Virgin in Outer Space

Discussion in 'The Okie Corral' started by automatic slim, Jul 28, 2018.

  1. automatic slim

    automatic slim Former "Walmart Shopper"

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  2. OldDad

    OldDad

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    You can become weightless at any altitude if you're falling. You still have mass, but not weight.
     

  3. maxmanta

    maxmanta

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    People on the ISS are still subject to about 80% of the gravity on the surface of the earth

    The ISS is constantly "falling" (ie accelerating) towards the Earth. The only frame of reference to the astronauts is the inside of the station (and they're accelerating along with it) , hence the "weightlessness."
     
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  4. inthefrey

    inthefrey Moved on...

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    50-60 miles up is considered "SPACE".
    You're not really out of the atmosphere till you reach that altitude.
     
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  5. automatic slim

    automatic slim Former "Walmart Shopper"

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    I have to wrap my head around this, but it's starting to make sense. They're so high up, and they're moving in a direction, but they have no ground to hit... Sorry for my ignorance, I just need to think about it.
     
  6. Just_plinking

    Just_plinking

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    Google Newtons cannonball.
     
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  7. Oldschooltube

    Oldschooltube Flux Capacitor Technician

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    They are “falling” but they are also in orbit around what they are falling toward. The centripetal force of orbit balances out the pull of gravity.

    Turn off the gravity and they would be flung into space. Vice versa with the centripetal force. Turn it off and they would become a brick that burns up in the atmosphere.
     
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  8. maxmanta

    maxmanta

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    Think of it as standing on a small planet with NO atmosphere--something like the moon, but perfectly smooth. An atmosphere would create drag, which we can't have here.

    Then you throw a ball parallel to the ground. The planet's gravity "pulls" the ball towards the ground in an arc, BUT you throw it just hard enough so that your ball's trajectory matches the curved surface of the planet. The ball just keeps going and going at the same altitude. That's being in orbit.

    The Earth's gravity is "pulling" on the astronauts inside the ISS, as well as on the station itself. Since their reference frame is the inside of the station, it gives a sense of weightlessness.
     
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  9. maxmanta

    maxmanta

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    Not to get too technical, but gravity IS the centripetal force that is pulling them towards the earth. Centripetal force is a force towards the center point of a circle.

    Centrifugal force is what you "feel" when you're traveling around the edge of a circle. The force is only felt (and measurable) by people in the accelerating reference frame.

    It's similar to being in an elevator that's accelerating upwards. You feel heavier because of the resulting force from being inside of an accelerating compartment.
     
  10. G33

    G33 Frisky! CLM Millennium Member

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    Having read GT for awhile, I thought this was about a crew member.
    And conversion.
    :)
     
  11. Fred Hansen

    Fred Hansen Liberal Bane

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    That every kid in America doesn't know who Elbert Leander "Burt" Rutan is, is a clear measure of how f-ed up America has become. MAGA
     
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  12. PlayerOne

    PlayerOne

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    That's essentially what geosynchronous orbit is -- falling to Earth, but constantly missing.
     
  13. maxmanta

    maxmanta

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    Again, not to get technical, but a geosynchronous orbit is at a specific point above the equator, at a specific height and at a velocity that matches the surface of the earth, so that you "stay" at a fixed pount relative to a point on the earth.
     
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  14. inthefrey

    inthefrey Moved on...

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    Centrifugal force l is basically inertia, denied and redirected... :D
     
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  15. inthefrey

    inthefrey Moved on...

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    About 23,200 miles, directly above the equator... The Clarke Belt. I use equipment that's parked out there daily... :D
     
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  16. spork

    spork Caffeinator

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    I don't know about the physics behind traveling to space and being in space, but I know that I want to go to space. However, the cost of traveling there may be prohibitive.
     
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  17. larry_minn

    larry_minn Silver Member Millennium Member

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    As a child I was told "trips to the Moon over the weekend will be common" by @ year 2000. Now it's 2018. We can't get astronauts in ISS without paying other countries to haul them....
    I remember "the space shuttle will be framework for next generation flying space craft that won't need tiles, larger payload, less boosters...." The shuttle was stopped and as quickly as possible trashed so nobody could consider restarting it.
    With absolutely NOTHING planned (that is being built that I have heard of) to replace. I highly doubt man (on NASA equipment) will walk on moon in my lifetime again. Much less family vacations
     
  18. Just_plinking

    Just_plinking

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    Voyager - first nonstop flight around the world without refueling. That guy, and his designs, are fascinating
     
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  19. Haldor

    Haldor Formerly retired EE.

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    Going to be pedantic. There is no such things as centripetal force.

    In the case of the ISS there is momentum and gravity.
     
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  20. Just_plinking

    Just_plinking

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    There is only a "normal" force induced by centripetal acceleration which, as you said, is a different thing.