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24-Ruby IV
ValeryOchkov24-Ruby IV
24-Ruby IV
August 30, 2012
Solved

Odesolve and if (a task about skydiver)

  • August 30, 2012
  • 3 replies
  • 6862 views

See please the picture and the file (Mathcad Prime 2) in attach.

What I need!?

1) Your comments and suggestions.

2) More real input data

3) And, of course, that you praise me

fall-eng-1.png

fall-eng-2.png

fall-eng-3.png

Best answer by AlanStevens

Valery Ochkov wrote:

Thanks Alan!

I think a good variant is

fall-engC-1.png

Yes, this is much easier to read.

Alan

3 replies

A
AlanStevens19-Tanzanite
19-Tanzanite
August 30, 2012

Valery Ochkov wrote:

See please the picture and the file (Mathcad Prime 2) in attach.

What I need!?

1) Your comments and suggestions.

2) More real input data

3) And, of course, that you praise me

1. I suggest it's difficult to read and understand the ode in the form you've used. I think it's easier in the form I've used in the attached. Also, if you are interested in velocity as well as displacement then the state space form is better (more accurate velocity - see velocity graph).

2. I don't have any real data.

3. You are brilliant!

Alan

V
24-Ruby IV
ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
August 30, 2012

Thanks Alan!

I think a good variant is

fall-engC-1.png

fall-engC-2.png

A
AlanStevens19-TanzaniteAnswer
19-Tanzanite
August 30, 2012

Valery Ochkov wrote:

Thanks Alan!

I think a good variant is

fall-engC-1.png

Yes, this is much easier to read.

Alan

V
24-Ruby IV
ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
September 1, 2012

Oppppps!

The air density is a function of y - see http://en.wikipedia.org/wiki/Density_of_air

Now I am without Mathcad (with iPad). Alan, help me, please!

And second.

It will be good to have not 2 odes but 3 equations:

- a(t)=v'(t)

- v(t)=y'(t)

- -a(t)*m=...+...

A
AlanStevens19-Tanzanite
19-Tanzanite
September 2, 2012

Valery Ochkov wrote:

Oppppps!

The air density is a function of y - see http://en.wikipedia.org/wiki/Density_of_air

Now I am without Mathcad (with iPad). Alan, help me, please!

And second.

It will be good to have not 2 odes but 3 equations:

- a(t)=v'(t)

- v(t)=y'(t)

- -a(t)*m=...+...

Sorry Valery, I've been away for a couple of days! Do you mean something like the attached?

Alan

V
24-Ruby IV
ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
September 3, 2012

Thanks Alan!

1) mass=constant

See the attach

2) g=g(y)

V
24-Ruby IV
ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
October 15, 2012

Hi Alan!

Can we create in Mathcad a model of this fly:

http://www.bbc.co.uk/news/science-environment-19943590

V
24-Ruby IV
ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
October 15, 2012

My first try to create the model of the fly the skydiver from 39 km:

Sky-Diver-39km.png

V
24-Ruby IV
ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
November 11, 2012

New ODE problem:

http://www.youtube.com/watch?v=nRkQE0I4NZw&feature=plcp

(5 friends from Harvard University decided to send a delicious hamburger to space. B.good, a local hamburger company in Massachusetts, was generous enough to help us out and sponsor this entire mission (check them out at www.bgood.com). That was their burger! They are awesome.)

hamburger.png

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