Flight of the rocket "union".

[еаристов]

Hello everybody. I encountered a problem when trying to plot the dependence of the flight speed of the "union" rocket on time. The program may not be perfect, but so far the main problem that I see is the scalar "h" that appears when using the function. I hope for your help in this matter. Thank you !

[KenFarley]

You would likely get people to answer your question if you posted it in the Mathcad forums. This is the Creo modeling forum.

[Tmetcalf]

Moving the discussion to Mathcad.

Best,

Toby

[ValeryOchkov]

В Mathcad 15 иной синтаксис оператора If - use if and otherwise!

[-MFra-]

Hi Егор Аристов,

Compliments! You invented a new logic, who knows how it works, the "else" is very beautiful, unfortunately it does not exist in mathcad.

However, it would be better to describe the equation differently.

[Werner_E · Accepted solution]

You sure must study the manual, help files, quicksheets, etc. more thoroughly (have you ever done?)

The errors you make a quite endless!

.) you mix up t and T

.) you invent new programming commands like else and end

.) its absolutely unclear what you intend with your two program blocks which you combine with an boolean =. I made a guess

.) you mostly have no units assigned, but you use the built in constang g, which of course is not just a number but has dimension acceleration and has the appropriate units. You can't mix up unit and unitless values

.) same unit problem at your initial conditions - suddenly you use seconds and kph - this can't work. Stay unitless when using odesolve in MC15

.) The syntax for odesolve is absolutely wrong - probably you have seen a sheet written in Prime. You have to stay with the Mathcad 15 instruction and help sheets as the syntax has changed a bit in Prime

Here is a working sheet - not sure if the function was meant that way

But of course you don't need odesolve for your problem. You can derive your functions by simple integrations: