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working stress

operator
in Classical Physics

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I need help with a question. A material to be used for a piston rod has an ultimate strength of 414 000 kPa. The maximum load on the piston is to be 70 000 N and the safety factor for the rod is 12. Calculate the working stress of the piston rod and the diameter of the piston rod? How do i begin. I know that Stress = load divided by area, but how do I find the area when i don't know the size of the material? What am i missing? That's all the information I have. Thx

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