Safe Working Load: Word Problem

The safe working load [b][i]S[/i][/b] (in tons) for a wire rope is a function of [b][i]D[/i][/b], the diameter of the rope in inches.[br][br] Safe working load model for wire rope: [math]4\cdot D^2=S[/math]
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What diameter of wire rope do you need to lift a 9-ton load and have a safe working load?
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