An 18-ton industrial elevator is supported by a standard steel cable of 3 in.2 cross section and an effective modulus of elasticity of 12 * 106 psi. As the elevator is descending at a constant 500 ft. /min, an accident causes the top of the cable, 80 ft. above the elevator, to stop suddenly. Estimate the maximum elongation and maximum tensile stress developed in the cable.

An 18-ton industrial elevator is supported by a standard steel cable of 3 in.2 cross section and an effective modulus of elasticity of 12 * 106 psi. As the elevator is descending at a constant 500 ft. /min, an accident causes the top of the cable, 80 ft. above the elevator, to stop suddenly. Estimate the maximum elongation and maximum tensile stress developed in the cable.

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