# Calculation of strain

1. Sep 17, 2016

1. The problem statement, all variables and given/known data
for the elongation due to its own weight , i suspect the calculation of elonation due to its own weight is wrong .....

2. Relevant equations

3. The attempt at a solution
I think it should be (3456.3825)(75) / (300x10^-6)(200x10^3) = 4320m = 4320x10^3 mm , right ?

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• ###### IMG_20160917_131127.jpg
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2. Sep 17, 2016

### Bystander

Four kilometers?!

3. Sep 17, 2016

anything wrong with my calculation ?

4. Sep 17, 2016

### Bystander

Given that the original length is only 150 meters? What's your conclusion?

5. Sep 17, 2016

sorry , here's the second image

#### Attached Files:

• ###### IMG_20160917_131256.jpg
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6. Sep 17, 2016

### Bystander

You've made mistake(s) in the conversion to meters (handwritten work, 2nd image). Try it again.

7. Sep 17, 2016

### Staff: Mentor

I'm looking at the units of E in his calculation, and it doesn't seem correct to me.