A uniform 20 30-in. steel plate ABCD weighs 85 lb and is attached to ball-and-socket joints

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A uniform 20 × 30-in. steel plate ABCD weighs 85 lb and is attached to ball-and-socket joints at A and B. Knowing that the plate leans against a frictionless vertical wall at D, determine

(a) The location of D,

(b) The reaction at D.



A uniform 20 × 30-in. steel plate ABCD weighs 85 lb and

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