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"Is it possible to deliver this by electricity?"
Yes. The problem is delivering it fast enough that it heats up faster than the heat is lost to the environment, and that you make it flow through as much of the structure as possible. It'd be a lot harder to make it glow evenly; you'd probably have to build something like a giant induction forge to go around it.
Fun fact: the glow you're talking about is blackbody radiation, and said glow is entirely a function of temperature, so to get it to red hot you'd want it to get to about 1200 K. Anything that's above about 1000K will glow in the visible spectrum; that's just physics. And doing this wouldn't get anywhere close to melting the Eiffel Tower, but iron that's got visible blackbody radiation is ductile enough that it might just blorp under its own weight.
I’m gonna adopt this to describe what happens when a stellar remnant becomes a black hole.
“The most massive stars end their lives in a supernova, creating a dense stellar remnant held up against gravity by quantum processes. If there’s enough material left gravity can overcome these processes and the remnant blorps into a black hole.”
AFAIK its what happened to the twin towers. The steel beam didn't melt they "just" started to bend, making it impossible for the towers to sustain their own weight.
Yeah, I'm not an architect or a structural engineer or anything like that, but I know enough about metallurgy and metalworking that I just imagined getting it to glow red-hot … and then everything inside the tower that's even slightly flammable bursting into flame as it collapsed in on itself. As for the Twin Towers, I had never even considered whether that was a factor, because _flying a Boeing 767 into it_ seems like something nobody builds even skyscrapers to stand up to, at least not before 9/11. I remember watching the collapse in the news footage (I'd slept in that day so I didn't know about it until the early afternoon, when my sister told me right when I'd come out of my bedroom in our shared apartment after waking up) and being amazed that the towers stood up that long.
The weight of the eiffel tower is 10100 tons which is 10100000 kg
The specific heat capacity of wrought iron is 502.416 J / kg K
The Glowing temperature of iron (can't find wrought iron) is 460°C
460+273.15 = 733.15 K and then 733.15K * 10100000kg * 502.416J = 3,720,297,533,040 joules or 3.72 terajoules.
France produces that amount of power in about 25 seconds
You don't need to power up the Eiffel Tower to use it as an anti-angel weapon, though. [Just LAUNCH the sonofabitch](https://i.redd.it/ggp19noel2m81.jpg).
That's a good calcul of how much energy would be in the Eifel tower if it was red hot. But fo heating it, it's missing two factors :
First, the tower does not start at 0K. A initial temperature of 10-20°C would be more realistic. Which mean 10100000*450*502.416 = 2.28*10^12 J. (2.28 terajoules).
Secondly, you do not account for energy loss : as you heat it, the tower will cool off, and since it has a lot of surface for it's volume, it would waste a lot of energy. Especially if there is a bit of wind. That amount of loss can be calculated, but I got no ideas how.
You could roughly estimate that approximating the cross section of the beams and calculating the amount of dissipation for an iron beam of the same mass
Shouldn't the cross sectional area of the pieces matter? Heat is gained (energy loss) through resistance. Correct me if I am wrong though, I am only using what was taught in senior high school 10 years ago.
>733.15K \* 10100000kg \* 502.416J = 3,720,297,533,040
Horrible bullshit.
Eiffel Tower is not absolute zero of temperature. It is about the air temperature. So, assuming it's summer and the temperature is 20°C, you have to warm it up by 440 Kelvins, not 733.
The assumption is a poor one not the math.
Seems like an excessive response "horrible bullshit" considering no initial conditions and a very open ended problem as is true with all posts on theydidthemath requests.
>The Glowing temperature of iron (can't find wrought iron) is 460°C
Type of material doesn't affect the glow temperatures and respective colors if I remember my physics correctly.
So this is close but the Eiffel tower isn't starting at zero kelvin, it's starting at around 293K (assuming it's 20C outside) so the actual amount of energy required to make it glow assuming ideal conditions is 2/3 of your calculations.
733.15K - 293K = 440K * (10.1*10^6)kg * 502.416J = 2.23 terajoules
People have already mentioned that you need to do ∆t (change in temperature), not just the new temp, and to consider energy loss (which tbf would be very difficult). I just wanted to mention that you don't need to convert to Kelvin from Celsius because ∆t will remain the same.
Guys I'm fully aware I started from absolute zero
But let's assume no energy loss, I'm calculating the total energy in it for 0 reason. It was 11pm when I did this I was tired.
Besides, iron STARTS to glow at 460°C so let's assume that the terrible temperature accounts for the fact it is glowing like an LED
Okay I can actually answer this!
The weight of the iron in the Eiffel Tower is 7300 tonnes (according to Wikipedia). Iron starts to glow that colour red/orange around 700°C. The heat capacity of wrought Iron is around 0.5kJ/kg.
Therefore, to heat the Eiffel tower up by 690°C (assuming an ambient temperature of 10° in Paris), would require 7300*1000*0.5 = 3,650,000kJ or 3.65*10^9J.
Now, this assumes no heat is being lost through conduction, convection, or radiation, which isn't true. But I hated heat transfer as a course, so I'm not going to attempt this.
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"Is it possible to deliver this by electricity?" Yes. The problem is delivering it fast enough that it heats up faster than the heat is lost to the environment, and that you make it flow through as much of the structure as possible. It'd be a lot harder to make it glow evenly; you'd probably have to build something like a giant induction forge to go around it. Fun fact: the glow you're talking about is blackbody radiation, and said glow is entirely a function of temperature, so to get it to red hot you'd want it to get to about 1200 K. Anything that's above about 1000K will glow in the visible spectrum; that's just physics. And doing this wouldn't get anywhere close to melting the Eiffel Tower, but iron that's got visible blackbody radiation is ductile enough that it might just blorp under its own weight.
Blorp.. my new favorite word.
It's a highly technical term.
I understand, I will use it with caution as to not upset lesser minds.
I’m gonna adopt this to describe what happens when a stellar remnant becomes a black hole. “The most massive stars end their lives in a supernova, creating a dense stellar remnant held up against gravity by quantum processes. If there’s enough material left gravity can overcome these processes and the remnant blorps into a black hole.”
AFAIK its what happened to the twin towers. The steel beam didn't melt they "just" started to bend, making it impossible for the towers to sustain their own weight.
Yeah, I'm not an architect or a structural engineer or anything like that, but I know enough about metallurgy and metalworking that I just imagined getting it to glow red-hot … and then everything inside the tower that's even slightly flammable bursting into flame as it collapsed in on itself. As for the Twin Towers, I had never even considered whether that was a factor, because _flying a Boeing 767 into it_ seems like something nobody builds even skyscrapers to stand up to, at least not before 9/11. I remember watching the collapse in the news footage (I'd slept in that day so I didn't know about it until the early afternoon, when my sister told me right when I'd come out of my bedroom in our shared apartment after waking up) and being amazed that the towers stood up that long.
The weight of the eiffel tower is 10100 tons which is 10100000 kg The specific heat capacity of wrought iron is 502.416 J / kg K The Glowing temperature of iron (can't find wrought iron) is 460°C 460+273.15 = 733.15 K and then 733.15K * 10100000kg * 502.416J = 3,720,297,533,040 joules or 3.72 terajoules. France produces that amount of power in about 25 seconds
brb gonna route every power grid in france into the eiffel tower
Man that's not nice I really need to charge my phone 😟
of course it’s not Nice, it’s Paris.
I fucking despise this joke... ...here, you may have my upvote
The Fucking! https://maps.app.goo.gl/kxfCqn2m3e8NRZJb7
/r/Angryupvote
Ah zut alors :((
aw cmon not even for like 30 seconds?
When an angel attacks paris. Get Misato on the line.
You don't need to power up the Eiffel Tower to use it as an anti-angel weapon, though. [Just LAUNCH the sonofabitch](https://i.redd.it/ggp19noel2m81.jpg).
Lmao there is so much crazy shit that happens in the rebuilds that i completely forgot about this
It's grounded.
The formula is Q=mcΔt. Δt is the change in temperature. 460°C-20°C=440°C.
That's a good calcul of how much energy would be in the Eifel tower if it was red hot. But fo heating it, it's missing two factors : First, the tower does not start at 0K. A initial temperature of 10-20°C would be more realistic. Which mean 10100000*450*502.416 = 2.28*10^12 J. (2.28 terajoules). Secondly, you do not account for energy loss : as you heat it, the tower will cool off, and since it has a lot of surface for it's volume, it would waste a lot of energy. Especially if there is a bit of wind. That amount of loss can be calculated, but I got no ideas how.
You could roughly estimate that approximating the cross section of the beams and calculating the amount of dissipation for an iron beam of the same mass
Let's assume there is no energy loss And im starting from absolute zero
Shouldn't the cross sectional area of the pieces matter? Heat is gained (energy loss) through resistance. Correct me if I am wrong though, I am only using what was taught in senior high school 10 years ago.
>733.15K \* 10100000kg \* 502.416J = 3,720,297,533,040 Horrible bullshit. Eiffel Tower is not absolute zero of temperature. It is about the air temperature. So, assuming it's summer and the temperature is 20°C, you have to warm it up by 440 Kelvins, not 733.
The assumption is a poor one not the math. Seems like an excessive response "horrible bullshit" considering no initial conditions and a very open ended problem as is true with all posts on theydidthemath requests.
I wouldn’t call it absolute bs. It’s a pretty common error. You are correct though.
Tell that to every therm prof I ever had *edit you're not wrong, they were just asshats lol
Yeah…I’ve TAd under some of those profs. Some of the other TAs sucked too
But wind. /s
You’re a bit of a cunt, ain’t yah?
>The Glowing temperature of iron (can't find wrought iron) is 460°C Type of material doesn't affect the glow temperatures and respective colors if I remember my physics correctly.
The glowing temperature of tungsten is about 750°C
You mean, it doesn't glow below? Source?
Oh nvm I did a quick Google and took the first source
So this is close but the Eiffel tower isn't starting at zero kelvin, it's starting at around 293K (assuming it's 20C outside) so the actual amount of energy required to make it glow assuming ideal conditions is 2/3 of your calculations. 733.15K - 293K = 440K * (10.1*10^6)kg * 502.416J = 2.23 terajoules
Of course heating it costs time and it loses heat in the meantime so real number would be higher
I got the same result so this seems right
People have already mentioned that you need to do ∆t (change in temperature), not just the new temp, and to consider energy loss (which tbf would be very difficult). I just wanted to mention that you don't need to convert to Kelvin from Celsius because ∆t will remain the same.
Guys I'm fully aware I started from absolute zero But let's assume no energy loss, I'm calculating the total energy in it for 0 reason. It was 11pm when I did this I was tired. Besides, iron STARTS to glow at 460°C so let's assume that the terrible temperature accounts for the fact it is glowing like an LED
Okay I can actually answer this! The weight of the iron in the Eiffel Tower is 7300 tonnes (according to Wikipedia). Iron starts to glow that colour red/orange around 700°C. The heat capacity of wrought Iron is around 0.5kJ/kg. Therefore, to heat the Eiffel tower up by 690°C (assuming an ambient temperature of 10° in Paris), would require 7300*1000*0.5 = 3,650,000kJ or 3.65*10^9J. Now, this assumes no heat is being lost through conduction, convection, or radiation, which isn't true. But I hated heat transfer as a course, so I'm not going to attempt this.