the weight W kg of a metal bar varies jointly as it length L meters and the square of it diameter d mm. If W = 140, when d = 4 and L = 54, find d in terms of W and L.
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W∞LD2W=KLd2K=WLd2=14054×(423)2=14054×(143)2=140×954×14×14=542∴W=542Ld242W=5Ld242W5L=d2d=42W5L‾‾‾‾√
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