Register to reply

Elasticity,stress, and strain questions

by defdek
Tags: elasticity, strain, stress
Share this thread:
defdek
#1
Oct10-10, 04:56 AM
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
1/2Y(strain)^2 ?
Phys.Org News Partner Science news on Phys.org
Fungus deadly to AIDS patients found to grow on trees
Canola genome sequence reveals evolutionary 'love triangle'
Scientists uncover clues to role of magnetism in iron-based superconductors
nvn
#2
Oct14-10, 12:28 AM
Sci Advisor
HW Helper
P: 2,124
(1) Excellent work, defdek. Your answer on question 1 is correct.

(2) Nice work on question 2. That is correct.

(3) <standing ovation. crowd roars.> Nice job on question 3. That is correct.


Register to reply

Related Discussions
Elasticity,stress, and strain questions Introductory Physics Homework 2
Stress / strain - pt2 Introductory Physics Homework 12
Load, elasticity, strain, strength Engineering, Comp Sci, & Technology Homework 1
Stress and strain Introductory Physics Homework 2
Stress and Strain Introductory Physics Homework 20