physics
posted by colleen .
A circular steel wire 2.00 m is to stretch no more than 0.25 cm when a tensile force of 400 N is applied to each end of wire. What minimum diameter is required for the wire?

physics 
Damon
area = pi d^2/4
length = 2 m
change in length = .0025 m
change in length/length = .0025/2
= tensile stress/E = 400/(pi d^2/4 E)
so
.00125 = 400/ (pi d^2/4 E)
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