Questions tagged [explosions]

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4
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2answers
342 views

How would a nuclear explosion look in vacuum?

Approximately, how does the specific luminosity, $L_\nu(t)$, of a nuclear explosion in a vacuum look as a function of frequency and more importantly, time? Assume the observer is very far away. If ...
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4answers
35k views

Would a pin head heated to 15 million degrees Celsius kill everyone in a 1000 mile radius?

The YouTube video How Hot Can it Get? contains, at the 2:33 mark, the following claim: A pin head heated to 15 million degrees will kill everyone in a 1000 miles radius. On what basis can this ...
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1answer
32 views

If our ears were resistant to the zero air pressure on the moon, could we hear a balloon explode there from nearby?

A big balloon filled with air explodes on the moon. Suppose we could bear the zero pressure on the ou there. Then the balloon explodes. Could we hear this explosion, from very nearby? A huge amount of ...
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0answers
30 views

If we let let explosives go off under one of the side of a skycraper, what will happen? [closed]

Imagine a skyscraper under which explosives are placed, but only beneath one of its sides. After detonation of the explosives, will the side under which the explosives were placed come crumbling down, ...
2
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1answer
399 views

What causes the expansion and implosion of the medium before an explosion?

I often see in slo-mo explosions, whether underwater or in air, the medium expanding outward before imploding, at which point the flash of the explosion happens. I used to think this was a cool movie ...
12
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1answer
14k views

How and why would a glass table break in this manner?

Recently, a relative of mine came to me asking me to explain a strange physics phenomenon. She had 3 glass tables; 2 small and one large arranged neatly such that the small tables were half enclosed ...
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2answers
616 views

Why do internal forces support conservation of momentum but not law of conservation of energy when a shell explodes?

When a shell explodes, we get several pieces with different kinetic energies but the momentum is conserved since no external force is acting. But the sum total of the kinetic energies of the pieces is ...
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2answers
629 views

What makes a fusion reaction an “explosion”?

The Lawrence Livermore National Laboratory just put out a bunch of movies of atomic bomb detonations. How does the nuclear reaction generate the destructive shockwave that can be seen? If it just ...
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3answers
360 views

Is it impossible for reactor grade uranium to be detonated?

So, this is a question that has been puzzling me for numerous reasons. Be it for advocating nuclear power, or getting a bit of nerd rage when watching a sci-fi work, or having an argument with someone....
3
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1answer
135 views

Behavior of a ignited drum of gunpowder

To get the immediate question out of the way: We were playing a Pen & Paper RPG and it "just happened". Question Take a 200 Liter Standard Steel Drum, fill it with gunpowder, remove the lid and ...
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0answers
94 views

detonation and deflagration in supernovae

I'm reading about supernovae processes. The article mentions that there are these two processes in combustion, detonation and deflagration. The article goes on to state that the fact that a wide ...
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1answer
359 views

Hydrogen & Noble Gases in a Microwave

I was watching some Youtube videos of people microwaving helium and neon in a microwave. I could not find anything showing hydrogen in a microwave. However, as I was watching the videos I noticed ...
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1answer
2k views

Why isn't there any impulse due to gravity?

Whenever we consider an explosion of a projectile in air, we solve for the velocities of the exploded elements by using the Law of Conservation of Momentum (ignoring any sound or light effect here). ...
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2answers
229 views

Conservation of linear momentum after explosion with friction

Let's say you have a bomb at rest submerged in a liquid. It then explodes into two equal fragments A and B which leave in opposite directions. If we ignore the fluid and any sound or light we can ...
38
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1answer
3k views

Nuclear bomb mushroom cloud with trumpet formation

I have found this specific image here (Loong found out that it is the Soviet Joe 4 test of the 400 kiloton RDS-6 warhead at the Semipalatinsk test site on August 12, 1953): Also an impressive Youtube ...
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2answers
1k views

How is the temperature of a nuclear explosion determined?

Recently I have become interested in black-body radiation. I knew of this and color temperature, but I didn't quite understand any of it. I admit I'm still learning. I've thought about the Sun's ...
4
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1answer
466 views

Was the Strontium-90 found in Godzilla's footprints a by-product of nuclear fusion?

In the movie Godzilla at one point the scientists discover a residue of Strontium-90 in Godzilla's footprint. In the ensuing report to the Diet a scientist announces that this is evidence that ...
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1answer
277 views

What make an egg explode in the microwave

I think it's related to the air pouch in the egg, but I'd like to have a full physics explanation. What are the forces in presence? What are the tricks to prevent the explosion?
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1answer
971 views

Applying conservation of liner momentum on a firework's explosion

A firework of mass 1 kg is placed on the ground and ignited. The impulse created by the explosion causes it to move vertically upwards with an initial velocity of 50 m/s. After 4 seconds a 2nd ...
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1answer
89 views

Difference of density ratio in 1D detonation(C-J point) and 1D normal shockwave as p2/p1 goes infinite

1D detonation equations: $$ \rho_1u_1 = \rho_2u_2 $$ $$ p_1 + \rho_1u_1^2 = p_2+\rho_2u_2^2 $$ $$ c_pT_1 + \frac{1}{2}u_1^2 + Q = c_pT_2 + \frac{1}{2}u_2^2 $$ 1D normal shockwave equations: $$ \...
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2answers
187 views

Strange Light in Underwater Explosion

I was watching this slow motion video of an underwater explosion (1:03 - 1:15) and I noticed that at the beginning of the explosion, it gives off light, then as the sphere of the blast expands the ...
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1answer
2k views

Is there a formula to calculate the sound produced by an explosion?

I was reading about flash bang grenades, and I was really surprised to learn that in an M84 grenade there is only 4.5 grams of actual explosive (flash powder made from magnesium and ammonium nitrate). ...
2
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1answer
211 views

Conservation of momentum involved in explosions [duplicate]

Bomb explosion is an example for conservation of momentum.Initial momentum of the bomb or the system is said to be equal to final momentum of the system.How is this possible?The individual particles ...
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2answers
1k views

Nuclear Explosion Confined by Gravity?

When a nuclear device is detonated at ground level, we see the familiar mushroom cloud, which is undoubtedly caused by the weight of the atmosphere suppressing the upward thrust, causing the debris ...
2
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1answer
98 views

Does energy of explosion channelise?

Whenever there is an explosion inside a barrel of a gun, the bullet shoots off with the energy of explosion. My question is: Suppose $E$ amount of energy is liberated from explosion. Then, does the ...
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1answer
315 views

What if the Big Bang was an accident? [closed]

Is it possible that the Big Bang was the product of a fission of an infinitesimal particle produced by an advanced civilization that destroyed part of the universe, and that there are other parts of ...
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1answer
1k 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 ...
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2answers
379 views

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

Why does molten sodium chloride explode, when it is poured into water? $\mathrm{NaCl}$ has high melting point, $1074\,\rm K$ ($801\,\rm^\circ C$). $\mathrm{NaCl}$ has molar mass $58.44\,\rm g/mol$, ...
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2answers
123 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 ...
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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 ...
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0answers
73 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.
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1answer
2k 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 ...
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1answer
98 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 ...
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1answer
261 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 ...
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3answers
62 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 ...
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3answers
9k 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 ...
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1answer
189 views

Vertical filaments during 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.
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5answers
3k 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 ...
2
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1answer
129 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 ...
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1answer
3k 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 ...
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1answer
103 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 ...
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1answer
482 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 ...
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1answer
98 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 happened ...
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2answers
6k views

Cause for spikes in Trinity nuclear 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 ...
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1answer
212 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 ...
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2answers
1k views

Can a black hole explode?

In the nature many objects and processes have a critical point (like the more mass an object collects). Logically is that inside black holes the more violent things happen the more matter is inside. ...
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1answer
571 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 the ...
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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 ...
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1answer
59 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 ...
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1answer
261 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 ...