Question

The Young’s modulus for steel is 20.7*1010 N/m2. How much will a 2.5 mm diameter wire 12 cm long, be strained when it supports a load of 450 N? Aluminum’s Young’s modulus is 6.9*1010 N/m2.

Express the strain as a decimal, not a percentage

What diameter of aluminum wire would be strained the same amount?

Express your answer in mm:

Answer 1

I found the strain 5.23*10^-4
and the diameter 3.98 mm but it garded wrong even though i think that is true

Answer 2

same here... Strange...

Answer 3

I got the same solution...

Answer 4

Me too...

Answer 5

a) 4.4E-4
b)4.33 mm