A cable used to lift heavy materials like steel I-beams must be strong enough to resist breaking even under a load of 1.7  106 N. For safety, the cable must support twice that load. (a) What cross-sectional area should the cable have if it's to be made of steel?   (b) By how much will a 7.0-m length of this cable stretch when subject to the 1.7  106-N load?

Question

A cable used to lift heavy materials like steel I-beams must be strong enough to resist breaking even under a load of 1.7  106 N. For safety, the cable must support twice that load.

(a) What cross-sectional area should the cable have if it's to be made of steel?
 
(b) By how much will a 7.0-m length of this cable stretch when subject to the 1.7  106-N load?

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