Asked by Laila
A lift cable which is 50m long ,is made from high tensile steel of Young Modulus 2.0x 10^11 Pa. the cable is made from 100 wires each of radius 2.0mm . Calculate the extra extension in the cable when 10 passengers pile into the lift ,the total mass of the passenger is 500kg .
Answers
Answered by
bobpursley
I think I would use Hooke's law here. Note the wires are in parallel, so the effective
Modulus is 100*2*E11 Nt/m^2, so
deltaL=FL/AE where F is force, L is length, A is area of each wire, and E is the modulus of Elasticity.
deltaL=500kg*9.8N/kg*50m/PI*(2E-3)^2*200E11N/m^2
check that.
Modulus is 100*2*E11 Nt/m^2, so
deltaL=FL/AE where F is force, L is length, A is area of each wire, and E is the modulus of Elasticity.
deltaL=500kg*9.8N/kg*50m/PI*(2E-3)^2*200E11N/m^2
check that.
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