The ladder shown is supported by a horizontal floor and a vertical wall. It is 12 ft long,...

The ladder shown is supported by a horizontal floor and a vertical wall. It is 12 ft long, weighs 30 lb (assumed to be concentrated at its midlength), and supports a person weighing 175 lb at point D. The vertical wall is smooth and offers no frictional resistance. The coefficient of static friction at point A is 0.30. Calculate the minimum angle θ at which the ladder will stand without slipping to the left.

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