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Problem Static

SOLVED
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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.

B.png

View solution in original post

15 REPLIES 15
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Re: Problem Static

Welcome to Mathcad.

 

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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Re: Problem Static

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.

B.png

View solution in original post

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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

 
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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

Capture.PNG

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. . .   Smiley Happy

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