Posted by courtney on Sunday, October 16, 2011 at 6:31pm.
Use density.
volume= Length*thickness*width
mass= density*volume
156kg=densitysteel*length*thickness*width
length= 156kg/(density*thickness*width)
look up density of steel. Watch units. thickenss is in mm,width is in cm, density will be in whateverunits.
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