# Stress in a beam

1. ### thephysicsman

89
1. The problem statement, all variables and given/known data

a) This steel beam has a quadratic cross-section (A=100mm2). The force F is 10 kN. Calculate the stress in the rod and show that this stress does not exceed the yield strength of the steel.

2. The attempt at a solution

a)

$$\sigma = \frac{10000N}{0.0001m^2}=100 MPa$$

I guess this is right? I'm not sure what the yield strength is. Can I calculate it from the given formulas?

3,215
The result is okay, but note that [MPa] = [N/mm^2], and not [N/m^2], i.e. you didn't need to convert A into [m^2]. I'm not sure what the expressions in the image mean - are you given a yield strength for steel?

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