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-2
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0answers
70 views

Skeptical of the “Cannon Shot Rule” [on hold]

What I consider a highly suspect figure was imparted to me today in a lecture and it very immediately did not sit well with me. To wit, this cannon shot rule (see here for a reproduction of the ...
1
vote
1answer
43 views

What is the spectrum of a nuclear bomb in a vacuum?

This question about 'nukes in space' mentions that the two forms of energy released from a nuclear bomb come from neutrons and photons (the latter about 104 times the former). It's mentioned that the ...
0
votes
1answer
145 views

Nuclear explosion wavelength data

I am looking for data source (or chart) of spectral data that is being emitted on detonation of nuclear or thermonuclear explosion. Reason I am looking is to see if this data has specific signature ...
8
votes
0answers
66 views

Why exactly does molten NaCl explode, when it is poured into water?

Why does molten NaCl explode, when it is poured into water? NaCl has high melting point, 1074 Kelvins (801'C). NaCl has molar mass 58.44 g/mol, it has specific heat capacity 36.79 J/(Kmol) = 629.53 J/...
1
vote
2answers
45 views

Is it possible to make iron shavings to be dust? [closed]

I'm considering how to separate iron shavings from iron. In the picture, there are some iron chunk and iron shavings. The problem is iron shavings are not dust. I want to make the iron shavings to be ...
6
votes
2answers
2k views

Nuclear bomb power - myth?

I'm not experienced in physics yet (if it helps I've covered as much as acceleration, momentum and energy transfer/chemistry ionic and covalent bonding) but I've heard that the way people compare ...
0
votes
3answers
297 views

What decides the trajectory of shrapnel upon explosion?

What are the factors that govern over the path that shrapnel and/or other particles follow upon explosion of explosives(the ones that are planted i.e. stationary ones) etc. Is it possible to predict ...
2
votes
2answers
1k views

What would happen if a hydrogen bomb were to explode in Saturn's atmosphere?

Purely hypothetical since any kind of testing in atmosphere/space is banned by international legislation/agreement. The humans have already bombed Luna so ... what could be expected to happen on ...
2
votes
0answers
26 views

Sedov-Taylor blastwave resources

What are some resources for learning about blast waves? Particularly the Sedov-Taylor solution? The specific application is modeling supernovae.
9
votes
1answer
135 views

Why does paper explode when compressed?

Various videos online show paper/card suddenly releasing energy in an explosion like way and transforming into a brittle material when put under sufficient pressure from presses. Examples are shown ...
9
votes
1answer
285 views

What happened to this folded paper in a hydraulic press?

The video below apparently shows a man folding an A3 size piece of paper 7 times, putting it under the hydraulic press each time. After 7 folds, on the last press, the paper sort of explodes. What's ...
0
votes
1answer
46 views

Effect of a nuclear weapon on the Moon

In some science fiction novel, there is the scenario of using nuclear weapons to deflect an Earth-approaching asteroid. But the question is, is a nuclear weapon really as useful on the moon or an ...
3
votes
2answers
238 views

From which height the effect of nuclear bomb will be Greater?

Well I was wondering like during war some of them drop nuclear bomb on ground and then it explode and we see a huge blast which causes so much of destruction but my question is that is it possible ...
0
votes
3answers
26 views

Are polished materials (say concrete/stone), more impervious to surface explosions?

Maybe another way to word this / a specific example: Is an object's resistance to damage from an explosion at all effected by it's smoothness / lack of friction on the surface? Example: Say an ...
1
vote
1answer
125 views

Physics needed for a quite well understanding of nuclear bomb [closed]

I am an undergraduate student in physics and mathematics and one of my early dreams in physics was to understand the way nuclear weapons work. Is there a book which deals with the physics and the ...
1
vote
3answers
111 views

When a bomb explodes, does it momentum remain same?

If, from an aircraft, a bomb is thrown to an object placed at ground and bomb explodes before it hits the object, i.e if it explodes in the middle of its path, does it momentum remain same? I knew ...
1
vote
1answer
59 views

Atomic bomb explosion [duplicate]

What are those vertical filaments that form in the air whenever an atomic bomb is detonated? They are clearly visible in this movie at 3:08.
0
votes
5answers
116 views

Could we use nuclear bombs to generate electricity? [closed]

it seems the biggest problem with fusion power is confinement. on the other hand, we developed a fusion bomb in just a few years. i was wondering if it could be economically viable to use nuclear ...
0
votes
1answer
45 views

Would High Explosive helped free Shackleton's ship, trapped in pack ice?

This question is based on physical concepts regarding presssure waves and crystallography, but I thought it might be helpful to include a brief historical context first. From Wikipedia: Loss of Polar ...
2
votes
1answer
350 views

Why is pyrite so explosive when heated? [closed]

I watched this video where fool's gold was heated using a hydrogen torch. The results were surprisingly explosive. I was expecting it to just melt into a puddle. Is there something special about ...
1
vote
1answer
49 views

Why blasts/explosions hurt people

This seems a stupid question i know but can't really understand the physics behind it. Let's imagine i'm 5 meters away from a bomb and it explodes. Putting apart the high speed projectiles behaving as ...
-2
votes
1answer
49 views

Exploding screen [closed]

I not quite sure if that's the right place to ask. Feel free to suggest a better place. So the phone of a friend suddenly "exploded" causing the following: I've just seen the picture. This ...
7
votes
2answers
3k views

How many grams of explosive are equivalent to the energy in a battery?

In the movie Terminator 3: Rise of the Machines, Arnie's fuel cells were twice shown to be extremely devastating when their stored energy was released. In real life, how many grams of, say, gunpowder ...
36
votes
2answers
3k views

Cause for spikes in trinity bomb test

In Richard Rhodes' book, The Making of the Atomic Bomb, I was reading about the Trinity nuclear test. High speed photos were taken and this one is from <1ms after the detonation. The book mentions ...
1
vote
2answers
148 views

Is there a difference in the energy output of a nuclear fission reaction as opposed to fusion?

For example, if I split a Helium atom will I get the same amount of energy as when I fuse Hydrogen into Helium? If there is a difference, what will be the difference (in general not according to ...
3
votes
1answer
76 views

Fission bomb: How much of it burns?

I am wondering about measured data on how efficient fission bombs were say the first ones. Since the fission in chain reaction releases large amounts of energy in fractions of a second, I imagine ...
2
votes
3answers
453 views

What decides the velocity of a bullet coming out from the gun?

I was concerned about what determines the speed of the bullet coming out from the gun. Is it determined by the strength of the explosive or how fast does it burn up? For example if we take the same ...
30
votes
6answers
6k views

Is there any aspect of an explosion resulting from a nuclear weapon test that cannot be simulated using super computers?

This Washington Post news article states that with the advent of computer simulation of nuclear tests, live tests are no longer needed. Generally speaking there are 3 aspects of an explosion ...
0
votes
0answers
32 views

Dimensional analysis of explosive energy, no temporal element

I have a question about dimensional analysis, using the calculation of the explosive energy of the Bomb by Taylor in the 1940s as example. I am neither physicist nor mathematician so will have ...
3
votes
1answer
66 views

Estimate post-shock temperature of nuclear explosion

I was recently shown a very interesting sequence of images depicting the expansion of the fireball of Trinity explosion, a nuclear weapon's test conducted in New Mexico in 1945. I read here that ...
-2
votes
1answer
51 views

Is this scenario true (too long to write in question)? [closed]

Imagine I were to lock myself in a 1×1×3 (meters) box. And this box was made of some newly discovered material which was projectile-proof (bullet proof), could ...
1
vote
1answer
98 views

Why are exploding HHO bubbles louder then pure HHO?

We tried my electrolyzer with a friend today, we filled a small bottle with HHO gas, and set it on fire. It was loud but not a big deal, like a firecracker. Then we added some soapy water and created ...
1
vote
2answers
739 views

What is physics behind of explosion under Atmospheric pressure?

An explosion is a rapid increase in volume and release of energy in an extreme manner. A blast wave in fluid dynamics is the pressure and flow resulting from the deposition of a large amount of energy ...
0
votes
0answers
131 views

How to measure the initial velocity of a potato gun?

I have made a 2m potato gun (It's like a cannon - the noise makes your ears buzz for some second :) ) Its uses alcohol as fuel. an igniter fires. then the potato will be shot out. anyway. as it's ...
3
votes
3answers
1k views

Conservation of momentum and energy in an explosion

One simple problem is physics is to determine the mechanical energy difference after an explosion. To do this, you must assume that momentum is conserved because in a explosion you have internal ...
4
votes
3answers
550 views

What was the amount of energy released in the 9/11 terrorist attacks?

I read somewhere on the internet that the amount of energy released by the terrorist attacks on the twin towers on 9/11 should have been of the order of 100 tons of TNT. This number surprised me, ...
18
votes
3answers
858 views

Why do nuclear bombs make a mushroom?

Atomic bombs make mushroom. It's well-known and we've seen many images of atomic experiments around the world. My question is, what causes the mushroom shape? Do conventional explosives like TNT and ...
26
votes
4answers
9k views

Is a bomb's shockwave strong enough to kill? [closed]

I'm watching a movie, The Hurt Locker, and the first scene shows an IED explosion which kills a soldier. Of course movies don't depict explosions with maximum realism, but I noticed the debris and ...
1
vote
0answers
23 views

Fermi's yield estimation of the Trinity Test [duplicate]

In Enrico Fermi's eyewitness account of the Trinity nuclear test in 1945, he gives a brief description of a method that he used to estimate the blast energy of the test: About 40 seconds after the ...
5
votes
1answer
9k views

short circuit an alkaline battery

i'm not doing anything related to physics, but i'm just curious : What really happen when i short circuit an alkaline battery ? some article in the net shown that fire/explosion can be happened when ...
37
votes
3answers
7k views

In atomic bomb tests under ground, where does the volume of the rocks go?

Underground atomic bomb tests are done in a deep, sealed hole. Not all underground tests eject material on the surface. In this case, they are only noticeable as earthquakes, according to german ...
23
votes
2answers
2k views

Why does a nuclear explosion have directionality?

It just occurred to me that almost all images I've seen of the (in)famous mushroom cloud show a vertical column rising perpendicular to the ground and a horizontal planar ring parallel to the ground. ...
3
votes
1answer
91 views

What are the minimum necessary conditions for a static shock to ignite wood or grain dust in the air and cause an explosion or fire?

Every once in a while I hear in the news that a grain elevator exploded and burned down because of a static shock that ignited the dust in the air. I also hear about the danger of the same thing ...
0
votes
1answer
288 views

Nuclear fission or fusion occurring at or near the speed of light

Suppose a device or object were traveling at or near the speed of light, and fission or fusion occurred while in this state of motion, creating an enormous blast, what would occur? Would this cause an ...
4
votes
2answers
85 views

Determining average number of fragments created upon explosion

Suppose you're analyzing some 3 dimensional object of any sort of shape, and this object explodes from some internal force (e.g, like a grenade). How would you go about determining the average number ...
1
vote
0answers
46 views

Does the force of releasing the latch of a spring-latch contraption affects the force generated by the spring?

There is this contraption in my class, where a rod is attached to a latch and a spring. By pulling the latch back behind a piece of metal, the latch is secured, the rod if pulled back and the spring ...
3
votes
3answers
219 views

Why do nuclear weapons create a blast wave?

As far as I know, in a nuclear explosion the energy is released in the form of radiation (neutrons, gamma rays, alpha particles and electrons), light and heat. There isn't a chemical reaction that "...
1
vote
1answer
65 views

Tsunami effects of a nuclear explosion

Sea surface nuclear explosion arouses a tidal wave of water. How does this kind of wave compare to naturally occurring tsunamis? E.g. what would be the potential of a 100KT bomb 100km away the from ...
0
votes
2answers
65 views

Do the nuclear reactions produced by different elements release different amounts of energy?

Does the nuclear reactions in an element like Uranium produce a different amount of energy than the nuclear reactions in Plutonium? I am not concerned with those elements in particular, they just seem ...
0
votes
2answers
117 views

Why does a lump of explosive burn's with an explosion?

When we light a solid lump of explosive it burns slowly layer by layer, but when we light up powder form of explosive it just burns with a huge explosion and sound why does it happen. And one more ...