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BB_1410064610-Marble
10-Marble
October 23, 2025
Solved

These units are not compatible

  • October 23, 2025
  • 1 reply
  • 355 views

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

Best answer by Werner_E
@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

 

1 reply

B
BB_1410064610-MarbleAuthor
10-Marble
October 23, 2025

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

W
Werner_E25-Diamond IAnswer
25-Diamond I
October 23, 2025
@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

 

    B
    BB_1410064610-MarbleAuthor
    10-Marble
    October 24, 2025

    Thank you so much!

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