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r =0,5d=0,5 . 2mm=1 mm
A=πr2=
L=6m
m=4kg
F=w=mg=4 . 10=40 N
E=
E=σ/e=(F/A)/(ΔL/L)
E=FL/AΔL
ΔL=FL/EA
ΔL=
ΔL=
ΔL=
ΔL=0,764 mm