe angle of the ladder with the floor is `tan^(-1){(2n+1-mumu_(1))/(2mu(1+n))}`.

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