pulkit

so imagine Voltage as speed (a ferrari) and Amperage as the bulldozer.

 

the volts may overcome the skin resistance (between 90 and 200k Ohms), but without sufficient current, the WATTAGE won`t be enough to kill (it may hurt like a b!tch, but not kill).

Excellent analogy drawn.

I can't use HNO3 because I don't have any and Do not know where to get it as it is virtually impossible to buy as it is one of the most common ingredience in most explosives now adays

Is nitric acid that hard to get ?

I used to get it easily even in my school labs, in fact I made aqua reggia several times in school for qualitative analysis.

Innocent people being given the death sentence by mistake will always be a problem.........but do you not think that those who acctualy commit heinous crimes deserve to die ?

Is there no need to clense society of such people quickly and efficiently ?

Life imprisonment does seem (atleast to me like) as a let-off for people who have say murdered "innocent" people in cold blood.

The way you come up with that is by expanding e^(i*theta), and then noticing that you can seperate the real terms and the imaginary terms into two seperate power series; one for cosine and one for sine.

What if you similarly expand say Sin(a+ib) and then try to solve the resulting terms or just try to sum them up?

It says atoms, not electrons, so I can only come to the conclusion that you were referring to atoms. If you knew that it didn't apply to atoms, then what was the point of the question?

I think you hit the nail right on its head there. Now that I think about it, this is exactly where I was going wrong.

The temperature thing was a classical equation applied to calculate average velocity of the atom assuming it to be a single body, where as the Heisenberg principle of uncertainty is a quantum mechanical equation applied to sub atomic particles. Confusion solved.

I have had a 2 1/2 year relation with calculus in which the first 2 years were spent in learning the basics and getting through with them. It was only later that I realized how diverse a field it becomes once you get into the depths of it. At first everything is nice and good with just 1 variable and you get into limits, diffrentiation, integration (definate and indefinate), differential equations and everywhere graphs turn up a lot (my favorite part). But then this is where I personally stopped enjoying because after this things started to get quite so difficult and arbitrary with multiple variables and stuff like that pouring in......... Incidentally the last 6 months all that I used calculus was for quantum mechanics (again you need an extreme knowledge of calculus to solve the Schrodinger equation even for the most basic situations as the harmonic oscillator).

The fact that you have no knowledge of calculus is good so that you can strat with such teach yourself stuff but just be carefull not to get caried away with stuff, because calculus will ALWAYS leave you with a feeling that you still have some knowledge missing. Weirdly enough the more advanced you into maths the more you tend to reach back to explain the basics (perhaps you can't appreciate this at the present moment).

pulkit, you really from India? how is that country doing by the way? looks pretty impovershed from the national geographic mags . . .

There is a great social divide between rich and poor India. Most people I have known through out my life have nothing to do with that impoverished look of India you hold in your mind (Living in a metropolitan helps), they are quite well to do infact, many can easily afford to get their children college-educated even in the US without schorlarships. In fact I often wonder why they always have to project India like that, they acctualy never focus on the "wealthier" side.

How much have you done in school/college ?

In that case I was referring to the atom as a single object, which wasn't moving. As a single object its position would stay the same and it would have no kinetic energy, if its position remained constant (as was the supposition in your first point), and that would seem to violate the uncertainty principle

Due to the size of an atom, its wave behaviour is quite over shadowed by its particle behaviour, and I have never before seen the heisenberg principle being applied to the atom as a whole. I was referring to the application of the principle to the electrons.

And the way to calculate the enrgy level of an atom is nothing but to consider it as a collection of electrons and a nucleus, generate the Schrodinger equation and then solve it. And if you have ever solved quantum mechanical situations you would know that the net energy of the atom (kinetic + potential) would depend completely on its constituents and their interaction. I would hence still have my doubts about saying that the atom would run out of all kinetic energy.

or an AC input and a rectifyer.............

A rectifier is a very simple circuit and generally does not suffice to give very nice DC voltage, it has got lots of AC ripples. The simplest of rectifiers can be made of two or four diodes and give out give out input in the form of |sin(x)| (mod sinusoidal function). You need to use some filters to filter out the excess AC character.

When a country decides to allow the death penalty and give its justice system the power to execute such sentences, I believe the risk of a unfair judgement will always be there.

There can't possibly exsist a perfect system in which only the guilty get the punishment.......... supose there were no death penalty, these so called innocent-convicts would still be getting a very severe punishment such as life imprisonment, how is that any better ?

Could you please tell me the names of some of the algorithms involved in such compression techniques ?

Yes sine,cosine and tan .

I supose it wouldn't work ion log because there are some conditions on the values that you can put into the expansion of a logarithmic function

A reason given for the death penalty here has been that it is used on people who seem to be irreversibly conditioned to commit terrible crimes. So presumably deterrents would have little effect either.

People like that constitute probably (and hopefully ) a verysmall percentage of society. The death penalty can certainly act as a detterent to the rest of society, so that they do not switch over sides.

I think the fact that you talk of certain amounts of currents being harmful is slightly incorrect.

At a given frequency of AC, a pearticular voltage would be enough to overcome skin resistance. If I recollect correctly, the normal household supply @ 50-60 Hz in most countries becomes hazardous at voltages beyond 120V, hence in several countries they prefer a 110V 60Hz supply.

DC voltages are not used primarily because of transmission problems, but they are exteremely harmful. Thats why one of its commercial uses is in electric chairs. But given that as already mentioned welding uses low voltages high current electric arcs, and DC currents of low voltages are often used for welding without any danger.

You can at least have the choice of death...I would be better if we had a criminal system like in the movie "Demolition Man" or "Tekwar".

Though I havn't seen these movies, I fully agree that there should be a choice given over the mode of death,i.e., lethal injection, electric chair etc.

But again, you can think of such a system being implemented in the developed world. Where I live (India) I do not believe they would care to give such choices considering that on average a death penalty would only follow a 10 year+ ordeal of court cases and appeals.........here theres just the single method of the old British days........."hanged till death"

If an atom has zero kinetic energy, it wouldn't be moving, but the electrons within it would still orbit and so there would still be some vibrations going on. Since the nucleus and electrons themselves are jiggling about their positions are never certain and so the uncertainty principle is obeyed.

What you just said here is grossely incorrect.

Look at it like this : If u have a collection of n particles forming a system in which all these particles have some arbitrary velocity, the kinetic energy of the entire system would be the sum of kinetic energies of each individual particle (kinetic energy is a scalar quantrity is another way to say this). Now the atom is nothing but a collection of these electrons and the nucleus, so if they are moving about how can you possibly say that the atom has no kinetic energy ? If the atom as a whole comes to rest all it will acctualy lose is momentum not kinetic energy if the electrons still continue to move about.

Can anyone please explain how video compression works ? And wether convertion to a compressed format necessarily result in loss of quality ?

1. Teach your self books: Calculus (to feed my obsession with the subject...)

I hope the origins of your interests in calculus are purely mathematical and not realted physics and chemistry. I say that because both subjects employ calculus as a mere tool, and the want of a deep understanding of physics/ chemistry often prevets you from treating calculus as anything more than that.

On its own calculus is indeed a very beautiful subject, but I always feel that a good teacher / guide will go a long way to enhance that beauty .......

I just saying its not your choice.If they want to die there suicide.

Hey the guy on death row already had his choice when he commited the crime, you can't have all the choices in life that'll just be chaos then.

Yes the documentary was very nice.

Finally American press that does not glorify war, and accepts that the US did kill thousands of innocent ppl in Iraq and Afghanistan. I loved it coz I alwayz thot of Mr.George W.Bush as a blood thirsty war-monger(this part is definately hereditary) with little or no brains.

And just as a foot note, while the carnage in Iraq was on, there was still free press left in this world (mostly not in USA) which showed the real fate of the Iraqi civilians.

Killing is wrong and bad and watever......... It is not right for the judiciary to take the life of another human .............

But then don't you feel the capital punishment is a very strong psychological tool as well, just knowing the exsistance of capital punishment in your country may deter you from a larger crime.

And given the severity of the crime one must commit to warrant a capital punishment judgement, why shudn't the person be killed, if nothing else then to just set an example

What if you took the series expansion of the function (MacLauren series), and plugged the complex/imaginary number ............

I think thats a way to end up with e^(i theta) = cos (theta) + i* sin (theta)

Theoretically a larger molecule again with 1/2 the electrons in its outer shell in a crystalline structure would be harder, but it may be impossible to make, a diamond made from americum etc. theoretically speaking though, are there any large (+90 atomic no.) that have 1/2 shells on the outside?

Silicon i believe is a larger molecule with half the electrons in the outer shell, and shares a lot of properties of carbon lying in the same group of the periodic table as Carbon.

However, it does not have a form harder than diamond.

I really don't think you can say that there would be 0 mass, merely because there are several quantum mechanical situations where the ground state has a non-zero energy. (Even the simplest of all quantum mechanical problems, the particle in a potential box has a non-zero ground state energy or zero point energy)

No mass, no volume, yet possession of some energy, how do you explain that ?

I was just curious to know wether the trignometric functions and the log / antilog functions are defined for imaginary and complex numbers....and if yes then how are they defined ?