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+--- Thread: (HP-67) Three-Dimensional Mars Lander (/thread-11563.html)
(HP-67) Three-Dimensional Mars Lander - Gamo - 10-10-2018 05:10 AM
Source: April 1979 BYTE Magazine
This is the upgrade version of the Moon Lander program.
I haven't finish reading this very interesting article yet but so excited to share
this wonderful program.
Here is the link to Google Photo:
https://photos.app.goo.gl/nbnxocZFnED2182B6
Enjoy !!
Gamo
RE: (HP-67) Three-Dimensional Mars Lander - Dieter - 10-10-2018 05:19 PM
(10-10-2018 05:10 AM)Gamo Wrote: This is the upgrade version of the Moon Lander program.
I haven't finish reading this very interesting article yet but so excited to share
this wonderful program.
Great. But why don't you share it in the HP65/67/97 Software Library, the home for all HP67 programs?
Dieter
RE: (HP-67) Three-Dimensional Mars Lander - Thomas Klemm - 10-10-2018 09:01 PM
Quote:If the limited fuel supply is exhausted, the space ship automatically free-falls to impact on the surface of Mars.
Well, that's not exactly how gravity works. It's possible to orbit Mars without fuel. At least for a certain amount of time. Which may be quite long.
Kind regards
Thomas
RE: (HP-67) Three-Dimensional Mars Lander - Albert Chan - 10-10-2018 10:31 PM
Quote:If the limited fuel supply is exhausted, the space ship automatically free-falls to impact on the surface of Mars.
The quote seems correct to me.
If the only force act on the space ship were gravity, it is by definition, free falling.
Free falling does not imply falling straight down (like the cartoons)
Orbiting is also free falling.
RE: (HP-67) Three-Dimensional Mars Lander - Gamo - 10-11-2018 01:27 AM
In the article mention that Mars gravity is much stronger than the moon gravity.
Anyone here try this program yet or any ported version for other HP programmable calculator to try this out.
Remark: Thanks Dieter, now I added this to the HP65/67/97 Software Library
Gamo
RE: (HP-67) Three-Dimensional Mars Lander - Thomas Klemm - 10-11-2018 09:26 AM
(10-10-2018 10:31 PM)Albert Chan Wrote: Orbiting is also free falling.
Quote:You're walking. And you don't always realize it
But you're always falling
With each step, you fall forward slightly
And then catch yourself from falling
Over and over, you're falling
And then catching yourself from falling
And this is how you can be walking and falling
At the same time
Walking and Falling
Laurie Anderson
It all depends but usually we don't say the Moon free-falls to impact on the surface of Earth.
Cheers
Thomas
PS: Imagine yourself in the international space station orbiting Earth.
What happens if you throw a bag of garbage in direction of Earth?
Does this surprise you?