Question

Question #d640c

Answer 1

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`!!