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Science > Physics |
| User: |
"" |
| Date: |
10 Oct 2007 05:53:15 PM |
| Object: |
sending something into orbit |
Hello, my question is not about serious science, but it is a genuine
curiosity of mine.
Would a bullet shot from the hight of the highest weather balloon be
able to escape the Earth's atmosphere and enter orbit?
How could one, practically (short of building a rocket), put something
(anything) into orbit?
dan
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| User: "Androcles" |
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| Title: Re: sending something into orbit |
10 Oct 2007 06:04:41 PM |
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<danlior2@uiuc.edu> wrote in message
news:1192056795.032402.307300@19g2000hsx.googlegroups.com...
: Hello, my question is not about serious science, but it is a genuine
: curiosity of mine.
:
: Would a bullet shot from the hight of the highest weather balloon be
: able to escape the Earth's atmosphere and enter orbit?
Yes, given enough velocity. A bullet is a projectile just as a rocket is.
:
: How could one, practically (short of building a rocket), put something
: (anything) into orbit?
: dan
:
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| User: "dedanoe" |
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| Title: Re: sending something into orbit |
11 Oct 2007 06:54:44 AM |
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On Oct 11, 1:04 am, "Androcles" <Engin...@hogwarts.physics> wrote:
<danli...@uiuc.edu> wrote in message
news:1192056795.032402.307300@19g2000hsx.googlegroups.com...
: Hello, my question is not about serious science, but it is a genuine
: curiosity of mine.
:
: Would a bullet shot from the hight of the highest weather balloon be
: able to escape the Earth's atmosphere and enter orbit?
Yes, given enough velocity. A bullet is a projectile just as a rocket is.
:
: How could one, practically (short of building a rocket), put something
: (anything) into orbit?
: dan
:
velocity is wrong cause in general it has nothing to do with
displacement. simply x=Vt and no other way. if you put the object on D
distance from the center of the earth you simply need to give the
object F force normal to the distance but with same norm (|F|=|D| and
F normal to D). As the force becomes distance the distance becomes
anti force and thus the orbiting object never falls on the ground.
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| User: "Androcles" |
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| Title: Re: sending something into orbit |
11 Oct 2007 09:37:28 AM |
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"dedanoe" <dedanoe@gmail.com> wrote in message
news:1192103684.350648.279930@22g2000hsm.googlegroups.com...
: On Oct 11, 1:04 am, "Androcles" <Engin...@hogwarts.physics> wrote:
: > <danli...@uiuc.edu> wrote in message
: >
: > news:1192056795.032402.307300@19g2000hsx.googlegroups.com...
: > : Hello, my question is not about serious science, but it is a genuine
: > : curiosity of mine.
: > :
: > : Would a bullet shot from the hight of the highest weather balloon be
: > : able to escape the Earth's atmosphere and enter orbit?
: >
: > Yes, given enough velocity. A bullet is a projectile just as a rocket
is.
: >
: > :
: > : How could one, practically (short of building a rocket), put something
: > : (anything) into orbit?
: >
: > : dan
: > :
:
: velocity is wrong cause in general it has nothing to do with
: displacement.
You fire that bullet at 17,000 mph and its going into orbit, sunshine.
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| User: "Uncle Al" |
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| Title: Re: sending something into orbit |
11 Oct 2007 10:31:01 AM |
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wrote:
Hello, my question is not about serious science, but it is a genuine
curiosity of mine.
Would a bullet shot from the hight of the highest weather balloon be
able to escape the Earth's atmosphere and enter orbit?
How could one, practically (short of building a rocket), put something
(anything) into orbit?
Insertion of a lump of coal into low Earth orbit requires its enthalpy
of combustion. A 30-06 round will rise ~10,000 feet above ground
level. Low Earth orbit is at least 80 miles altitude. Typical
orbital velocity is 25,500 feet/sec. Where are ya gonna get a bullet
that fires at Mach 23?
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
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| User: "Sam Wormley" |
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| Title: Re: sending something into orbit |
10 Oct 2007 07:52:00 PM |
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wrote:
Hello, my question is not about serious science, but it is a genuine
curiosity of mine.
Would a bullet shot from the hight of the highest weather balloon be
able to escape the Earth's atmosphere and enter orbit?
How could one, practically (short of building a rocket), put something
(anything) into orbit?
dan
calculate orbital velocity with v = sqrt (mG/r), where m is the mass
of the earth, 5.9736 × 10^24 Kg, r is the distance from the center of
the to whatever shoots the bullet and G is 6.67300 × 10^-11 m^3 kg^-1 s^-2
So you can easily calculate the velocity required for the orbit... what's
the mussel velocity of the bullet in comparison?
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| User: "Igor" |
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| Title: Re: sending something into orbit |
11 Oct 2007 12:04:01 PM |
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On Oct 10, 6:53 pm, wrote:
Hello, my question is not about serious science, but it is a genuine
curiosity of mine.
Would a bullet shot from the hight of the highest weather balloon be
able to escape the Earth's atmosphere and enter orbit?
How could one, practically (short of building a rocket), put something
(anything) into orbit?
dan
If it was moving at escape velocity.
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| User: "Benj" |
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| Title: Re: sending something into orbit |
11 Oct 2007 01:56:41 PM |
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Igor wrote:
On Oct 10, 6:53 pm, wrote:
Hello, my question is not about serious science, but it is a genuine
curiosity of mine.
Would a bullet shot from the hight of the highest weather balloon be
able to escape the Earth's atmosphere and enter orbit?
How could one, practically (short of building a rocket), put something
(anything) into orbit?
dan
If it was moving at escape velocity.
Or find a way to apply a force to it the whole way that counters
gravity.
Yeah, we are ALL "curious" about this subject now that there has been
offered a 1 million dollar prize for the first person to get a camera
on the moon and then post photos on You Tube!
There can't be that many of us here to divide the spoils! Lets have a
go at it! My idea is that first of all what with miniature camera
chips one doesn't have to build anything close to a NASA-style lunar
lander. It ought to be MUCH easier to send some micro-circuit to the
moon than even a mars-style robot. Our lander could be a tiny flake.
As Igor notes, the first leg of the trip can easily be made with a
huge weather balloon. Remember the Mogul balloons that were used as
atomic monitors before there were satellites? Those things get pretty
high I think. If the camera were small and light enough I'm thinking
you might drive to and from the moon with just ionic wind!
Another question would be how to deal with getting the photos back on
You Tube. I see two ways. One is to just store them in a chip like a
digital camera and bring the camera back. But then you have to plan
TWO trips one to and one from the moon. The other is to transmit them
back but now you have to have a relatively heavy transmitter capable
of reaching earth from the moon. This makes your launch much heavier.
So come on guys! You all know we have LOTS of people here smarter than
Einstein. Just ASK them!! So pitch in your ideas. Who knows we might
make a few bucks for a sci.physics beer blast!!!! Someone needs to
keep the "sign-up list". Everyone welcome for a share of the project
just by signing up! Kooks welcome too! (One just never knows what kind
of idea will be THE ONE!)
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| User: "Uncle Al" |
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| Title: Re: sending something into orbit |
11 Oct 2007 07:55:48 PM |
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Benj wrote:
[snip]
Yeah, we are ALL "curious" about this subject now that there has been
offered a 1 million dollar prize for the first person to get a camera
on the moon and then post photos on You Tube!
There can't be that many of us here to divide the spoils! Lets have a
go at it!
[snip]
Hey git, stipulated: You are given an arbitrary propulsion system
that can (magically) boost from the Earth's surface to eventually
perform a lunar soft landing. Tell us how to get from here to there -
equations, timing, aim. YOU CANNOT DO IT.
Do us all a favor and shut up until you accumulate sufficient
knowledge to be only hopelessly ignorant.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
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