7.0 kg is hung from a steel wire of diameter 0.75 mm and length 2.5 meters. (S = 8.2 × 1010 N/m2; Y = 20 × 1010 N/m2)

(a) By how much does the wire stretch?
(b) If the wire diameter were doubled, what would be the stretch?


(a) 1.9 mm
(b) 0.49 mm

Physics & Space Science

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