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m= 4kg,l=20m or 20000mm ,∆l=0.031,g=3.1π
F= mg= 4×3.1π
Y= F×l/πrr×∆l
4×3.1π×20000/π ×2.0×2.0×0.031 =20000÷0.031=0.75approx
F= mg= 4×3.1π
Y= F×l/πrr×∆l
4×3.1π×20000/π ×2.0×2.0×0.031 =20000÷0.031=0.75approx
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