28 Mar 2024, 21:52 [ UTC - 5; DST ]
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Post subject: Re: Rocket Comparisons ... Posted: 06 Feb 2020, 08:37 |
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Joined: 11/03/08 Posts: 14529 Post Likes: +22860 Location: Peachtree City GA / Stoke-On-Trent UK
Aircraft: A33
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the world is a carousel the ariane rocket gets a head start toward orbital velocity because it is launched from closer to the equator
but then they also have to deal with the logistics of moving the finished spacecraft by sea to the launch site
I can see the argument both ways. To me the logical thing for spacex would have been to set up their whole operation in brasil instead of texas
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Post subject: Re: Rocket Comparisons ... Posted: 06 Feb 2020, 08:40 |
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Joined: 08/24/13 Posts: 8409 Post Likes: +3662 Company: Aviation Tools / CCX Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: Huh? If you are launching into an equatorial orbit, it takes less energy the closer you launch to the equator.
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Post subject: Re: Rocket Comparisons ... Posted: 06 Feb 2020, 14:38 |
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Joined: 01/01/11 Posts: 964 Post Likes: +599 Company: Well, it's UA now Location: Houston, TX
Aircraft: B-787 & C55
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Good game to play with people and kids old enough to understand:
The two of you are sitting down somewhere that is stationary, home, restaurant, waiting for an appointment, what ever.
Ask them "How fast are you moving/going right now?"
Generally they will say "I'm sitting right here beside you, I'm not moving at all."
Now you go into action blowing their mind. "Really? That's what you think? How about this, the earth is rotating eastward at approx. 1000mph, so you are moving east at that speed. (you can get into the latitude and moving slower as you go N or S discussion later if they are really interested)
They will usually nod their head in agreement and think about it for a bit. Now ask them again "How fast are you moving/going now?"
Usually the answer is "You just told me I'm going 1000 mph."
You respond, "Yes, that is right but you are also moving at approx. 66-67,000 mph around the sun as well as the 1000 mph that the earth is rotating."
They nod again and think for a bit.
For the third time ask "How fast are you moving/going now?" By this time you get a GTH look and "I guess I don't know (noun or adjective of their choice), why don't you tell me."
"Well, in addition to the earths rotation of 1,000 mph and the earths orbit at 66-67,000 mph our solar system is moving around the galactic center at approx. 500,000 mph. The human body is so used to these movements that we don't even notice them and we think we are sitting still even when we are not."
Then you can get into a "Theory of Relativity" discussion.
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Post subject: Re: Rocket Comparisons ... Posted: 06 Feb 2020, 15:30 |
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Joined: 01/27/18 Posts: 1653 Post Likes: +1514 Location: South NorthEast West Virginia :)
Aircraft: Club Archer
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Username Protected wrote: Good game to play with people and kids old enough to understand:
The two of you are sitting down somewhere that is stationary, home, restaurant, waiting for an appointment, what ever.
Ask them "How fast are you moving/going right now?"
Generally they will say "I'm sitting right here beside you, I'm not moving at all."
Now you go into action blowing their mind. "Really? That's what you think? How about this, the earth is rotating eastward at approx. 1000mph, so you are moving east at that speed. (you can get into the latitude and moving slower as you go N or S discussion later if they are really interested)
They will usually nod their head in agreement and think about it for a bit. Now ask them again "How fast are you moving/going now?"
Usually the answer is "You just told me I'm going 1000 mph."
You respond, "Yes, that is right but you are also moving at approx. 66-67,000 mph around the sun as well as the 1000 mph that the earth is rotating."
They nod again and think for a bit.
For the third time ask "How fast are you moving/going now?" By this time you get a GTH look and "I guess I don't know (noun or adjective of their choice), why don't you tell me."
"Well, in addition to the earths rotation of 1,000 mph and the earths orbit at 66-67,000 mph our solar system is moving around the galactic center at approx. 500,000 mph. The human body is so used to these movements that we don't even notice them and we think we are sitting still even when we are not."
Then you can get into a "Theory of Relativity" discussion. Yeah, but the galaxy is also moving through space.
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Post subject: Re: Rocket Comparisons ... Posted: 06 Feb 2020, 15:41 |
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Joined: 11/03/08 Posts: 14529 Post Likes: +22860 Location: Peachtree City GA / Stoke-On-Trent UK
Aircraft: A33
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speed is only defined in terms of the frame of reference. I'm sitting at my kitchen table. I'll define my table as stationary and the galaxy is moving by at 500,000mph
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Post subject: Re: Rocket Comparisons ... Posted: 06 Feb 2020, 16:23 |
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Joined: 01/31/12 Posts: 3094 Post Likes: +5447 Company: French major Location: France
Aircraft: Ejet
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Username Protected wrote: Yeah, but the galaxy is also moving through space. That is not so sure. There is consideration to be given about the expansion of the universe. In a weird way it is also true that we are not moving, it's the space between objects which increases due to that expansion. Regardless of the motion of those objects. A major issue is determining this factor, which is often assimilated into a constant in a few equations. edit: unless it's not empty space, and it's made of something that we are not equipped to detect yet. And that something drives bits apart. The next years in astronomy and physics are going to be super fun!
_________________ Singham!
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Post subject: Re: Rocket Comparisons ... Posted: 06 Feb 2020, 17:12 |
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Joined: 01/31/12 Posts: 3094 Post Likes: +5447 Company: French major Location: France
Aircraft: Ejet
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Username Protected wrote: Man, here I was just trying to decide whether to be, or not to be..... You raise a fascinating point, though. But to me, the answer to that was given by Descartes: cogito, ergo sum. "Discourse on the Method of Rightly Conducting One's Reason and of Seeking Truth in the Sciences" (sounds much better in French) is a fabulous read.
_________________ Singham!
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Post subject: Re: Rocket Comparisons ... Posted: 06 Feb 2020, 17:43 |
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Joined: 01/01/11 Posts: 964 Post Likes: +599 Company: Well, it's UA now Location: Houston, TX
Aircraft: B-787 & C55
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Username Protected wrote: speed is only defined in terms of the frame of reference. I'm sitting at my kitchen table. I'll define my table as stationary and the galaxy is moving by at 500,000mph Some guys named Ptolemy, Copernicus, Galileo, and possibly the Catholic Church would like to speak with you.
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Post subject: Re: Rocket Comparisons ... Posted: 07 Feb 2020, 01:04 |
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Joined: 06/17/14 Posts: 4894 Post Likes: +1862 Location: KJYO
Aircraft: C-182, GA-7
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Username Protected wrote: Man, here I was just trying to decide whether to be, or not to be..... I thought that is the question...
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