Categories
learn science

26 asteroids exploded in Earth atmosphere in the last 13 years


26 asteroids exploded between 200 and 2013 in Earth’s atmosphere and 7 among them were more powerful than the Hiroshima bomb. Nuclear Test Ban Treaty Organization‘s detection network of over 85 stations located around the world found the locations of each such explosion.

The question arises: how can we find out when the next meteroid will strike? How can we find out when the next asteroid that can wipe out a city will strike? The answer is: we can’t.

B612 Foundation wants to change all this with their Sentinel program, in which a satellite will be launched with the sole purpose of detecting asteroid that are bigger than 150 meters in diameter and then report this to Earth. Yay, B612 are good guys!

Categories
learn on the web

Slo-mo madness: see the explosion shockwave as it travels through the air at over 600 m/s


The guys at Earth Unplugged have made an interesting experiment: to see how fast an explosion shockwave would travel. As it turns out their experiments indicated a speed of over 600 meters per second, almost twice the speed of sound.

The explosion shockwave creates a compression wave and a sonic boom. If you were to ask why do people die in explosions, it is not only the area of the explosion (the space where you see the flames and the gas bursting) that kills you, it is also this very shockwave that goes through your body and ruptures everything inside you. Kaput.

So, stay clear of explosions. Maybe a cushion might help in the fight with explosions, though. 😀

Categories
entertainment

Cannonball vs Car – 1 : 0 [video]

Rated RR has some awesome episodes about firearms, explosions and, of course, cannonballs. In the video above he tested an age old weapon agains a car. Of course, the car gets trashed in no time, even when the cannonball simply goes through the engine and then flies out from the back of the car.

Now some physics. Rhett Allain, Associate Professor of Physics at Southeastern Louisiana University, wrote a very nice piece of article on Wired about the Mythbuster cannonball that went on a 800 m jump between houses near the firing range.

His calculus says: in order to slow down a 5.5 kg cannonball that is flying with about 300 m/s you would need about 2 m of water. And that is to slow it down to 100 m/s. Did you know that bullets fires in water will disintegrate after 2-3 meters in water? The change of medium air-water is occurring too fast and thus, the bullets simply get crushed.

And, if out of curiosity, you wanted to know what terminal velocity would a skydiver have, simply use this calculator. This differs form the cannonball situation because the motion is only downwards and it does not imply horizontal velocity.

Science is great!

Via [Gizmodo].

Categories
entertainment geek

Blow up things with The Mythbusters [dubstep video]

I guess everyone wants to be like The Mythbusters, to check theories and, from time to time, to simply blow up thing because they want, the can and, of course, it is darn fun.

Discovery channel has made a great thing by promoting science and methods to prove theories using the awesome team that has Adam Savage and Jamie Hyneman at its core. Enjoy science with things being blown up, by Mythbusters 😀

Via [Neatorama].

Categories
entertainment

Slo-Mo Reveals The Awesomeness of Fireworks In Your Room [dangerous and fun]


Filmed at 2500 frames per second the destruction and explosions seen in the video above are all about art. An d about Explosions and so forth. You get it. I can never ever get bored of these.

From Danish TV show “Dumt & Farligt” we see how some people have more fun than others. You will see a waterbed wasting its water in a room, fireworks exploding in the house, wine exploding in the microwave and many more. Have fun. Via [Neatorama].

Categories
entertainment infographics tech

Let’s blow things up – science way and bayhem way [video + infographic]

The Ubyssey shows us some interesting explosions that people may do at college or school. Note: do not do this at home. Interestingly you can see what substance does ka-boom in contact with water. May I say that I’m just loving it? I love science.

And now let’s see some explosions from the movies Michael Bay has done. Thanks to Neatorama for the news. And they all are in an interesting infographic. click on the image below and enjoy Bayhem, the explosions from movies like Transformers or Bad Boys. Boy, those movies were damn good. Did you watch Tranformers 3?

bayhem-explosions-infographic-video