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03-08-2019
12:16 PM

03-08-2019
12:16 PM

`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.`

Solved! Go to Solution.

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03-08-2019
02:20 PM

03-08-2019
02:20 PM

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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03-08-2019
12:37 PM

03-08-2019
12:37 PM

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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03-08-2019
12:45 PM

03-08-2019
12:45 PM

Re: Problem Static

ok

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03-08-2019
12:51 PM

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03-08-2019
02:20 PM

03-08-2019
02:20 PM

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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03-08-2019
03:35 PM

03-08-2019
03:35 PM

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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03-08-2019
03:37 PM

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03-08-2019
04:48 PM

03-08-2019
04:48 PM

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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03-08-2019
05:09 PM

03-08-2019
05:09 PM

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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03-08-2019
10:49 PM

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03-09-2019
12:01 AM

03-09-2019
12:01 AM

Re: Problem Static

`Thank you Fred that's what I needed, clear and perfect explanation.`

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03-09-2019
11:41 AM

03-09-2019
11:41 AM

Re: Problem Static

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

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03-09-2019
11:49 AM

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03-09-2019
01:41 PM

03-09-2019
01:41 PM

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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03-09-2019
03:26 PM

03-09-2019
03:26 PM

Re: Problem Static

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

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03-09-2019
03:42 PM

03-09-2019
03:42 PM

Re: Problem Static

I ALWAYS have to check. . .