Rod is circular in shape. If u look it from where it starts, i.e. its cross sectional view it will be circular. It may or may not be hollow.
Bar's cross sectional view will be a quadrilateral.
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Bright steel bars are grinded and have better finish otherwise it is same as other alloy steel
the rod will be stronger, but will break, the cable will bend under force, but not break. the rod has more tensile and shear strength.
=D^((D^2/162) L) D^2 = Diameter of the rod L = Length of the rod
Heat the plate then, insert the rod. Hole in plate slightly smaller than rod.
Yes
16 m m steel rod weight per meter = 1.5816 m m steel rod of 12metres weights = 12 * 1.58 = 18.96 kg