A tunnel of length \( L=200 \mathrm{~m} \), height \( H=7.2 \mathrm{~m} \), and width \( 6.3 \ma... VIDEO
A tunnel of length \( L=200 \mathrm{~m} \), height \( H=7.2 \mathrm{~m} \), and width \( 6.3 \mathrm{~m} \) (with a flat roof) is to be constructed at distance \( d=70 \mathrm{~m} \) beneath the ground (Fig. ). The tunnel roof is to be supported entirely by square steel columns, each with a cross-sectional area of \( 960 \mathrm{~cm}^{2} \). The mass of \( 1.0 \mathrm{~cm}^{3} \) of the ground material is \( 2.8 \mathrm{~g} \). What is the total weight of the ground material the columns must support?https://bit.ly/YTAI_PWAP https://www.pw.live
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