# Thread: Yo Rayne, Math Shit

1. ## 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. How much ocean, all ocean or just as much ocean to cover the city?

3. 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.

4. My pain problem with this is I doubt .7 kilotons of explosives could hold the weight of the ocean.

5. the power it takes to LIFT the water above the city would be a lot more than it takes to hold it there

6. I don't understand how you can convert a unit of power into weight.

7. Originally Posted by Rayne
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.

8. Originally Posted by Kirby
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.

9. 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.

10. I've been awake for 25 hours. Maybe I'll try and figure it out later.

11. By 'it' I mean how much power is required to lift and hold up the water.

12. Also 'convert' is entirely the wrong word

13. 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. Hold on that math is completely off.

15. I'm too fucking sleepy. I'll think about it later.

16. The cities hieght is 800 meters.

17. Density of water = 1 gram per cubic centimeter = 0.000001 grams per cubic meter.
lol how did i get this. so stupid.

18. that is pretty funny actually

the problem is only you noticed it

19. 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. oh yeah the original question: your space ship thing has a laser of power output 10,000 gigawatts.

21. 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. 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. where the hell are you getting kilotons from

24. Pictures to amuse myself in showing you what I just showed:

this:

to this:

25. http://www.convertunits.com/from/kiloton+[explosive]/to/gigawatt+hour

it says kilowatts hour so IDK

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