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Thread: Yo Rayne, Math Shit

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  1. #1
    princeso Kirby's Avatar
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    Default Yo Rayne, Math Shit

    I know I already posted this on cosmo, but maybe with it's own separate thread it would gain validity.

    I am trying to calculate much explosive energy an Asgaurd lazer has. Without boring you with the scifi specifics to much, basically I first tried to find it out using the power output of the space ships power source, which is 1.21 gigawatts. Using a calculator found here http://www.translatorscafe.com/cafe/...on-%5Bkton%5D/, I did gigawatts to kilotons, getting a mere 1.041108987 kilotons, which is pretty pathetic for the strongest weapon in stargate, so I assume the output is wrong.

    So I tried something else. Another fact is the power source can hold the weight of the ocean over the city about the size of Manhattan. For this I first took the weight of water per meter 1000 kilograms, multiplied it by average depth of the ocean: 3,790 meters, then by area of Manhattan 87500 meters. Finally I multiplied that by the gravitational constant of 9.8, which should get the force in joules. So you get 3249925000000 joules, which using the same converter is again a low 0.776750717 Kilotons.

    Something is off here, and it is really bothering me, help me out.

  2. #2
    is good for you
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    How much ocean, all ocean or just as much ocean to cover the city?

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    princeso Kirby's Avatar
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    The depth of the ocean which for simplicity purposes I am saying 3,790 meters, over an area the size of manhattan: 87500 meters.

    This is all per second too, so don't worry about time.

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    princeso Kirby's Avatar
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    My pain problem with this is I doubt .7 kilotons of explosives could hold the weight of the ocean.

  5. #5
    what about .. eyebrows God's Avatar
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    the power it takes to LIFT the water above the city would be a lot more than it takes to hold it there
    "I'll go," said Chagataev. "But what will I do there? Build socialism?"
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    Registered Users Regular Rayne's Avatar
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    I don't understand how you can convert a unit of power into weight.

  7. #7
    princeso Kirby's Avatar
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    Quote Originally Posted by Rayne View Post
    I don't understand how you can convert a unit of power into weight.
    Force from can be transphered to energy, which then can be transphered to explosive power. 9.8 is the constant I believe you need to make this conversion from some quick internet research, so I might be wrong.

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    Registered Users Regular Rayne's Avatar
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    Quote Originally Posted by Kirby View Post
    Force from can be transphered to energy, which then can be transphered to explosive power. 9.8 is the constant I believe you need to make this conversion from some quick internet research, so I might be wrong.
    You're definitely wrong. 9.8 is the acceleration due to gravity of the earth. It can probably convert a mass to the amount of force necessary to move that mass against the effect of gravity but you'd need a lot more data to figure out the energy/power.

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    princeso Kirby's Avatar
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    I guess I will just have accept that Stargate lazers are incredibly weak, yet still the strongest in the universe. Fat man was 22 kilotons for christs sake.

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    Registered Users Regular Rayne's Avatar
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    I've been awake for 25 hours. Maybe I'll try and figure it out later.

  11. #11
    Registered Users Regular Rayne's Avatar
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    By 'it' I mean how much power is required to lift and hold up the water.

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    Registered Users Regular Rayne's Avatar
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    Also 'convert' is entirely the wrong word

  13. #13
    Registered Users Regular Rayne's Avatar
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    Average ocean depth = 4.3 km.
    Area of manhattan = 87 sq.km
    Volume of the water above the city = 374 cubic km. = 374 x 10^9 cubic meters.
    Density of water = 1 gram per cubic centimeter = 0.000001 grams per cubic meter.
    Weight of the ocean water = 374000 g
    Force required to lift up the mass (let's assume acceleration is equal to 10 m/s^2 since it needs to be greater than the acceleration due to gravity, which is 9.8, to counteract it) = 3740000 N
    Work that needs to be done to lift it to a height of, say, 1 km = 3740000000 joules

  14. #14
    Registered Users Regular Rayne's Avatar
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    Hold on that math is completely off.

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    Registered Users Regular Rayne's Avatar
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    I'm too fucking sleepy. I'll think about it later.

  16. #16
    princeso Kirby's Avatar
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    The cities hieght is 800 meters.

  17. #17
    Registered Users Regular Rayne's Avatar
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    Density of water = 1 gram per cubic centimeter = 0.000001 grams per cubic meter.
    lol how did i get this. so stupid.

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    princeso Kirby's Avatar
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    that is pretty funny actually

    the problem is only you noticed it

  19. #19
    Registered Users Regular Rayne's Avatar
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    anyway, weight of the water = 374 x 10^12 kg
    downward force due to gravity = 374 x 10^13 N
    you'll need a greater force to counteract it. lets assume it to be around 400 x 10^13 N
    the net force on the water = 26 x 10^13 N
    the acceleration produced due to that force = 0.8 m/s^2
    to scale a distance of 800 m, it would take (2x800)/0.8 = 2000 seconds
    the work done to move the water to 800 m = 20800 x 10^13 J = 2.08 x 10^17 J
    so the required power is approximately 1 x 10^14 watts = 10,000 gigawatts

    so essentially you need around 10,000 gigawatts of power to lift up an ocean to a height of 800 m above manhattan in approximately half an hour. to hold it up there you'll need a negligibly smaller amount of energy every second.

  20. #20
    Registered Users Regular Rayne's Avatar
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    oh yeah the original question: your space ship thing has a laser of power output 10,000 gigawatts.

  21. #21
    Registered Users Regular Rayne's Avatar
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    but i dont know how fast it can get the water up there oh wait i dont even fucking care why am i doing this

  22. #22
    princeso Kirby's Avatar
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    8604 Kilotons that is more like it

    Thats like 4 modern nukes, I can live with that. Still 6 times weaker than the largest russian bomb(50000 kilotons, but whatever.

    So about 25000 kilotons to take down a wraith hive ship.

  23. #23
    Registered Users Regular Rayne's Avatar
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    where the hell are you getting kilotons from

  24. #24
    princeso Kirby's Avatar
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    Pictures to amuse myself in showing you what I just showed:

    this:


    to this:


  25. #25
    princeso Kirby's Avatar
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    http://www.convertunits.com/from/kiloton+[explosive]/to/gigawatt+hour

    it says kilowatts hour so IDK

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