Mechanism Definition and 511 Threads

[SOLVED] Reaction Mechanism (Shouldn't Be Too Difficult) Homework Statement Write the equation for the overall reaction and identify any reaction intermediates: STEP 1: Cl2---> Cl + Cl STEP 2: Cl + CO---> COCl STEP 3: COCl + Cl2---> COCl2 + Cl Homework Equations See...

On spontaneous symmetry breaking and Higgs’s mechanism of mass production From lectures: L. Peak and K. Varvell. The Physics of the Standard Model. Full Lagrangian for fermion and photon Combine the gauge-invariant Lagrangian density describing a fermion field in the presence of an...

The Ising model starts with an assumption that the nearby spins reach lower potential by pointing at the same direction. However, two magnets would reach lower potential by pointing at different directions. What is the mechanism, that in the first place makes spins attempt to align themselves in...

Hi there Lately, I have been irritated by some general articles about the Higgs Mechanism in newspapers. Those articles suggest that it gives mass to all particles (vector bosons + all fermions). However, if I read a textbook I can only extract from the context that it gives mass only to the...

I would like to know if it is possible to use the weight of a loaded truck to unload it, and if so by what kind of mechanism. Imagine a truck loaded with a shipping container. A "fork" (as in forklift but without the lift) is inserted in holes between the truck trailer and the container...

[SOLVED] Rotation Mechanics [disk-axle mechanism] Homework Statement Q. A disc is fixed at its center O and rotating with constant angular velocity \omega. There is a rod whose one end is connected at A on the disc and the other end is connected with a ring which can freely move along the...

I'm currently reading this article by Ken Miller on a plausible account of how the blood clotting mechanism in vertebrates might have evolved. There's some things I don't understand but which I hope someone here will explain to me: Here's the article...

I can't convince myself that I understand the mechanism of capillarity- the rise and the drop of liquid level. For conveniene I am just talking about liquids that rises up liquids that form acute contact angle. Now Liquid molecules on the surface (in contact of gas) exert a force on the wall...

I really need help fast. I need to design a mechanism which has to be placed inside a can. The purpose of the mechanism is to knock the can over. I also have to have a 6 seconds delay before the can is to tip. I can use any kind of can thank you

What is Higgs field? Some books say that because of this field the matter has the properties of mass but when I see arxiv I think it's something different. If Higgs particle is a boson then why this Higgs mechanism not considered a force?

I can't convince myself that I understand the mechanism of capillarity. Say the liquid is of that type that rises through a capillary tube. So it's contact angle should be an acute angle. Liquid molecules on the surface (in contact of gas) exert a force on the wall (of capilary tube) due to...

Forgive if I'm being sarcastic, but I just read on the Higgs mechanism, giving mass to the fermions and bosons. But at the same time, Higgs itself has mass? Isn't that abit irony?

Let me take an example. Suppose we have a Lagrangian, of a scalar field coupled to itself and a massless gauge boson field. Next, we expand the Lagrangian about the vacuum expectation value of the scalar field, and it turns out that, in the end, the gauge boson is massive. My question is...

it was found that when isobutylene reacts with Cl_{2} under 0^{o}C in the absence of light it gives more methallyl chloride(3-chloro,2-methyl propene) than the addition product.bubbling oxygen through the reaction mixture doesn't affect the product formation. thsi reaction is carried with...

hey frnds ... i m 1st year student of DCE and m willing to make a car for college competitions. Till now i was using differential mechanism for turning the car but now i m interested to work on steering mechanism .. so can anyone suggest me how to implement steering mechanism ... :smile:

hey i have got to make a scaled model of any mechanism that we see around(or maybe we don't sometimes) in the machine shop in under 3 days as our summer training project. we are provided with all the raw stuff and machines that one usually sees in machining shop. i have decided to make a crank...

Hello all I have attcahed a WORD file that has a diagram that exlains the problem. When you open the file, you would see that I have a inclined part (called ramp) that pivots on a base. A ball (load) rolls up the ramp. The ramp is supported by a spring and some linkage. The linkage shown is...

Homework Statement What is the exact mechanism through which mass converts into energy and vice versa through Einstein's equation.In other words,what are the conditions under which this transformation happens and why?Homework Equations E=m.c^2The Attempt at a Solution Some argue that mass is...

In the presence of polar, non-protic solvents (i.e., DMSO or DMF), alkyl halides undergo reaction with bases to generate alkenes by an E2 mechanism. In the E2 reaction, the proton removed by the base must be anti- to the leaving group, and they must also be periplanar (the hydrogen, the leaving...

I'd like some help from builders - modellers or mechanical tinkerers. I'm trying to build the skeletons of some polyhedra - the vertices are intersections of rods - no faces. http://www.reed.edu/~mcphailb/puzzles/images/hex.bmp" I want to be able to telescope the rods by about 3x. So, I...

I've calculated a straight line mechanism for a 15cm straight line... 39% straightness over the cycle... lengths came out to L1 = 10.35cm L2 = 4.14cm L3 = 13.445 = L4 these values should give a 15cm line... so I went to go build the thing.. all the distances from each hole on...

Homework Statement The reaction: CO + Cl <-> COCl2 has the rate law: rate = k[CO][Cl2]^(3/2) Show that this rate law is consistent with the mechanism: Cl2 <-> 2Cl (fast) Cl + CO <-> COCl (fast) Cl2 + COCl -> COCl2 + Cl (slow) (i don't know how to do superscript and subscript on...

Hey. I've been pondering on and off for a while now how exactly energy is transferred between two gas atoms, with different energies, via collision. Specifically how the electrons, photons, neutrons, protons, and any other particles that are used for energy transfer in convection, interact...

"Meiotic spindle asymmetry and functional differences between the centromeres of homologous chromosomes and recombinant/nonrecombinant chromatids have been shown to result in non-random segregation during meiosis (meiotic drive)". Does anyone know how this works? How would one chromosome be...

Ok so I know with the injection of potassium chloride, the potassium in the extracellular fluid works to inhibit any repolarization, by increasing the amount of K in the extracellular fluid (hence not allowing EPSPs to reach threshold and trigger Na channels for an action potential), however...

Here is a question posed to me recently that I'd like to post for discussion. It has elements of biology and physics. A butter knife does a poor job of cutting through a tomato or your hand, whereas a razor sharp knife cuts through quite easily. Why is this so? What mechanism is at work at...

can anybody help me to find the answer of this question? a fan ( or a propellor) rotates sidewise, but the air goes making a perpendicular with the axis of its motion.. I know that there is vector involved in this, but how does it work?

It's obviously been a while since I've worked some of these problems, and I thought I got it, but then something is tripping me up on each of these: 1) Rocket is fired vertically and tracked by radar--obtain an expression that relates the altitude and the horizontal distance between it and...

I read an interesting article in the national geographic which stated that a possible mechanism for diversification in evolution might be inside organisms themselves. The article stated that there was an anomoly in the diversity of a selectly breeded chicken population. With the selective...

Stefan Rosswog has some ideas about what causes GRB (gammaray bursts) He and Daniel Price have a recent article in Science journal about it, and they have some stunning movies of two neutronstars spiraling into merge. I could not find the Science article---the most recent Rosswog---online. It...

I know that this one can't be a. or c. which is true but, i think its either b. or d., does a catalyst change the mechanism of a chemical reaction ? Which statement is not correct regarding the function of a catalyst? a. A catalyst lowers the activation energy. b. A catalyst changes...

Are there any sort of essays or generally accepted criteria for accepting one theory over another? I ask, becuase for most any theory, it seems that you can find evidence for it. If you did your research, you could come up with tons of evidence for a totally wrong theory (like all the evidence...

A 2000kg elevator rises from rest in the basemtn to the fourth floor, a distance of 25m. As it passes the fourth floor, its speed is 3.0 m/s. There is a constant frictional force of 500N. Calculate the work done by the lifting mechanism. I tried doing v2square = v1square + 2ad and i get 0.18...

Who can tell me the microscopic mechanism of electric polarition of amorphous,such as Si3N4 or SiO2.Which dominates the permittivity of amouphors,is it Eletronic polarization,orientational polarization,Atomic ploraization or something others?thank you.

Who can tell me the theory about the LCR bridge to measure capacitance?

Hi guys... Can anyone hlp me with the mechanism of a cylinder rolling down a ramp? Here's my understanding about the problem. Can anybody corrected me? If the CM is located at point O (the center of the cylinder), then the torque of for the rotational mechanism is provided by the friction force...

Chlorination mechanism... In chlorination, with chlroine gas and methane, why does the UV light cause the chlorine atom to split into free radicals? I know that it "supply the energy", but what actually happens? Thanks. :wink:

IGF-1 has been shown to increase regeneration of nerve cells. I have seen the studies, but am unable to find the actual mechanisms. Does anybody have any information on this or know where I could find it. I have look through my cell and molecular biology book, but can not seem to find it...

Hello, I think the one I drew and included in the attachment is valid for Michael-type addition reactions. Do you make a favor to check the mechanism? I think, the steric hindrance of the more-stable carbocation in vinyl group can not participate in this type of mechanism, it is further...

Methylbenzoate reacted with excess phenylmagnesium bromide, forms the salt of triphenylmethanol. I need help figuring out this mechanism.

I once read a 1997 physics book. At the end of the 'static electricity' chapter, it explains the mechanism of DNA replication and protein synthesis (in which static electrical force plays a critical role). However, it says something like 'this model has not been seen in action. It is consistent...

Electronics World, October 2004, Vol. 110, No. 1822: Page 55 summary of gravity as per http://nigelcook0.tripod.com/ The outward motion of matter in the big bang causes an opposite motion of the fabric of the continuum of space, flowing around fundamental particles to fill in the vacated...

Just recently Hawking rejected baby universes; the mechanism was that black holes would spawn a new dimension unseen from our universe. Smolin first proposed this idea, and as far as I can tell in recent discussions between Susskind and Smolin he still believes in it. Susskind had argued...

Do we actually know exactly how the Casimir force is produced, or is this still something to be researched? I know the plates block out some of the vacuum flactuations modes, so the "pressure" outside the plates is more than the "pressure" inside the plates. But how does this "pressure" form? Is...

A Rule of Thumb: "Higher Electronegativity seeks bonding with Lower Electronegativity" Before completing my PhD in organic chemistry, with a minor in inorganic, some 20 yrs ago, I realized that the main mechanism for most organic reactions and most inorganic reactions was one of negative...

Can you tell me what the mechanism of da command "NETSTAT -A" is ? and in the state column, i have seen Last-ack, Fin-wait-1, syn-send What are they, and how are they created sytematically in actuallity ? Would you please give me examples to prove anything you say too ? Being without any...

Are there any other mechanisms apart from Higgs mechanism that explains the spontaneous symmetry breaking making photon massless and W and Z bosons massive? Do you really believe in the Higgs mechanism?

Proof that gravity constant G = (3/4)(H^2)/[(pi)(density)e^3] The acceleration of matter outwards in the big bang is a force (Newton's 2nd law) requiring a reaction (Newton's 3rd law). The reaction is the inward directed force of gravity carried by the fabric of space. Proof of 1.7%...

i know very little quantum mechanics and would appreciate as qualitative a reply as anyone can muster... what is the physical mechanism for decoherence? decoherence sounds like a solution to quantum 'weirdness' if i understand it correctly...you have to take into account a myriad quantum...

The mechanism of falling object is always an interested topic. Almost all physicists think that gravitational force acts on object and makes it have weight and free fall. Here a very simple experiment negates the above parlance. Galileo demonstrates that different mass bodies increased their...