14 of 20-/5View PoliciesCurrent Attempt in ProgressA tunnel of length L = 110 m, height H = 5.4 m, andwidth 8.6 m (with a flat roof) is to be constructed atdistance d = 79 m beneath the ground. (See thefigure.) The tunnel roof is to be supported entirely by%3Dsquare steel columns, each with a cross-sectionalarea of 1190 cm². The mass of 1.0 cm³ of the groundmaterial is 3.7 g. (a) What is the total weight of theground material the columns must support? (b) Howmany columns are needed to keep the compressivestress on each column at one-half its ultimatestrength?II

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Answered: Current Attempt in Progress A tunnel of…

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