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Regular Member

## Problem Static

`Good afternoon group friends, I am a beginner in Mathcad, and I am not able to finish a static problem, if you can help me, thank you very much.`

1 ACCEPTED SOLUTION

Accepted Solutions
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## Re: Problem Static

What did you expect? You have not defined x and y so you cannot expect a numeric result.

You may let Prime evaluate symbolically, though.

15 REPLIES 15
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## Re: Problem Static

Due to PTC's greed, since you are using Prime version 5, many of us cannot see your problem.  Consider posting a picture version as well.

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ok

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## Re: Problem Static

`Follow the file in jpg`
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## Re: Problem Static

What did you expect? You have not defined x and y so you cannot expect a numeric result.

You may let Prime evaluate symbolically, though.

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## Re: Problem Static

`Werner, why the final answer did not show in "m", what I'm missing here. If you had to solve this problem through vectors would you do the same thing I did?`
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## Re: Problem Static

That is due to your definition. You defined rp as rp:=[x y 0] m. This means that x and y, like 0 are just numbers, without units. I would be rp that contains x m, y m and 0 m.

If you're interested, you might try to find out what happens if you define rp as rp:=[x y 0] and then solve x and y.

Success!
Luc

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## Re: Problem Static

`Thanks LucMeekes, but I did not quite understand the answer, rp = [x y 0] m is different from rp = [xm ym 0m]. I used it the way it said and it did not work, could you please give a practical example.`
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## Re: Problem Static

Attached is Prime 4 file, readable with 5

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## Re: Problem Static

`Thank you Fred that's what I needed, clear and perfect explanation.`
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## Re: Problem Static

Sorry to nit-pick, but I think Fred has a sign error.

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## Re: Problem Static

Sorry, Prime 5 worksheet. PDF attached.

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## Re: Problem Static

Thanks for pointing out my error!  (See the attached sheet for a long, devious correction and reason.)

But your solution also has an error:  cross products are sensitive to order; both your solve block and your check have the order reversed

should be [-0.114   0.2   0]

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## Re: Problem Static

You're right, as usual, Fred. I need to go back to school!

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## Re: Problem Static

I ALWAYS have to check. . .

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