# Is the minimum cross sectional area of the wire right? [closed]

The breaking stress of the wire is $$3.5\times 10^6 \,N/m^2$$. It is observed that the minimum cross-sectional area of the wire so that it does not break is $$18.67 \,cm^2$$. Now I need to find out if the observation is right or not.

At first, I have calculated the acceleration of the blocks. It is $$3.267\, m/s^2$$. I don't whether it is useful or not in this regard.

We now that, $$\displaystyle\text{Stress}= \frac{F}{\text{Area}}\,\text{or}\,\text{Area}=\frac{F}{\text{Stress}}$$. I think I can get the area with this equation. Am I right?

How can I calculate $$F$$ here? Is it $$5g+ 10g$$? Or what? Please help me. Thanks.

Calculate tension ($$F$$) in the string. So $$A_{min}=\frac{F}{\text{(Stress)}_{max}}.$$