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f=40 Hz
l=5m
μ=0,5 gr/cm =0,0005 kg/m
dit: F..?
l=1λ
λ=5
jwb:
v=λ.f
=5.40
=200 m/s
F=v²μ
F=200² . 0,0005
F=40000.0,0005
F=80000000 N