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Starting Anew- April 30th, 2008

Physics related Edits

In this section, I'll be keeping track of all major physics related edits I've made and will also try to outline the reasons for the edits.

In Uniform Circular Motion

Original:

The above picture shows a point of mass that is moving with a constant angular speed around a center. When the change in angle is ${\displaystyle \Delta \theta }$ , the change in displacement is ${\displaystyle \Delta }$s. Using the relationship of trigonometric functions, we find that,
${\displaystyle \Delta s={\frac {r\sin \Delta \theta }{\cos(\Delta \theta /2)}}}$

This equation is only valid when ${\displaystyle \Delta \theta }$ does not equal ${\displaystyle (2n+1)\pi }$ where n is integer.
Similarly, the magnitude of tangential speed is always the same. Let ${\displaystyle \Delta v}$ be the change in velocity, v be the initial velocity or instantaneous velocity, and ${\displaystyle \Delta t}$ be the change in time,
${\displaystyle \Delta v={\frac {v\sin \Delta \theta }{\cos(\Delta \theta /2)}}}$
${\displaystyle {\frac {\Delta s}{\Delta t}}={\frac {r\sin \Delta \theta }{\Delta t\cos(\Delta \theta /2)}}}$

When ${\displaystyle \Delta t\to 0}$, ${\displaystyle \Delta \theta \to 0}$,

${\displaystyle \lim _{{\Delta t}\to 0}{\frac {\Delta s}{\Delta t}}=\lim _{\Delta t\to 0}{\frac {r\sin \Delta \theta }{\Delta t\cos(\Delta \theta /2)}}}$

${\displaystyle v=\lim _{\Delta t\to 0}{\frac {r\Delta \theta }{\Delta t}}}$
${\displaystyle v=r{\frac {d\theta }{dt}}=r\omega }$ (${\displaystyle \omega }$ is angular speed)
${\displaystyle {\frac {r}{\Delta s}}={\frac {\cos(\Delta \theta /2)}{\sin \Delta \theta }}={\frac {v}{\Delta v}}}$
${\displaystyle \Delta v={\frac {v\Delta s}{r}}}$
${\displaystyle {\frac {\Delta v}{\Delta t}}={\frac {v\Delta s}{r\Delta t}}}$
${\displaystyle \lim _{\Delta t\to 0}{\frac {\Delta v}{\Delta t}}=\lim _{\Delta t\to 0}{\frac {v\Delta s}{r\Delta t}}}$
${\displaystyle a={\frac {v^{2}}{r}}}$

Because ${\displaystyle v=r\omega \!}$
We can substitute into ${\displaystyle a={\frac {v^{2}}{r}}}$
to get: ${\displaystyle a={\frac {(r\omega )^{2}}{r}}=r\omega ^{2}}$

Changed:

Magnitude

Assume ${\displaystyle \omega \!}$ is the angle in radians the body covers in unit time - in other words, the angular velocity of the body. Note that the rotational motion being uniform here we may choose any arbitrary unit for time with no change to the value of ${\displaystyle \omega \!}$ - so, without loss of generality, we assume that our unit of time is infinitesimally small.

The velocity vector, being always tangential to the circle, also turns by an angle ${\displaystyle \omega \!}$ in unit time.

The magnitude of instantaneous acceleration, by definition ,is the magnitude of vector change in velocity in an infinitesimally small period of time. The vector representing this is represented in blue in the above diagram. Since our unit of time is infinitesimally small, for all finite velocities, so will be ${\displaystyle \omega \!}$. Hence, the magnitude of the acceleration vector is ${\displaystyle v\omega \!}$.

Thus, we can conclude that the instantaneous acceleration experienced by a body in uniform circular motion is ${\displaystyle v\omega \!}$.

We may substitute ${\displaystyle v=r\omega \!}$ in ${\displaystyle a=v\omega \!}$ to get:
${\displaystyle a={\frac {v^{2}}{r}}}$

Direction

Since the magnitude of velocity never changes, the direction of the acceleration vector can only be perpendicular to the velocity vector. It can be seen from the diagram that this acceleration vector must point to the center of the circle.

Reason for Edit:

The original derivation was unnecessarily complex and leaves the reader with no feel for the underlying physics. I believe this derivation is direct and elegant - and the same time lets the reader see directly why the magnitude is v*v/r.

In Buoyancy

Original:

Pressure increases with depth below the surface of a liquid. Any object with a non-zero vertical depth will see different pressures on its top and bottom, with the pressure on the bottom being higher. This difference in pressure causes the upward buoyancy force.

The hydrostatic pressure at a depth h in a fluid is given by

${\displaystyle P=\rho hg\,}$

where

${\displaystyle \rho \,}$ is the density of the fluid,

${\displaystyle h\,}$ is the depth (negative height), and

${\displaystyle g\,}$ is the standard gravity (${\displaystyle \scriptstyle \approx \,}$ -9.8 N/kg on Earth)

The force due to pressure is simply the pressure times the area. Using a cube as an example, the pressure on the top surface (for example) is thus

${\displaystyle F_{\mathrm {top} }=d^{2}\rho h_{\mathrm {top} }g\,}$

where ${\displaystyle d}$ is the length of the cube's edges. The buoyant force is then the difference between the forces at the top and bottom

${\displaystyle F_{\mathrm {buoyancy} }=d^{2}\rho h_{\mathrm {top} }g-d^{2}\rho h_{\mathrm {bottom} }g\,}$

which reduces to

${\displaystyle F_{\mathrm {buoyancy} }=d^{2}\rho g({h_{\mathrm {top} }}-{h_{\mathrm {bottom} }})\,}$

in the case of a cube, the difference in ${\displaystyle h\,}$ between the top and bottom is ${\displaystyle -d\,}$, so

${\displaystyle F_{\mathrm {buoyancy} }=-d^{3}\rho g\,}$

or

${\displaystyle F_{\mathrm {buoyancy} }=-\rho Vg\,}$

where V is the volume of the cube, ${\displaystyle d^{3}\,}$

The negative magnitude implies that it is in the opposite direction to gravity. It can be demonstrated mathematically that this formula holds true for any submerged shape, not just a cube.

Changed:

The magnitude of buoyant force may be appreciated from the following argument. Consider any volume of liquid of arbitrary shape and volume ${\displaystyle V\,}$. The body of liquid being in equilibrium, the net force the surrounding body of liquid exerts on it must be equal to the weight of that volume of liquid and directed opposite to gravitational force. That is, of magnitude:

${\displaystyle \rho Vg\,}$ , where ${\displaystyle \rho \,}$ is the density of the liquid, ${\displaystyle V\,}$ is the volume of the body of liquid , and ${\displaystyle g\,}$ the standard gravity (${\displaystyle \scriptstyle \approx \,}$ -9.8 N/kg on Earth)

Now, if we replace this volume of liquid by a solid body of the exact same shape, the force the surrounding body of liquid exerts on it must be exactly the same as above. In other words the "buoyant force" on a submerged body is directed in the opposite direction to gravity and is equal in magnitude to : ${\displaystyle \rho Vg\,}$ ( note that here ${\displaystyle V\,}$ is the volume of fluid displaced by the body )

Reason for Edit:

The original derivation was unnecessarily lengthy and leaves the reader with no real understanding of the underlying physics. I believe this derivation is direct and elegant - and the same time lets the reader feel the physics behind it.

Special Relativity and Time Dilation.. a thought

Pertinent Article:Time Dilation

Just a thought.. it would be completely valid to presume as foundational postulate to special relativity that all objects age/move the same in space-time (dt) ^2 +(ds)^2 is exactly the same for all objects observed in a particular inertial frame.. where dt is how much i percieve the body to have "aged".. while ds is how much i percieve the body to have "moved" spatially in that interval. Distance obviously being measured in 'c' units. Needless to say, time dilation results immediately follow from that assumption. A more elegant way of understanding the result i feel than the usual textbook derivation. Lets the reader appreciate that space and time are not two separate entities but things we percieve as seperate - a limitation imposed by human senses. While the concept space-time is what truly makes sense.

time dilation( and other) results follow intuitively.. ( clock (1) at rest vs clock(2) moving at velocity v:

(dt1)^2 = (dt2)^2 +((v*dt1)/c )^2

dt2=dt1*sqrt(1-(v/c)^2)

Dilip rajeev (talk) 22:30, 2 July 2008 (UTC)

Image:Sunrise profile dilip.jpg missing description details

Move of Falun Gong and live organ harvesting

I have reverted your "move" because you did it the wrong way, per copy and paste. To move a page, you must use the "move" function at the top of the page, or else the history of the old page won't be carried over. See WP:MOVE. Also, before moving such a page, please make sure that you have consensus for it, and use correct capitalisation: "Reports of organ harvesting from live Falun Gong practitioners in China" instead of "Reports of Organ Harvesting from Live Falun Gong Practitioners in China". Sandstein (talk) 06:37, 4 May 2008 (UTC)

And please use edit summaries with your edits. Thanks, Sandstein (talk) 06:40, 4 May 2008 (UTC)

Orphaned non-free media (Image:Analysis Tianenmen False Fire GIF.gif)

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Archiving

Hi there I've taken the liberty to be bold and archived your talk page from the history. It is bad practice to blank your talk page when you want to start anew, please see Help:Archiving a talk page for more details on how to archive the next time you want to start anew. --antilived 01:04, 11 May 2008 (UTC)

Thankyou :)

Dilip rajeev (talk) 05:07, 11 May 2008 (UTC)

Tiannamen Sq incident

Kindly do not revert when consensus is overwhelmingly against you, per WP:DE WP:EW and so forth. Blnguyen (bananabucket) 06:58, 13 May 2008 (UTC)

Hello back

You greeted me at my user page, and I want to say hello back. However, I am presently being considered for a one-year ban from wikipedia, and because this could happen any day, I want you to know that I received your greeting and greet you back. You may be interested in the discussion for the Arb committee on the subject of homeopathy that is presently taking place but may finish very shortly at: You may also want to see the Workshop page and the Proposed decision pages too, as well as the Discussion pages for each of these items. I do not mean to "canvass" you. I would send a similar message to anyone who contacted me directly through my user page and who does not seem to be aware of the Arb case at this moment. DanaUllman 00:36, 20 May 2008 (UTC)

CIPFG

If you get some free time, please have a look here, I would appreciate your comments on the CIPFG and Epoch Times, as they relay to the FG series of articles as a whole. MrPrada (talk) 18:15, 6 June 2008 (UTC)

Replaceable fair use Image:1999OrganTransplantRise.jpg

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rfc on bobby

I have notified Bobby fletcher that I will open an RfC on his conduct if he continues. I don't know if this is canvassing, as it's not my intention. Someone else needs to write on his talk page, asking him not to do any more incivility, personal attacks, assumptions of bad faith, etc.. You may wish to do so. diffs:

1. personal attacks, some assuming bad faith: , , ,
2. attempt at "outing", sometimes with personal attacks mixed in: , , -- Please note, these are only a sample. Attempted "outing" goes back months, and Fred Bauder oversighted it. But the user has continued recently.
3. original research: -- Please note, the user has not aggressively reinserted this after it was pointed out

--Asdfg12345 01:27, 26 June 2008 (UTC)

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August 2008

Please stop assuming ownership of articles such as Tiananmen Square self-immolation incident. Doing so may lead to disruptive behavior such as edit wars and is a violation of policy, which may lead to a block from editing. Please stop and discuss all major changes on the talk page first as it is a sensitive topic. antilived 11:41, 6 August 2008 (UTC)

I am only adding well sourced material to the article - especially from danny schechter's reports and reader on the persecution. Kindly review my edits.

Dilip rajeev (talk) 11:53, 6 August 2008 (UTC)

You have completely ignored the NPOV policy and instead presented the article solely from the perspective of FLG. The new intro is not an intro at all, and completely discredits the CCP's side of the story ("five people apparently attempted"? "which claimed the immolators were Falun Gong practitioners"??) while stating the FLG side of the story as fact by including extensive quotations from the FLG press release, creating undue weight (why no quotation from Xinhua?). You have removed the {{NPOV}} tag placed by HappyInGeneral when your edits are disputed by other people in talk page, and have been oblivious to the talk page for 3 days when you did your edits. You have removed valid section of "Beyond the Limits of Forbearance" and in general had gone against the spirit of Misplaced Pages of collaboration and cooperation. The article is in a much poorer shape now thanks to your POV additions and subtractions, and you still continues to ensure ownership of the article by constant edit/revert. Is that not enough evidence? --antilived 06:50, 7 August 2008 (UTC)

You can look at commentary from schechter or ian johnson all of them use the same words. The CCP media is the only source to have claimed the self-immolators were practitioners

Dilip rajeev (talk) 08:14, 7 August 2008 (UTC)

The section beyond the limits of forbearance is still there - its entirety. Merely that anoter user:asdf1234 or somebody had changed its title following my edits

Dilip rajeev (talk) 08:15, 7 August 2008 (UTC)

I am sorry that I had mistaken the removal as I saw it on the diff it had been removed, when it had been moved around. But your addition had created huge undue weight towards Schechter reports, being mentioned 18 times in the whole article, compared to 3 to the version before your string of edits. It does not matter that the source used exactly the same words, in fact the fact that you have quoted the reports puts the article to the POV of the source, which is clearly in violation of NPOV. I have put up a notice on WP:ANI on your recent disruptive edits for being completely oblivious of consensus against the change, and I sincerely suggest you to refrain from any further addition until consensus had been reached on the NPOV nature of the addition and that it does not give undue weight to one sourcee. --antilived 08:26, 7 August 2008 (UTC)

Schechter's work is one of the most comprehensive and an award winning work on the topic. It is not his own analysis, h draws upon a wide variety of sources - from RSF to beijing correspondents of international news agencies. I dont think it is accurate to call my edits "disruptive", I merely attempted, in good faith, to add structure to the article, to bring attention to analysis from schechter, wall street journal's ian johnson and also from other reputable sources.

08:34, 7 August 2008 (UTC)

• I have reviewed this matter, and the ArbCom restriction, and have blocked you for 48 hours so that the edits you have made to the article may be reviewed, discussed and amended as required - in accordance to consensus. At present I am not minded to place you on a topic ban, as I see that you have in the past properly discussed your edits, but should you continue to edit the article without reference to the considerations of other editors it may be an option. I suggest that you return to using dialogue to promote the incorporation of your preferred references. LessHeard vanU (talk) 09:14, 7 August 2008 (UTC)

Please stop. If you continue to delete or edit legitimate talk page comments, as you did at Talk:Reports of organ harvesting from live Falun Gong practitioners in China, you will be blocked for vandalism. I have already warned you on User talk:218.248.68.63. If you continue you WILL be blocked for disruptive editing. antilived 04:21, 15 August 2008 (UTC)

Please see where he comment from the anonymous IP is soured from - directly from a CCP website. RSF calls CCP the worlds biggest propaganda agency. Further, I don't think its a coincidence that such things show up on this page - US Congress, HR organizations all have reported on how the CCP has extended his propaganda campaign outside of china, even to the point of physical assault of practitioners and supporters - even in new york. Dilip rajeev (talk) 05:15, 15 August 2008 (UTC)

And see where most of the FLG article sources came from? Clearwisdom? WOIPFPG? Don't you think it's highly hypocritical and biased for you to say that anything from Mainland China is propaganda? The People's Daily reports Olympics in Beijing, does it mean that it's pure propaganda and that the real Olympics is in Atlantis? Phoenix TV as neutral as you can get in China, and far more neutral than NTDTV from what I have seen, and yet you say it's propaganda? It is AGAINST Misplaced Pages policy to remove other people's comments without a very good reason, and your reason is blatantly insufficient and it's highly pre-judged of you to remove everything that goes against FLG on sight, claiming it's propaganda. I can say the same thing for FLG practitioners spreading their propaganda to the point of assaulting me and my friends as we passed by on our daily business, physically stopping me and shoving me with pamphlets. Such hypocrisy. --antilived 05:25, 15 August 2008 (UTC)

Amnesty notes that all protests by Falun Gong have been entirely peaceful even in china, even during the period when the persecution was the harshest. David Ownby notes" violence of any sort is so alien to falun gong".

Against this most brutal persecution, where practitioners have lost the lives of friends and their closest family, they have protested only in the most peaceful manner - by passing out flyers, sitting in silent meditation outside consulates, etc. Falun Gong's human rights work has been commended on highly by analysts.

Also, kindly see these pages - they are very much worth reading:

• "Sowing Confusion." The article is also about a user, who has been pushing CCP propaganda, on the articles talk page. The last paragraph of the article is particularly interesting.

• Sowing confusion: embarrassed by reports of live organ harvesting, China's sympathizers launch a high-tech disinformation campaign.(CHINA)

How could we allow such, CCP paid and sponsored disinformation campaign pushers to run rampant on these pages? Invariably that is completely against wikipedia policies. That is the main concern I have against such propagandistic edits.

Also note that just above the propagandistic edit on the talk page, we have a user raising concerns where a neutral editor "omvegan" disappeared after posting his email on this talk page. These are matters of extremely serious and genuine concern.

Dilip rajeev (talk) 05:49, 15 August 2008 (UTC)

Ah yes, "Your time is running out" is so peaceful. Hey, who pay and sponsor FLG media outlets like NTDTV and various sites such as clearwisdom, WOIPFG, faluninfo etc.? And yet they are allowed to be used as sources? Your double standards intrigue me, Dilip. --antilived 06:31, 15 August 2008 (UTC)

A note: Falun Gong have top sources vouching for the veracity of their reportage, like David Ownby, Human Rights Watch, Arthur Waldron, David Matas and David Kilgour, and on and on. Their sources have strong external support. The CCP has none of this, and those same sources state clearly that the CCP's information is pure propaganda. So it's not a legitimate comparison. For the purposes of these articles, Falun Gong sources are still primary sources. Primary sources can be used in articles about themselves, and of course there are various rules about how this is to be done. But Falun Gong sources are regarded as legitimate by high quality, independent sources, and they are far more relevant to the Falun Gong articles than thoroughly discredited CCP sources are. Just for an example, this is from David Ownby's recent book. This guy is like the Falun Gong scholar, like the highest quality source on Falun Gong available: "I fully and openly acknowledge that the Chinese government’s campaign against Falun Gong has constituted and continues to constitute a grievous, tragic violation of the human rights of those practitioners who have been arrested, tortured, and killed… I accept as true much of what Falun Gong publications have to say about the brutality of the Chinese state’s campaign against them… These violations have been exposed and condemned by such well-known human rights organizations as Amnesty International and Human Rights Watch, as well as by numerous Falun Gong organizations, whose quite professional publications have been generally accepted as legitimate and trustworthy by these human rights organizations." (emphasis mine) This is in the introduction.--Asdfg12345 08:41, 15 August 2008 (UTC)

Emphasis on "by these human rights organizations". It's debatable whether self-published sources are really good sources on Misplaced Pages, but this is hardly the place to debate about it is it? No one would want to disrupt the talk page of Dilip rajeev for unrelated matter, would they? --antilived 09:06, 15 August 2008 (UTC)

Your recent AIV report

Just letting you know, I've moved your report to Misplaced Pages:Administrators' noticeboard/Incidents#Antilived (moved from AIV). Feel free to continue there. – Luna Santin (talk) 05:58, 16 August 2008 (UTC)

Please be careful what you call vandalism, cause this clearly was not. Cheers, Tiptoety 06:19, 16 August 2008 (UTC)

I had repeatedly pointed out that the source used itself is completely biased and unworthy of inclusion in the article - kindly read the user's response to my comments on the article's talk page. One the surface this may seem like just commntary added from a video, - but the video itself is a pure propaganda piece from the CCP - and that is why I felt the edit was a serious violation of wikipedia policies. The article and related article are on probation by the Arbitration Committe - and addition of such content, despite repeated requests to refrain I feel is clearly disruptive.

I request you to kindly investigate the issue in greater depth.. the matter is not as simple as a commentary from a video being added to the article - where the video is sourced from, it being well documented that the source is engaged in a mssive dis-information propaganda campaign; despite repeatedly being pointed out that the source itself is not something that even remotely conforms to wikipedia standards, the users insistence that the commentary be added to the article - that is what i considered was very much worthy of intervention from an admin.

Dilip rajeev (talk) 06:40, 16 August 2008 (UTC)