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Elasticity,stress, and strain questions

by defdek
Tags: elasticity, strain, stress
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defdek
#1
Oct9-10, 11:19 PM
P: 12
1. A 3.0-mm2 cross sectional area metal rod is stretched by 0.4 mm when a certain stretching force is applied to it. Another rod of the same length and metal but of a cross sectional of twice as large is stretched by the same amount of force. Calculate the stretching in the second wire.

the answer is 0.2mm? half stretch than the first rod?

2.Compute the strain energy stored in an aluminium wire of 2.0 m long, 1.0 mm diameter subjected to a 25.0-N tension. [Y-aluminium = 7.0 x 10^10 Nm-2].
i just have to use this formula right?
F^2L/2AY

3.A stretched wire has strain energy per unit volume of 4.00 x 10^3 Jm-3. Find the Young’s modulus and the stress in the wire if the wire elongates 0.5% of its original length.
i have no idea about this
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Precursor
#2
Oct9-10, 11:35 PM
P: 222
This probably belongs in the Engineering board.
nvn
#3
Oct14-10, 12:29 AM
Sci Advisor
HW Helper
P: 2,124
Please see duplicate thread at thread 436613.


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