Question #d640c

1 Answer
Oct 5, 2016

Answer:

C

Explanation:

Young's Modulus: #\lambda stackrel \text{def} = {text{stress}}/{text{strain}} = sigma/epsilon#

#epsilon = (Delta L)/(L), quad sigma = (F)/(A)#

A circular cross-section, but there are 2 of them so #A = (pi D^2)/2#

#implies lambda = ((F)/(A))/((Delta L)/(L)) = (F L)/(A Delta L )#

#= (2 F L)/(( pi D^2) Delta L )#

#= (2 (80g) (10))/(( pi 0.005^2)(0.001) ) implies C#!!