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7-Bedrock

## 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
24-Ruby V
(To:malmeida2019)

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
23-Emerald I
(To:malmeida2019)

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.

7-Bedrock
(To:Fred_Kohlhepp)

ok

7-Bedrock
(To:malmeida2019)
`Follow the file in jpg`
24-Ruby V
(To:malmeida2019)

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.

7-Bedrock
(To:Werner_E)
`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?`
7-Bedrock
(To:malmeida2019)

23-Emerald III
(To:malmeida2019)

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

7-Bedrock
(To:LucMeekes)
`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.`
23-Emerald I
(To:malmeida2019)

Attached is Prime 4 file, readable with 5

7-Bedrock
(To:Fred_Kohlhepp)
`Thank you Fred that's what I needed, clear and perfect explanation.`
15-Moonstone
(To:malmeida2019)

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

15-Moonstone
(To:rgunwaldsen)

Sorry, Prime 5 worksheet. PDF attached.

23-Emerald I
(To:rgunwaldsen)

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]

15-Moonstone
(To:Fred_Kohlhepp)

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

23-Emerald I
(To:rgunwaldsen)

I ALWAYS have to check. . .

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