Question: Sample Problem 4 . 7 A 2 0 - k g ladder used to reach high shelves in a storeroom is supported by two flanged

Sample Problem 4.7
A 20-kg ladder used to reach high shelves in a storeroom is supported by two flanged wheels A and B mounted on a rail and by a flangeless wheel C resting against a rail fixed to the wall. (The ladder itself is symmetric, with wheel C located on the plane of symmetry.) An 80-kg man stands on the ladder and leans to the right. The line of action of the combined weight W of the man and ladder intersects the floor at point D. Determine the reactions at A,B, and C.
STRATEGY: Draw a free-body diagram of the ladder, then write and solve the equilibrium equations in three dimensions.
MODELING:
Sample Problem 4 . 7 A 2 0 - k g ladder used to

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