The Custom Component Template has a section to define ports and it has a section to preview the code. To place ports, (dummy) variables for signals must be defined in the equation list "eq" of the template.

Modelica code with port definitions can be copied after previewing the code.

The latest version of the template allows some customization. There is probably no need to disassemble already existing components.

Not the exact desired but shorter
 

Download Q20230110_m1_short.mw

For both expressions, when plotted separately, smartplot seems to determine the range with the criteria that values become complex. For me it looks like that assumptions are ignored.

Download smartplot.mw

The main difference in your results comes from the cross section you need to rotate. I have done this in the attached document. Note that the width b is defined in the y-direction and the height in the z-direction (see the help page).  Alternatively, you can also orient the direction of gravity in the z-direction. Below you can see the effect of the elastic coordinates, which "only" contribute to 25% less deflection than expected.  

EC1 is a valuable option if you are interested in fast calculations and resonnant frequencies. In the linear case (small deflections) these are only about half of the 25% higher than expected.

Konzola-_rotated.msim

inserts a new execution group before the cursor.

For pasted text you could try F3 to split the text at the postition of the cursor.

from the menu should also work.

Expand the document block (right click where the red cross is then show command) reveals that fsolve was used which stops at the first root encountered.

This can have many reasons. To start I would check this

https://faq.maplesoft.com/s/article/Scaling-issues-when-using-high-resolution-monitors-on-a-Windows-machine?language=en_US

Here is a screen shot from my 4k setting (32'' monitor, compatibility settings in the program properties are all default, 150% font scaling in Windows display settings, no special Maple settings).

Do you get the tiny fonts right after starting Maple?

(Display resolution changes during a Maple session could be a cause. E.g. change of monitor).

Hope this helps for a start. If not, you might want to post details of your hardware and operating system settings.

I have noticed an improvement with Windows updates (i.e. i have not seen what you are showing for a while).

For test purposes you could change the display resolution to 2k and check if the font proportions are better.

For the background:

https://www.mapleprimes.com/questions/37691-How-Do-I-Change-The-Background-Colour

Since this one is old and not related to 4K you might want to ask a separate question.

Because there is an infinite number of solutions. Try

solve({sin(x)/x = 0}, AllSolutions = true)

to get the general solution.

For the plot of g, try increasing the number of ploted points with the plot option numpoints.

Download Unit_convertion_of_results.mw

I have rewritten your worksheet with equations to see what is substituted in the RMS expression. As you can see, value is not effective and convert,unit_free throws the same error you are encountering. This does not look good either.

Attached is a simple example where piecewise integration of constant functions worked well with units. Test wise, instead of constant functions I tried to integrate squared cosine functions and took the square root of it. This is equivalent to your RMS calculation and worked well. So, it is really strange what you are encountering.

I hope my additional observations can give a clue what is going on.  Or you can use my file to start from scratch.

Download UnitProblem_with_eqs.mw

simple_piecewise_integration_with_units.mw

I missed dharr's answer. Anyway, here is a less specific way that checks for any other function.

Download check_for_other_than_elementary_functions_1D.mw

Mapleflow allows you to enter Maple commands.

Try the Maple command convert(expr, units, 'N/m^3') on the expression expr with kg/m²s²

For sind:

Try help(Degrees,sind) and open the help page in a worksheet (Crtl O). Then execute the commands to see if sind works.

For RPMs:

Why should the unit be meter per second?

Have you considered using the unwrap option of help(SignalProcessing[Phase])

for your application?

The last statement is the problem. Do not assign a value to wx (which is used in GainQ1). This changes the definition of GainQ1 and thus the output (if you execute the last line again)