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Jan 19, 2016
03:51 PM

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Jan 19, 2016
03:51 PM

Help with solve block - errors

I already defined the solve block variables but mathcad is still giving me an error that shows that the variable/equations are undefined.

Can anyone help me find the error here so I can find variable P?

Thanks!

2 REPLIES 2

Jan 19, 2016
05:48 PM

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Jan 19, 2016
05:48 PM

You first need to fix a units problem. Mathcad insists P has units of force, in which case sigma(P) has units of pressure. It therefore cannot be equated to sigma[n, which has units of force.

Jan 20, 2016
09:27 AM

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Jan 20, 2016
09:27 AM

As Richard said, it's a units problem.

Your solution would be:

But when evaluated:

Success!

Luc