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BB_1410064610-Marble
10-Marble
Oct 23, 2025 7:54 PM UTC
Solved

These units are not compatible

I'm using MathCAD 9.0.0.0. I get this error on my last equation...

BB_14100646_0-1761248990975.png

I don't know what's off because all of these variables worked fine together up until this point. Initially the box was only around the first CDH until I added "explicit,ALL" so that might be something to look at.

 

Thanks,

      Brent

Werner_E
Werner_EAnswer
25-Diamond I
Oct 23, 2025 9:38 PM UTC
@BB_14100646 wrote:

I just realized I left out multiplication, so I added that, but am still getting an error.

No, you didn't!?

1) You should enable "Units/Constants in Symbolics" in the calculation options. In the first sheet you posted it was not enabled. That was the only difference between the two sheets I noticed.

2) looks like you forgot a factor in the second summand. CDH is just a scalar, all other summands are forces. Maybe the factor should be CD??

Werner_E_0-1761255386388.png

 

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3 replies

BB_1410064610-MarbleAuthor
10-Marble
Oct 23, 2025 8:01 PM UTC

I just realized I left out multiplication, so I added that, but am still getting an error.

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Werner_E
Werner_E25-Diamond IAnswer
25-Diamond I
Oct 23, 2025 9:38 PM UTC
@BB_14100646 wrote:

I just realized I left out multiplication, so I added that, but am still getting an error.

No, you didn't!?

1) You should enable "Units/Constants in Symbolics" in the calculation options. In the first sheet you posted it was not enabled. That was the only difference between the two sheets I noticed.

2) looks like you forgot a factor in the second summand. CDH is just a scalar, all other summands are forces. Maybe the factor should be CD??

Werner_E_0-1761255386388.png

 

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    BB_1410064610-MarbleAuthor
    10-Marble
    Oct 24, 2025 11:11 AM UTC

    Thank you so much!

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