Posts Tagged ‘explosive’

Transcript “The Saturn V in perspective”

December 14, 2014

Many thanks to Linda for supplying this transcript!

[0:00] “As You Remember It: The Lift-Off of APOLLO 11”: “T-minus 60 seconds and counting”

[0:02] Thunderf00t: You know, risk comes to us in many forms, and sometimes death doesn’t even bother to wear a mask. And sometimes, if you wanna achieve great things, you’ve just gotta accept that dance with death.

[0:19] This is the mighty Saturn V rocket. It weighed about 3,000 tons—almost all of which was fuel. And that fuel had about the same energy density as high explosives.

[0:32] clip: “20 seconds and counting”

[0:34] Thunderf00t: That is, this beast was a barely controlled, 3,000 ton BOMB. Let me just throw that into perspective for you.

[0:45] This, on the same scale, is the B-17 Flying Fortress. It was the mainstay heavy bomber of the United States in early WWII. And it could carry about three tons of bombs to a distant target. And about a 1,000 of these guys could lay waste to a city. A thousand bombers at say, three tons a piece—that’s 3,000 TONS of explosives. That’s about the same energetic content as the Saturn V rocket.

[1:15] clip: “T-minus 15 seconds. Guidance is internal”

[1:18] Thunderf00t: And man, [dramatic music] as frail as you or I, ascended ALL the way to the top of this rocket, which was essentially a 3,000 ton BOMB

[1:30] clip: “12, 11, 10,”

[1:32] Thunderf00t: -enough energy to lay waste to a city

[1:36] clip: “9, ignition sequence start”

[1:39] Thunderf00t: -and fully aware, at exactly what they were sitting on

[1:43] clip: “6, 5,”

[1:45] Thunderf00t: -they said, ‘Let’s light this candle’

clip: “4, 3, 2, 1, 0. All engine running. Liftoff! We have a liftoff! 32 minutes past the hour, liftoff on Apollo 11 . . . Tower clear! Tower clear!”

[2:03] Thunderf00t: And even with all those insane risks, I would’ve still changed places with them in a heartbeat, for the wonders that they saw.

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Why God stopping the Sun in the sky is so stupid, no matter which way you look at it!

October 6, 2012

Joshua call on God and God stops the sun in the sky right?

Well considering God was only doing this such that Joshua could have light to continue his butchery of a fleeing people (man woman and child), this has to be the most inefficient use of military force ever.  The Earth rotates once a day (ish, it actually depends on how you define days, when the Sun is in the same place again (solar time) , or the stars (siderial time)).  Just to give that some perspective, the people at the Earth surface on the equator are travelling about 1000 miles per hour (1.4x the speed of sound in the frame of reference of the Earths center of mass), those at temperate latitudes are doing about half of that, and those at the poles are doing zero!  This means if God merely stops the Earth, the people on the surface will be doing about half the speed of sound relative to the surface.  Given that it generally hurt to fall over, hitting objects at the best part of the speed of sound is probably going to sting!

Just so you know, this is what it looks like for something to hit a wall at about the speed of sound!

 

However to truely ‘Stop the Sun in the sky’ you need to stop the Earth in it’s orbit.  Here the calculations are actually very easy.  The Earths orbit around the Sun in about 30 km/ second.  Given the speed of sound is about 1/3rd km per second, this means the Earths orbital velocity is some 90 times the speed of sound.  So in order to stop the Sun in the sky you need to reduce the Earth velocity by 90 times the speed of sound, which in a frictionless environment is the same energy it would take to accelerate the Earth from rest to 90x the speed of sound.

So how much energy would this take?

Well kinetic energy is given by 1/2 x mass x velocity^2 (thats velocity squared)

So lets take a unit mass (1kg), and accelerate from rest to 30 000 meters per second (30 km/s the orbital velocity of the Earth around the Sun)

KE = 0.5 x 1 x 30 000^2 joules (1/2 mv^2)

KE = 225 000 000 joules = 225 000 kJ

So how much explosive would be needed to accelerate a unit mass to his velocity.

Well wiki tells us that a killogram of TNT exploding releases 3 000 000 J of energy per kg,  = 3 000 kJ

That means it will take about (225 000/3 000) kg of TNT to accelerate a kg to the orbital velocity of the Earth around the Sun.  Give or take, it requires about a 100 times an objects mass in TNT to accelerate it to this orbital velocity.  So to stop the Earth in its orbit would require about 100 times its mass in high explosives.

Lets just take a look at this in terms of total war.  Historically it turns out bombing is not a very efficient way of killing people, such that in WW2 it would typically take about 1 ton of bombs to kill one person.  Some ball park numbers,

In the bombing of Berlin, some 60 000 tons of explosive were dropped, which killed some 20-50 000 people.  These are actually fairly typical numbers for WW2.

So modern(ish) warfare takes about a TON of explosive to kill one person.  That might sound inefficiency till you compare to to God!.

God expends 100x the mass of the Earth in high explosive (~100 x 6 000 000 000 000 000 000 000 tons)

So lets say God killed 10 000 people by doing this, this means that God expended about the same energy as 6 000 000 000 000 000 000 tons of high explosive per person killed. The biggest atom bomb ever was the Czar bomb at some 50 megatons (50 000 000 tons of TNT).  This means that Gods expenditure of energy here was about the same as 100 000 000 000  (ONE HUNDRED BILLION Czar bombs per person he killed).

So, lets see, God, determined to wipe out a fleeing people, first tries throwing rocks at them, and manages to kill some of them, and then when Joshua wants some extra daylight to continue with this religious genocide, God obliges by stopping the Earth in its orbit at an energetic cost of 100x the Earth mass in high explosive, when the same effect could have been had with a truck load of flares.  Given that people can be killed simply by simply stopping the electrical current that regulates the heart, stopping the Earth such that Joshua can continue to kill man, woman and child by stabbing them with sharp pieces of metal seems to be both EXCEPTIONALLY inefficient and psychologically VERY messed up.

 

 

Why cold fusion is bullshit

November 21, 2011

So why is cold fusion bullshit?

    Firstly you need to understand the orders of magnitude of energy.  Imagine a kilogram of explosive.  Blow it up and you get a lot of energy.  In fact that energy actually comes in the form of accelerated atoms/ molecular fragments, and the pressure and temperature from these is what causes damage.  Okay, so when you blow up explosive you are releasing chemical bond type energy, and that’s typically in the eV (electron volt) range per nuclei.

     Now imagine a fusion type event.  This typically releases MeV (a million times as much energy) per nuclei.  This is why 10kg warhead, when releasing its energy all at once, can give kilotons of chemical explosive equivalent energy.  Bear in mind that for chemical explosive, you have eV type amounts of energy per nuclei (about the energy of a chemical bond), while with fusion you have a million times that.  So you fragments from fusion type events typically have a million time chemical bond energy, and this is why they are so dangerous.  That can make a mess of your DNA and kill your cells.  The bottom line is it really doesn’t matter if your fusion takes place at room temperature or millions of Kelvin, the products still have CRAZY amounts of energy.

    This is why if you really did have cold fusion on your desktop, you would be a gold plated idiot to be in the room while the reactor was running.  This is apparently what our Italian scientists are doing while running their ‘cold fusion reactor’.  However for some strange reason our Italians don’t find any high energy radiation.  This was also the problem with Pons and Fleischmanns claims of cold fusion.  They were claiming to get enough energy out to boil water.  Hmmm well if they had had that sort of fusion energy flux, everyone in the room would have died from the radiation.

Cold Fusion, normally turns out to be a poorly calibration thermocouple.

     This is where the whole thing goes into the category of bullshit.  Fusion is great ‘cos you generate MeV per reaction.  If you don’t have those high energy particles, then whatever you are doing is not fusion!  Even more perculiar is if you wanted to work out what sort of fusion you had going on, the first thing you would measure would be the energies and fluxes of the radiation coming off the sample.  Not only have our Italians not tried the obvious analysis (well how can they when they have no high energy radiation) but instead they focus on the bloody silly metric of ‘excess energy’.  That is they claim to put X energy in, get Y energy out and ascribe the difference to fusion, even though it’s bloody obviously from the lack of high energy particles that its not fusion.  The nearest analogy I can think of its like lighting a firework, watching it generate more energy than was put in, then concluding that the ‘excess energy’ must have been cold fusion.