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What is the size of bar which is needed to calculate its weight?
Weight/Cross sectional Area = 8000*10=80000 Kg/m2 =80 ton/m2
Lets consider bar is 25mm dia.
Cross Sectional Area = 0.025*0.025=0.000625 m2
Weight of 25mm dia 10m long bar = 80000*0.000625 = 50 Kg