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20
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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. ...
16
votes
4answers
1k views

What determines the pitch of an explosion?

It's bonfire weekend here in the UK, and everybody is intent on shooting fireworks. I was wondering, what determines the pitch of the sound produced by an explosion? The sound has clearly a ...
10
votes
3answers
439 views

Why do meteors explode?

A report on the Chelyabinsk meteor event earlier this year states Russian meteor blast injures at least 1,000 people, authorities say My question is Why do meteors explode? Do all meteors ...
10
votes
4answers
517 views

Explosion in space

I'm curious about what happens if an explosive substance detonates in space. On Earth, I guess a good chunk of the energy released is carried away by shock waves in the atmosphere. But in space, the ...
9
votes
3answers
1k views

If you throw dynamite into a pool of lava, will it explode or melt?

I was playing a table-top rpg with a friend. It was set... well it was pretty weird, so I won't get into it. Suffice it to say the bad guy had a stick of dynamite and we were on a volcano. I hit the ...
7
votes
3answers
2k views

2013 Russian meteor event, Sonic Boom or Explosion Boom?

In the lastest meteor event in Russia there was a big BOOM heard long after the meteor had passed. In this youtube video we can see at 4:30 the Meteor passing.. then hearing the BOOM at 7:00 , 150 ...
7
votes
1answer
469 views

How does nuclear war look like from space?

As today's the 29th anniversary of possible Armageddon, had Mutual Assured Destruction taken place, with the USA and USSR exchanging most of their nuclear arsenal, what would someone In low earth ...
5
votes
2answers
1k views

Do brick walls effectively protect against ionizing radiation from a nuclear explosion?

Of course it depends on the distance and the amount of radiation, so let's say its about 10,000 Rad. Now, can wall made of brick protect someone behind it from such radiation ?
5
votes
1answer
179 views

What is the name of the temperature limit beyond which an explosion will form a mushroom cloud?

Many months ago I saw a picture that was taken many years ago of an explosion, possibly in the Atlanta area. If I recall the explosion was caused by fuel in railroad cars. However, the explosion ...
4
votes
1answer
3k 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 ...
4
votes
3answers
185 views

What's driving the bucket up?

Just saw this cool video from Plymouth University, which I actually found through Matthen's blog. They fill a plastic bottle with liquid nitrogen, screw the cap on, drop it in a bucket full of warm ...
4
votes
2answers
936 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 ...
4
votes
1answer
199 views

How can you tell a model explosion from the real thing?

Movies and TV shows frequently show buildings being bombed, cars blowing up, etc. Frequently these are really explosions of miniatures filmed up close. Aside from the speed that the explosion ...
4
votes
1answer
30 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 ...
4
votes
0answers
829 views

What really happens atomically in an explosion? [migrated]

Let's say a room is filled with butane, I then throw a cigarette into the room. What happens to the atoms/molecules of the butane when they are in contact with the heat from the cigarette?
3
votes
1answer
651 views

Question about a nuclear bomb test photo

What are those white lines connecting the ground to the sky on the left side of this photo? I've see these before in the nuclear bomb test films too. They're apparently already in place upon ...
3
votes
3answers
69 views

How could I determine the temperature at which an egg explodes

A while back, some friends and I pondered "what will happen to an egg if placed very near a campfire". So we placed an egg on a grill, approximately 12 inches above a real campfire. Something like ...
3
votes
1answer
86 views

Power of Shockwaves

My question is about shockwaves and their power when they are created/how do they lose their power? Let's say that we have ground 0 with 10 grams of TATP on it. The detonation velocity of TATP is ...
3
votes
2answers
372 views

Alcohol inside a container

Let's imagine a plastic container completely closed. We put alcohol inside it filling it at half. Now we make a hole to introduce 2 little Conductor one near the other so that they don't let the air ...
2
votes
3answers
151 views

Nukes with cup-sized mushroom clouds

A few sequential questions: Is it possible for a nuclear explosion to be small enough to produce a 250-ml (one cup) mushroom cloud? If so, how much uranium would that take? How close to the ...
2
votes
1answer
4k views

Basic explosion physics - determining force

I'm using a game engine that has a ton of physics stuff built in. What I am currently trying to do is to simulation an explosion with F force in an x,y coordinate system and figure out how other items ...
2
votes
3answers
160 views

Armageddon prevention

I was watching the movie Armageddon and it made me think of a few things. We would probably not need to send a crew to blow the asteroid in two, I think we could still send a warhead with enough power ...
2
votes
1answer
40 views

Trying to understand explosions

I’m trying to understand the nature and amount of energy/force generated in an explosion. Take, for example, the explosion that results from the complete annihilation of one gram of matter, releasing ...
2
votes
2answers
71 views

How to meaningfully describe the practical effectiveness of one large bomb versus a series of many small bombs, all else constant? [closed]

Background: Given two sets of conventional bombs (constituted of fuel which explodes by way of chemical decomposition reaction) : Set 1 - One shell of a given volume encasing a given amount of fuel. ...
2
votes
1answer
115 views

A bomb can be made to explode or implode? [closed]

A bomb can be made to implode or explode. Can one be made to explode while creating a vortex at the same time?
2
votes
1answer
65 views

Cellular structure in solid phase detonations

For gaseous and liquid detonations, the detonation propagates by the energy released at the triple-points which form a cellular structure. This structure is traced using a soot foil during ...
2
votes
1answer
127 views

decay time for a blast wave

The blast wave that is formed as a result of an explosion has some import parameters. One of them is the peak pressure which is basically the pressure measured when the blast wave arrives at a given ...
2
votes
1answer
41 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 ...
1
vote
2answers
466 views

Antimatter bomb

I stumbled upon this wikipedia article on antimatter weaponry. Being greatly appalled by the sad fact that large sums of money are being wasted on this, I could not stop myself from thinking for a ...
1
vote
1answer
158 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 ...
1
vote
2answers
103 views

Can a bullet leave a gun and tumble to the ground?

This question seems to have been asked a few times in different configurations, but none of them answer my variation. I've struggled to understand this for nearly 15 years and had conflicting answers ...
1
vote
2answers
42 views

Explosive energy in a container [closed]

What happens when the explosive energy of a grenade or a bomb is contained in a container, if you will, and no energy can be released through the container in the form of heat or sound etc...? Just ...
1
vote
2answers
139 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 ...
1
vote
1answer
120 views

Is there a sound that explodes gunpowder? [closed]

Is there a certain frequency of sound/noise that will cause gunpowder to explode?
1
vote
0answers
30 views

How to find momentum of different pieces of the same object after it explodes?

If a stationery object explodes into a specific number of pieces due to internal force, how can I find the momentum of these pieces?
1
vote
0answers
52 views

If air was significantly compressed, and then the force compressing it suddenly disappeared (no container), what would happen?

Question: If air was significantly compressed, and then the force compressing it suddenly disappeared (no container), what would happen? Side Question: I'm imagining significantly compressed, but ...
1
vote
0answers
88 views

scaling laws for density and temperature of high-energy explosions

I'm wondering if there are heuristic ways to derive how the peak density and temperature of nuclear explosions scale with the amount of fissile/fusible material. Does it matter what the explosion ...
0
votes
3answers
349 views

the sounds of an exploding star

We know that space cannot spread a sound wave as there is no "air" or a medium that would support the spread of a sound wave. However if we put ourselves in the vicinity of an exploding star, would it ...
0
votes
2answers
6k views

What would happen after the collision matter and the anti-matter [duplicate]

Possible Duplicate: What actually happens when an anti-matter projectile collides with matter? Suppose 1 kg of a stray meteorite anti-matter moves to the earth. What would happen after ...
0
votes
1answer
51 views

How powerful would an explosion have to be for its effects to be felt worldwide?

If an explosion were to occur at any point on earth, how powerful would that explosion have to be for it to be audible or otherwise detectable by every person on the planet? Detection could mean ...
0
votes
1answer
89 views

Can a single atom explode?

Does the definition of an atomic explosion require the interaction of two or more atoms, or can a single atom be the source of an explosion? Another way of phrasing the same question. Can there be an ...
0
votes
1answer
103 views

Impact Force versus Non-impact force why are they so different?

A mass that has velocity and a force f1, can create a sound and even break a wall upon impact. However if the same force f1 is applied to the wall without any motion (velocity) then the wall will not ...
0
votes
1answer
26 views

Determining the force of an explosion, is it external or internal?

A time bomb put inside a box is left into the vacuum: it explodes...the box coverings starts moving I want to ask: is the force behind sudden acceleration internal or external I am confused about ...
0
votes
1answer
193 views

Is it true that a Space Shuttle launch is powerful like an “average” nuclear explosion?

Kind of an odd question here. First let's define what an "average" nuclear explosion is, because that's quite a controversial term - "average". Considering that the peak of nuclear tests was at the ...
0
votes
1answer
80 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 ...
0
votes
2answers
168 views

Remnant of a supernova

i explain better A supernova remnant is the structure resulting from the explosion of a giant star . The supernova remnant is surrounded by an expanding shock wave that is formed from material ...
0
votes
1answer
19 views

What causes destruction in the first few seconds of a bomb explosion?

When a bomb explodes (or a grenade, mine, etc.), what is it that causes the most damage in the first 1 or 2 seconds of the explosion and culminates in the destruction of nearby objects? Is it the high ...
0
votes
0answers
46 views

Decay rate of overpressure for a nuclear blast (shockwave) over an urban area?

I have come across a very new idea for me concerning nuclear weapons effects, check this please. In brief, that person states that blast overpressure attenuates/decays by causing damage for each ...
0
votes
1answer
100 views

How would one best dissipate or absorb shockwaves and pressure caused by an explosion within a confined space

I am trying to find a way to limit the effect that detonation of an explosive gas, introduced into a confined space would have when detonated. Can one introduce some form of panelized material or ...
0
votes
0answers
53 views

absorbing energy from explosion

The other day in physics, we went to visit a workgroup that was developing a wall that would absorb energy from explosions (it was a joint project with the military academy). The first prototype they ...