Physics Forums

Physics Forums - Blogs http://www.physicsforums.com/blog.php Scientific physics forums for professionals and students to discuss serious issues and topics regarding physics in theory, practice, study and reality. Students can also find help for homework and career perspectives en Sun, 08 Nov 2009 01:13:55 GMT vBulletin 60 http://www.physicsforums.com/Nexus/misc/rss.jpg Physics Forums - Blogs http://www.physicsforums.com/blog.php test... http://www.physicsforums.com/blog.php?b=1448 Sat, 07 Nov 2009 20:55:21 GMT $LaTeX Code: I = I_{com} + Mh^2$ ]]> testing this out..

$LaTeX Code: I = I_{com} + Mh^2$ ]]> farleyknight http://www.physicsforums.com/blog.php?b=1448 Please post questions in the forums, not the blogs. http://www.physicsforums.com/blog.php?b=1446 Sat, 07 Nov 2009 14:13:56 GMT Questions are best asked by posting in the forums, not the blogs. Redbelly98 Physics Forums Mentor Questions are best asked by posting in the forums, not the blogs.

Redbelly98
Physics Forums Mentor ]]> curiousdude18 http://www.physicsforums.com/blog.php?b=1446 First-order differential equations. http://www.physicsforums.com/blog.php?b=1444 Fri, 06 Nov 2009 14:13:47 GMT Computer has just wiped this post!:grumpy: I have finished this unit, it basically consisted of; A revision of the basic differentiation I have previously studied. Brief look at the logistic... Computer has just wiped this post!:grumpy:
I have finished this unit, it basically consisted of;

A revision of the basic differentiation I have previously studied.

Brief look at the logistic equation and a very basic population.

General and particular solutions.

Initial value problems.

Errors.

Direction fields(need mathcad to fully complete this).

Euler's method.

Direct integration.

Separation of variables.

Linear first-order differential equations and the integrating factor method.

No major problems or confusions so far. Next unit is second-order differential equations. ]]> lincs-b http://www.physicsforums.com/blog.php?b=1444 Good intentions. http://www.physicsforums.com/blog.php?b=1443 Fri, 06 Nov 2009 12:01:30 GMT Well I was going to start up a blog elsewhere but seeing as I lurk on the site nearly daily I may as well post on here. I am an Open University Student and about to start year 3. Every year I... Well I was going to start up a blog elsewhere but seeing as I lurk on the site nearly daily I may as well post on here.

I am an Open University Student and about to start year 3. Every year I have such good intentions but by the end I am always getting behind. I'm hoping that by starting this blog I will not only have a record of how badly I have done but maybe a few people may encourage me.

So at the end of January I will be starting MST209 (mathematical methods and models), S382 (astrophysics) and SMT359 (electromagnetism). I'm not working but do have two kids so you could probably say I am naive or stupid as I will need to be putting in 40+ hours a week.

Until the end of January I will be getting ahead with the topics covered next year. Some of the units are available for free on the OU website so I will be hoping to complete most if not all of these. I have also bought Calculus vol 1 by T.M.Apostol so I shall be trying to fit this in somewhere.

I'm thinking I should look for some textbooks related to the astrophysics and electromagnetism courses but don't know if I can afford this before Christmas. Any recommendations to go on my Christmas list would be appreciated. ]]> lincs-b http://www.physicsforums.com/blog.php?b=1443 Please post questions in the forums, not the blogs. http://www.physicsforums.com/blog.php?b=1442 Thu, 05 Nov 2009 11:26:57 GMT Questions are best asked by posting in the forums, not the blogs. Redbelly98 Physics Forums Mentor Questions are best asked by posting in the forums, not the blogs.

Redbelly98
Physics Forums Mentor ]]> krcp http://www.physicsforums.com/blog.php?b=1442 interview with an civil engineer http://www.physicsforums.com/blog.php?b=1440 Wed, 04 Nov 2009 17:34:48 GMT i am a grade 10 student atr resurrection C.S.S and for a career project it was required to get an interview with someone in the career that i was persuing ......... 1. name and university... i am a grade 10 student atr resurrection C.S.S and for a career project it was required to get an interview with someone in the career that i was persuing .........

1. name and university graduated at ?
2. how many years in school?
3. dislikes of job and likes ?
4. what got you interested in this career?
5. whats a regular day to you ?
6. what would you consider to be a good day ?
7. how much do you earn?
8. whats the possibility to get a job these days in this field ?
9.what are somr skills you need to be succesfull in this career?
10. do you remcommend this career?

thank you for you time ]]> paola.ram http://www.physicsforums.com/blog.php?b=1440 Please post homework questions in the forums, not the blogs. http://www.physicsforums.com/blog.php?b=1439 Wed, 04 Nov 2009 00:16:46 GMT Questions are best asked by posting in the forums, not the blogs. Redbelly98 Physics Forums Mentor Questions are best asked by posting in the forums, not the blogs.

Redbelly98
Physics Forums Mentor ]]> CristiBell http://www.physicsforums.com/blog.php?b=1439 hey there anyhelp on where to go would be nice http://www.physicsforums.com/blog.php?b=1438 Tue, 03 Nov 2009 21:18:48 GMT hi there im 15 and i feel let down by me teacher i am advancing further than the class and am very interested in learning higher education would anyone be willing to help me? hi there im 15 and i feel let down by me teacher i am advancing further than the class and am very interested in learning higher education would anyone be willing to help me? ]]> chris01292 http://www.physicsforums.com/blog.php?b=1438 Notes http://www.physicsforums.com/blog.php?b=1434 Sun, 01 Nov 2009 12:01:34 GMT "Concern for man himself and his fate must always form the chief interest of all technical endeavor; never forget this in the midst of your diagrams and equations." Albert Einstein ]]> infsup http://www.physicsforums.com/blog.php?b=1434 Quantum Mechanics is Easy http://www.physicsforums.com/blog.php?b=1432 Sat, 31 Oct 2009 19:22:22 GMT Quantum mechanics is the most accurate description of the universe available to the mankind. According to popular belief quantum mechanics is vary hard and very advanced and very abstract... Quantum mechanics is the most accurate description of the universe available to the mankind.

According to popular belief quantum mechanics is vary hard and very advanced and very abstract subject.

But in reality its easy and interesting subject.

In quantum mechanics things are small,lightweight,simple,linear.

If you are good with basic math and algebra. And you learn little linear algebra (eigenvalues,eigenvectors,matrices,vector spaces etc.) and some basics differential equations YOU CAN UNDERSTAND QUANTUM MECHANICS.

So what is so difficult about it and what gives rise to the popular beliefs and mysteries?

Real tough job in quantum mechanics is its interpretation (correct one ;-)) which is still an open question. ]]> david.makcenz http://www.physicsforums.com/blog.php?b=1432 Interview with an engineer! http://www.physicsforums.com/blog.php?b=1426 Wed, 28 Oct 2009 20:42:56 GMT Hi, I have been looking for an engineer to interview for about a week now and have not found anybody willing to sit down and interview with me. Can somebody please fill out this interview for me? ... Hi, I have been looking for an engineer to interview for about a week now and have not found anybody willing to sit down and interview with me. Can somebody please fill out this interview for me?

1. Engineers name:
2. Universuty(s):
3. Year(s) graduated: Degree(s):
4. Type if engineering:
5. Liscensed Professional Engineer? (yes/no):
If yes where?
6. List any graduate studies/degrees/schools:
7. Present place of employment:
a. Job title:
b. Job description:
c. How long were you employed there?
d. what does a typical day of work consist of, i.e. hours worked, meetings, designing, testing, supervising, etc.?
e.What is the best liked feature of your job?
f. What is the least liked feature of your job?
8. Last previous place of employment:
a. Job title:
b. Job description:
c. How long were you employed there?
9. Looking back at your engineering college days, what improvements would you recommend that the college incorporate into its academic program?
10. What part of your engineering education has been most useful to your work?
11. What part if your engineering education has been least useful to your work?
12. Looking back, what would you do differently if you were just starting your engineering schooling over again?
13. What advice would you give to an engineering student? ]]> kevin0788 http://www.physicsforums.com/blog.php?b=1426 Koide doublets? http://www.physicsforums.com/blog.php?b=1412 Tue, 20 Oct 2009 09:30:10 GMT From a point of view, there are no Koide doublets. If we define Koide's relationship as coming from three matrix conditions:

$LaTeX Code: M^{1/2}= A + B$ with
1) A multiple of the identity
2) B traceless
3)

Then the 3 in the 3/2 factor is really the dimension of the matrix, and thus the factor is 2/2 for Koide's doublets and 1/2 for Koide "singlets". So in this sense there are no Koide doublets.

If we consider that Koide's is about "45 degrees off from (1,1,1)" the result is the same: the 3 comes from the number of components of (1,1,1). Visually, it is trivial, that 45 degrees off from (1,1) one of the components is going to dissapear.

So the only extand posibility is to consider that a doublet is a triplet with a massless component. If we do the scan in this way, we find two interesting doublets, one composed by eta' and upsilon, and other composed by pion and D. Also, the kaon seem able to contribute to some doublet or triplet, but there are no a good match. Same in the barions, with Lambdas. And that is all: no more matches.

Incidentally, I wonder if there are alternatives to conditions 1,2 above. For instance [A,B]=0, or Tr ((A+B)^2)=Tr(A^2)+Tr(B^2). I am afraid that these alternatives do not fix A beyond being diagonal. ]]> arivero http://www.physicsforums.com/blog.php?b=1412 haikus http://www.physicsforums.com/blog.php?b=1411 Tue, 20 Oct 2009 05:21:13 GMT I was just reminiscing about an old PF haiku thread:
http://www.physicsforums.com/showthread.php?t=82223

I submitted a creepy haiku:

midnight now, can't sleep
make-up smeared eyes glint at me.
clown at my window.

and Zooby came back with such a great response:

Greasepaint prints on glass,
red sponge nose pressed flat on glass?
Baseball bat should work.

Had me in stitches. :) ]]> Math Is Hard http://www.physicsforums.com/blog.php?b=1411 I am still surprised at the attitude of some students http://www.physicsforums.com/blog.php?b=1405 Sat, 17 Oct 2009 05:20:31 GMT Math class has been progressing much as expected. The basic properties, Commutative, associative, and distributive as well as the identity elements have been presented. I am actually surprised at the... Math class has been progressing much as expected. The basic properties, Commutative, associative, and distributive as well as the identity elements have been presented. I am actually surprised at the level of rigor with which the material is presented. The teacher defined the absolute value as the distance from zero. Which is my mind is a super definition.

There is girl in the math class who just makes me shake my head. She just does not seem to care, never makes any effort to do work in class or even listen to the teacher. She just talks to the boys sitting around her. Today when called upon to factor 30, she replied,

" Oh, I can't do that. I don't now the multiplication table." ]]> Integral http://www.physicsforums.com/blog.php?b=1405 Fine Structure Constant via Geometry? http://www.physicsforums.com/blog.php?b=1404 Fri, 16 Oct 2009 15:03:29 GMT Re: Panpsychism and Thermodynamics, Explored

(Submission to the book, Philosophy and Evolution )

Note added in proof:
As a work in progress introducing it's present status, emphasis is on dimensional units; kg, m, and sec, But kg/ sec as growth and kg/sec2 as stimulation are not usual in Physics. Mass and time are ubiquitous. Biophysics will require "something missed"!

Rigden's book on Hydrogen21 lists six experimental measurements that identify a dimensionless fine structure constant, a, as 0.00729735308, with no theory or model to calculate it. He quotes Purcell's "With respect to a we are in the rather humiliating position of people who have to wrap a string around a cylinder to determine p." Geometrical considerations22 show surface-to-volume (S/V) as (S3 /V2) to be dimensionless, which for a sphere is 113 and for a regular tetrahedron is 374. At least four collinear points are required to define the "space" occupied by mass, therefore in Euclidean geometry the sphere and the regular tetrahedron represent the least-to-most surface activity per unit volume (ignoring the more complicated irregular tetrahedron). The fact that the ratio (113/374), equal to 0.302, when raised to the 4th power gives 0.00802 (of same order as a ) seems more than coincidental.

Pursuing this idea, a simple experiment using a constant chosen clay volume of 43.8 cm3 was performed. Molded as a sphere, (S/V)Sp , and as ~oblate by pressing to a flat disc (S/V)Ob , and ~prolate by rolling into a long rod, (S/V)Pr spheroids it resulted in more than 2 orders of magnitude between spherical and prolate shapes. Further, the ratio of minor to major axiis of the spheroidal approximations was 0.29, raised to the 4th power was 0.0071, again near a.

Returning to the subject of Panpsychism and Thermodynamics, a simple hierarchy of mass is.. particles-atoms-molecules-smallclusters-bigclusters. Without charge or photons in the mix at the atomic level, protons and electrons involve mass ratios of ~2000. Energy-volume ratio, E/V, is pressure, P, while energy-mass ratio, E/M, is c2. These, as a ratio, produce density, r, such that P=r c2. Imposing a liquid-vapor model23 requires equilibrium of pressures, such that nucleus to electron densities are of order 1016 to 1 A proton of ~2000 electron masses might be initially held together by gravity at the critical radius of Eq. ( I ). There would be tremendous pressure and energy potential to eject 1/2000th of it's mass. Are the proton and electron within the hydrogen atom always the same ones or do they resonate? In reference to an electron's mass and charge in the absence of measured mass and charge, Rigden21 (p. 168) asks, "In the words of the trade, what are the base mass and base charge?"

Being independent of time, light has freedom, while mass has a time dependent security. The need of mass for more time is panpsychism and involves light. Photons, electrons, and their interactions with mass are better left to a subsequent article. For those wishing clarification, more detail, or wish to comment on aspects of this approach, you may e-mail the author at sdog1@sbcglobal.net. ]]> SdogV http://www.physicsforums.com/blog.php?b=1404