Posted by Elisa on Monday, July 21, 2008 at 11:19pm.
Determine the elongation of the rod in if it is under a tension of 5.7E10^3 N.
The rod is made of aluminum and copper. From the aluminum to the copper section it measures 1.3m and from the copper section to the end it measures 2.6m with a radius of 0.2cm.
Can someone please help, I honestly don't know where to begin.
physics - drwls, Tuesday, July 22, 2008 at 1:15am
Add the elongations of the aluminum and copper sections. The elongation of each is
delta L = L * T/(AY)
Where L is the length of that material, A is the cross sectional area and Y is Young's modulus, which you will have to look up.
L = 2.6 m
A = (pi)*(2*10^-3 m)^2
Your text should have Young's modulus values for aluminum and copper; otherwise try googling it.
physics - drwls, Tuesday, July 22, 2008 at 1:19am
You can find Young's modulus values for many materials, including copper and aluminum, at
It is represented by the symbol E there, not Y.
For copper is it about 120* 10^9 N/m^2 .
They use the units of GigaPascals (GPa), which is 10^9 N/m^2.
physics - Elisa, Tuesday, July 22, 2008 at 8:39am
Thank you very much!
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