The amount of stretch is STRAIN not stress, and is irrelevant here.
The STRESS is load divided by cross section area.
diameter = 0.006 meters
so radius = 0.003 meters
stress = 400 Newtons / [pi(0.003)^2 meters^2]
A wire of length 15.0 metre and diameter 6.0 mm extended by 0.5 mm when a force of 400 Newton was used to stretch it from its end calculate the stress on the wire.
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