A 20 mm diameter mild steel rod is chosen for the construction work according to the calculation results. The weight of the above rod per meter length will be
1). 0.75 kg
2). 1.45 kg
3). 2.50 kg
4). 3.99 kg
One cubic meter of mild steel weights about 7850 kg.
Therefore,
weight of the rod = volume of the rod × density of the material
weight of the rod = Cross – section of the rod × length of the rod × density of the material
Weight of the rod $(= {\rm{\;}}\frac{\pi }{4} \times {\left( {\frac{{20}}{{1000}}} \right)^2} \times 1 \times 7850 = 2.47\;{\rm{kg}})$1. The portion of the building between the ground level and the ground floor is called
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