Appying a force bar + Young's Modulus + Force Applied

AI Thread Summary
The discussion focuses on a homework problem involving the application of Young's Modulus to calculate the change in length of a force bar. The user has provided specific values for height, cross-sectional area, Young's Modulus, and applied force, and has attempted to calculate the change in length (ΔL) as 0.864 cm, resulting in a new length of 16.34 cm. However, there is confusion regarding the problem statement and the correct approach to the calculations. Other participants suggest that the user clarify the problem context and share all working steps for accurate feedback. The conversation emphasizes the importance of understanding Young's Modulus and the need for clear problem definitions in physics.
Jtwa
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1. Homework Statement
h = 17.2 cm
A = 12.32cm2
E = 410 MPA
Fapp = 6130 N
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2. Homework Equations
Stress
σ = F/A where F is force applied and A is cross sectional area of side where force is applied

Strain
ε = ΔL/L where L is the length of the bar and ΔL is the change of length of bar

Young's Modulus
E = stress/strain = FL/AΔL

3. My attempt at solution

We are solving first solving for ΔL which I got as 0.864cm and then we subtract that from 17.2cm which I got as 16.34cm

I'm not sure if my thought process is correct or how to approach this question. What is Young's modulus ? Am I approaching the problem correctly? Am I looking for the right variable? Did I get the correct answer ? Just need reassurance. Thanks in advance guys!
 
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Jtwa said:
1. Homework Statement
h = 17.2 cm
A = 12.32cm2
E = 410 MPA
Fapp = 6130 N
2. Homework Equations
Stress
σ = F/A where F is force applied and A is cross sectional area of side where force is applied

Strain
ε = ΔL/L where L is the length of the bar and ΔL is the change of length of bar

Young's Modulus
E = stress/strain = FL/AΔL

3. My attempt at solution

We are solving first solving for ΔL which I got as 0.864cm and then we subtract that from 17.2cm which I got as 16.34cm

I'm not sure if my thought process is correct or how to approach this question. What is Young's modulus ? Am I approaching the problem correctly? Am I looking for the right variable? Did I get the correct answer ? Just need reassurance. Thanks in advance guys!
You just have a bunch of numbers where a problem statement should be. What problem are you supposed to be solving? What is the text which should go with this data?

If you don't know what Young's modulus is, look it up! You've got the whole internet at your disposal.
 
oops. I forgot to upload a photo
 
Jtwa said:
oops. I forgot to upload a photo
I get a different number. Please post all your working.
 

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