# Stress and Strain Factor of Safety

## Homework Statement

Hello,

I've been given a question:

The ultimate strength of a round steel rod is 560MPa. If a factor of safety is 6 is required, what is the maximum permissible load for the rod if it has a diameter of 6.9cm?

If anyone can explain how to set up this calculation and how I go about solving this question it would be great.

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## Homework Statement

Hello,

I have been given the question:

What is the factor of safety of a steel hanger having an ultimate strength of 560MPa and supporting a load of 71000N. The steel hanger in question has a cross sectional area of 5 cm squared.

If anyone can help me set up the formula and explain how I go about solving this question that would be great.

Hello,

Thanks for the reply...I've tried calculating it and I'm pretty close but for some reason a few decimal places off.

I'm guessing I need to convert cm squared to metre squared? And MPa to Pa? I'm getting all confused.

rock.freak667
Homework Helper
Start with the definition of the factor of safety, how does it relate the maximum stress to the ultimate stress?