Physics, 08.07.2019 12:00, aliceotter2007
Alift is used to lower miners 5500m into a mine. the lift is supported by a cable made of many high strength steel strands of 6mm diameter each and was designed with a factor of safety of 2.00; the ultimate stress for steel strands is 1300 mpa and the allowable stress is 650 mpa. the empty lift weighs 16 kn and has a capacity of 20 persons. assume that the density of steel is 77 kn/m^3 and average weight of one person is 850n. a) calculate the number of strands required to support the lift. b) what is the max depth to which the lift can be lowered before the cable snaps?
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