Calculating Force Using Young's Modulus

[chriscarson]

Homework Statement

Calculating Force when having the area .

Relevant Equations

How can you Calculate Force ?

How can you Calculate Force ?

 

[etotheipi]

I'm not sure what the question is specifically. We have $\sigma = \frac{F}{A}$ and $\varepsilon = \frac{\Delta L}{L}$, along with the definition of Young's modulus, $E = \frac{\sigma}{\varepsilon}$.

You can put these into one expression, namely $E = \frac{FL}{A\Delta L}$.

 

[chriscarson]

I'm note sure what the question is specifically. We have $\sigma = \frac{F}{A}$ and $\varepsilon = \frac{\Delta L}{L}$, along with the definition of Young's modulus, $E = \frac{\sigma}{\varepsilon}$.

You can put these into one expression, namely $E = \frac{FL}{A\Delta L}$.

the question is to find the force

 

[etotheipi]

the question is to find the force

So are you after $F = \frac{AE\Delta L}{L}$?

 

[chriscarson]

So are you after $F = \frac{AE\Delta L}{L}$?

well i have all those values so i can give it a shot , although our teacher give us homework that we didi nt had lesson on ,
thanks

 

[chriscarson]

was very close the teacher s answer was 981N mine was 9812.5N

 

[PeroK]

was very close the teacher s answer was 981N mine was 9812.5N

That's what's called being out by a factor of ten. Can you find the reason for it?

 

[chriscarson]

That's what's called being out by a factor of ten. Can you find the reason for it?

i know you can round it to 3 significant figures but nothing about factor of ten.

 

[PeroK]

i know you can round it to 3 significant figures but nothing about factor of ten.

You should post your calculation along with a statement of the problem. My guess is you've misplaced a decimal point somewhere.

 

[chriscarson]

You should post your calculation along with a statement of the problem. My guess is you've misplaced a decimal point somewhere.

ok it seems it s important to write the problem