My Second Try

"I got a kick out of succeeding at something I wasn't supposed to be able to do"-Feynman (Surely you're jocking Mr. Feynman)

R S E I U B

Yesterday I read about a nice way to reboot the system when xserver freezes. The reboot commands are based on magic SysRq keys. It says that holding the keys Alt+Print(key in the keyboard) and typing RSEIUB will reboot the system. You can find the actual source here. It really worked for me. Simply Alt+Print+B will reboot the system, but this RSEIUB sequence will do some additional thigs to make a clean shoutdown. Funny thing is after reading that article, people complainning that they have such a small hands to execute that comand, which means that they were trying to prss all the keys simaltaniously. lol :)

My first try

It's not a toy

The concept of angular momentum is one of the examples of non-Intuitive physics. With out sufficient mathematical knowledge and imagination power, its hard to understand gyroscopic precisions. One of the flying machine which uses this concept of angular momentum and torque is helicopter. Its a complex machine to understand. Simply attaching a rotor to a helicopter like body will not work. Angular momentum has to be compensated. Last week I bought picooz, a miniature helicopter. Its design is wonderful, it has a tiny rotor with a tiny motor in the tail to produce torque to avoid spinning. Controlling this toy, (I don't want to say its toy, its a flying machine), is not so easy. First one has to understand why it is spinning. There are two rotors spinning, so we can see nice addition of angular momentum, and the resultant. Sometimes I could see superpositions of different movements, resulting something like lissajous figures.
In the beginning it will start spinning wildly, because of the angular momentum produced by the main rotor. Then by adjusting the tail rotor rpm we can reduce the spinning and slowly it started circling. By fine tuning the rotor rpm we can increase or decrease the radius of the circle. Practically it is possible to make the radius infinity(thats the physicist way of saying that its going in straight line). Anyway its lot of fun with lot of physics.

In this video here I try to bring the helicopter in the field of view, so I made it spinning so that it stays at a place. Then I apply torque to avoid spinning then its started circling,.I try to increase the radius of the circle, but it crashed in to the wall :( . No casualties ..:)

Micro Black Hole

My last post was about a super massive black hole in the Milky way galaxy.This post is about a possibility of creating tiny little micro black hole on our Earth. There are many interesting discussions going on about the safety of LHC(Large Hadron Collider) in Geveva, world largest particle accelerator. A recent article tittled as "The end of the world at the Large Hadron Collider" gives the summery of speculation theories.
Even though physicists are NOT denying the possibility of creating micro black hole at LHC, they say its not dangerous since it will undergo self destruction immediately by emitting Hawking radiation.

I would also like to record my point of view in this regard. The main purpose of LHC is to verify several theories mostly particle physics and quantum gravity theories. Until now most theoretical models were accepted because of two facts. First they could explain the phenomena in a correct way, second there is no counter example which means its NOT disproved. The reason for the second fact is that we don't have enough experimental facilities to do controlled experiments in quantum scale in order to verify a theory. So for the first time they are going to test and verify their theories at LHC by doing some quantum mechanical experiments. We believe that our theories could better explain the nature, but the non intuitive outcome of quantum mechanical experiments always surprised the mankind several time.

As a bottom line, I would like to mention one thing " The only thing predictable in the nature(I mean in quantum world) is its UNPREDICTABILITY". Let us hope and wish safe experiments at LHC and I am looking forward to see mBH at LHC.
watch the video to get an idea

Super massive

Six years ago(2002), the word "super massive" found a right example. It was the discovery of Sagittarius A*, a super massive black hole in the center of our Milky Way Galaxy. Recently Astronomers confirmed it's existence. The numbers corresponds to this so called "super massive" black hole, will make us to think whether the word "super massive" is sufficient to describe the magnitude of it's unimaginable mass and physical properties.

It has mass of 2.6(+/-0.2) million solar mass, confined in a volume with radius no more than 17 light-hours.(Remember light hour is nothing in astronomy compared to usual distances measured in light-years).In order to show the magnitude let me calculate and express in kg. One solar mass is equal to 1.98892x10^30 kg. So 2.6 million solar mass is equal to
5171192000000000000000000000000000000 kg.

It's interesting to know how they detect the black hole, since nothing comes out(of course something is coming out called Hawking radiations) of a black hole. Its very simple, they observe the movement of stars. If they found stars mysteriously orbit around some invisible point, they suspect that there might be a black hole in the center. By calculating the mass of the orbiting stars and its period, they estimate the mass of the black hole using Kepler's Law.(Note: I am typing this article from the place where Kepler spent last part of his life :) ).

At last I would like to mention one very interesting fact, even though I don't believe in Astrology, I am now proud to say that my sun sign is Sagittarius.Have a nice day :)