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10-17-2015
06:52 AM

10-17-2015
06:52 AM

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12-15-2015
08:56 AM

12-15-2015
08:56 AM

UK Mathcad Prime Minister is one user of our site about rockets calculation

See please more David Cameron watched Tim Peake's space launch and everyone's laughing at him - Mirror Online

65 REPLIES 65

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10-18-2015
10:40 AM

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10-18-2015
11:37 PM

10-18-2015
11:37 PM

Re: Two stage rocket

Hi Vallery. Nice example. I guess that what you can remark there is that the equation Force = mass x acceleration isn't true!. Newton equation is Force = dp/dt.

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10-19-2015
01:46 AM

10-19-2015
01:46 AM

Re: Two stage rocket

AlvaroDíaz wrote:

Thanks, Alvaro.

See please One Rocket (пуск ракеты с подводной лодки)

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10-19-2015
02:24 AM

10-19-2015
02:24 AM

Re: Two stage rocket

Hello Valery,

technically the Soyuz is a two-and-a-half (2 1/2) stages rocket as the four boosters start together with the core stage which continues running after the booster have separated. 🙂

Raiko

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10-19-2015
02:41 AM

10-19-2015
02:41 AM

Re: Two stage rocket

Tanks, Raiko, I Know it. See please - Союз (ракета-носитель) — Википедия

I would like to solve this task with Союз with my students - see Московский лицей 1502. Класс 10-10

Can you help us? With Alvaro and... Isaak!

It is very interesting optimization problem. What is an objective function?!

PS

g=g(h(t), altitude)

See please my Mathcad Web-sheet http://twt.mpei.ac.ru/MCS/Worksheets/g-h-psi.xmcd

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10-19-2015
05:40 AM

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10-19-2015
05:50 AM

10-19-2015
05:50 AM

Re: Two stage rocket

Thanks, Alvaro.

But better with **units** in Prime.

I would like to solve this task 24/10/2015 with my students - see Московский лицей 1502. Класс 10-10

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10-24-2015
03:30 AM

10-24-2015
03:30 AM

Re: Two stage rocket

g is a function - not constant:

Prime

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10-24-2015
06:37 AM

10-24-2015
06:37 AM

Re: Two stage rocket

Valery: your ode is mv'+mg=F, true if m constant. But m=m(t) and vary, so you lost the therm m'. The above mc11 ode, and the attached is the same. Newton's law is F=dp/dt.

Best Regards.

PD: Wau! What's an experience work in prime!. I'm need hollidays after this.