Posers and Puzzles

Posers and Puzzles

  1. Standard membersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
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    52874
    11 Apr '14 13:09
    So its 100 years from now, Fedex has a space division, rockets can go for hours at many g's and there is an emergency on the moon, they have to get this medicine to the moon in one hour or 50 people die from a horrible lunar virus.

    So if you can accelerate at some steady g force, then half way turn around and decel the rest of the way to be at the moon with zero velocity, soft landing, how many g's of constant acceleration to get that medicine to the moon in one hour does it take?
  2. Standard memberwolfgang59
    Mr. Wolf
    at home
    Joined
    09 Jun '07
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    46124
    12 Apr '14 01:24
    Originally posted by sonhouse
    So its 100 years from now, Fedex has a space division, rockets can go for hours at many g's and there is an emergency on the moon, they have to get this medicine to the moon in one hour or 50 people die from a horrible lunar virus.

    So if you can accelerate at some steady g force, then half way turn around and decel the rest of the way to be at the moon ...[text shortened]... how many g's of constant acceleration to get that medicine to the moon in one hour does it take?
    about 12g
    (that's using my left hand and the back of an envelope)

    basically you need to know the acceleration needed to get half way (200,000 km) in 30 mins

    my estimate is surprisingly low ... 😕
  3. Standard membersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
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    12 Apr '14 06:56
    Originally posted by wolfgang59
    about 12g
    (that's using my left hand and the back of an envelope)

    basically you need to know the acceleration needed to get half way (200,000 km) in 30 mins

    my estimate is surprisingly low ... 😕
    I got about 12.25, you were pretty close. I was wondering if we ever develop propulsion that powerful how much long term acceleration could a person take?

    Obviously 12 g's would kill you but could you take it for an hour? I don't think so.

    1 g would get you there in a few hours however, so that is possible.

    2g's? maybe.

    The formula is T= square root of (2S/A) T=time, S=distance, A=acceleration.
  4. Standard membertalzamir
    Art, not a Toil
    60.13N / 25.01E
    Joined
    19 Sep '11
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    12 Apr '14 18:15
    From livescience.com, "What Are the Limits of Human Survival":

    "According to a recent article in Popular Science, 14 Gs of lateral acceleration can tear your organs loose from one another."

    ...

    "...suggest we can slow down at a rate of 45 Gs, or the equivalent of the gravity of 45 Earths, and still live to talk about it."

    So who knows, maybe there will one day be pizza on the moon within 30 minutes of order so the pizza won't be cold or free.
  5. Standard membersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
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    12 Apr '14 18:382 edits
    Originally posted by talzamir
    From livescience.com, "What Are the Limits of Human Survival":

    "According to a recent article in Popular Science, 14 Gs of lateral acceleration can tear your organs loose from one another."

    ...

    "...suggest we can slow down at a rate of 45 Gs, or the equivalent of the gravity of 45 Earths, and still live to talk about it."

    So who knows, maybe ...[text shortened]... will one day be pizza on the moon within 30 minutes of order so the pizza won't be cold or free.
    Nah, they would just use a heated 3D printer already there....

    What does that mean, slow down at 45 g's? If 14 g's can tear you apart, why wouldn't 45 g's turn you into jelly?

    In our example, are they saying we might be able to survive 12 g's? For an hour?
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