A spring called: Drop of water

Written by K.A.Cassimally


Do you know what happens when a drop of water hits a non-absorbent surface? Yeah youíre right (if you donít haverepparttar answer, please re-readrepparttar 127667 title of this column),repparttar 127668 drop bounces upwards.

A French scientific team fromrepparttar 127669 Collēge de France have studiedrepparttar 127670 scene carefully with a camera that took 40000 images per second. Here arerepparttar 127671 results: At first, when it hitsrepparttar 127672 surface,repparttar 127673 drop flattens. Then, it bounces up due torepparttar 127674 movement energy it had when falling down. The drop will continue going upwards eventually takingrepparttar 127675 shape of a needle. Afterwards,repparttar 127676 drop falls upon itself, into itself. It thus takesrepparttar 127677 shape of a pancake (again) but this time,repparttar 127678 drop is in midair.

This phenomenon is different to a drop falling on other surfaces as in this case,repparttar 127679 drop crashes onrepparttar 127680 surface leaving only a small quantity ofrepparttar 127681 water to bounce up. Physicists have also found out thatrepparttar 127682 actual speed of a drop influences its deformation but notrepparttar 127683 time taken for it to get in contact withrepparttar 127684 surface. This actually depends uponrepparttar 127685 mass ofrepparttar 127686 drop.

Space Pollution

Written by K.A.Cassimally


I bet you havenít ever wondered about pollution of space. Yes, man started polluting space ever since Yuri Gangarin (first man in space) saw Earth in its entirety.

Earth is not only orbited by satellites but also by paint particles, pieces of glass and even apparatus used by astronauts inrepparttar past. These may be small (thatís what we think Ė I mean maybe thereíre not) but note that if ever a spanner were to hit an astronautís face shield,repparttar 127666 latter would break down into fragments. The astronaut would, for his part, go straight up to heavens (or down in hell) and there would also be even more pollutants in space (the shield fragments).

Now, for those of you who have ever bothered to reflect upon space pollution, did you know that microscopic fragments also make uprepparttar 127667 space pollutant family? I didnít until I read an article (link below) from The Guardian newspaper.

Anyway, where was I? Yeah, there are even more things out there that are considered as pollutants. I read about particles invisible torepparttar 127668 human eye and undetectable by Earth radars. Best thing though: they haverepparttar 127669 explosive power of a bullet!!!

With more and more satellites, probes and men in space, no doubt that pollution is going to rise. We really have to prevent this. How? Till now, space pollution has not proved to be a major threat to us, inhabitants ofrepparttar 127670 earth. So, naturally there does not appear to be any hurry to find a solution. NASA though has put a small probe in a swarm of space debris so as to know them better. But as I just said, nobody is really caring about space pollution right now although I should think that in some fifty years (ok, maybe Iím exaggerating), this may well transform into one of those many threats to life on Earth!

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