Formulas Definition and 545 Threads

Formulas for acoustical dampening? Hello, A number of years back I worked at an engineering company where we needed to isolate very large, very loud motors from transmitting sound energy into the supporting structure. We did this with a series of elastic isolators that supported the motors...

Hi! How can i write chemistry formulas in LaTeX ? Such as: MgC_12 etc... It does not look good if it is done in math-environment...:rolleyes:

Name the following :ZnI2, BrF, FeSO3, CaH2, BaHPO3,CuNO3, AgIO, SO2 write the correct formula of these: zinc sulphate, barium nitrate, gold(III)nitrate, barium chloride, mercurous nitrate, antimony(V)cloride, ferrous bromide, calcium carbonate and hydrobromic acid. i have attempted them...

Is there a kosher way of manipulating formulas containing floor truncation, say, \sum_{i=1}^n \left [ ~ { 333 \over 2^i } ~ \right ] ~=~ ? (I mean analytically, not writing a computer program to find out the result.) Thanks.

Given: Draw structural formulas for all the alcohols that have the molecular formula C5H11OH. Name each one and classify them as primary, secondary, or tertiary alcohols. Describe how they are formed and give two uses for this type of alcohol. Solution: I am still at the naming portion but...

What is the difference between formulas E=p^2/2m and E= hf ?

Hi, does it exist a program where you can write in mathematical formulas, draw geometrical figures and create graphs and functions easily?

Hi all Looking for simple formulas to describe maximum acceleration of steel tubes when tubes are compressed and suddenly released when submerged in water (dont know if the water does anything else than supply buoyancy). Please, also feel free to comment freely on the topic and formulas...

Help! How do i rearrange this equation to make x the subject? y=xsquared

The Problem; Given H = U + PV and dU = TdS - PdV Find dH in terms of T, S, P, V My Solution; H = U + PV dH = dU + PdV + VdP dH = (TdS - PdV) + PdV + VdP dH = Tds + VdP My Question Am I missing a step between the first and second steps? I'm taking the derivative of both sides...

Sorry to bother you all with a trivial question. I'm a Belgian teacher and I'm struggling because I don't know how to read a formula in English. How do you pronounce the apostrophe in for example v'. In French we say 'prime'Can anyone help?

It's a previous exam question using compound angle forumlas. I've tried everything to try and get the answer involving rearrangments! I know the forumlas i just can't get them to work to show this. I assume its something to do with adding or subtracting the forumla away from each other...

I was bored so I make fun with derivations of SI units of many Physics formulas. Note, this should just be called "introductory physics", that means NO calculus (but rate of change designated by the delta symbol) and motion is in one or two directions only. This is high school physics level in...

I am a 2nd year student at an engineering school. I searched google and other sources to try to find anything and everything on electrical engineering. I found only a few good sites, though. So I was wondering if anyone could please give me a useful site or two. : ) Of course I am looking for...

I recently made several comments about the sole use of formulas when a logical approach would be as effective. https://www.physicsforums.com/showthread.php?t=150999 I am a high school senior taking AP physics C. Last year I took a more basic course, and in both of these classes (more so...

How do you rearrange a formula to isolate a particlur variable.

Homework Statement What is the likely formula for CH3NH? Homework Equations We need to find the value of ? in order to have 8 valence electrons on the outer shell of the compound. The Attempt at a Solution I could do less "complex" ones, such as GeCl? Ge has 4 valence elctrons...

One of my homework questions asks to give the formula for the compound mercuric carbide. I'm pretty sure that the symbol for mercuric is Hg^2 and the symbol for carbide is C_{2}, so does this make the formula Hg^2C_{2}?? Or is it more complicated than that?

Hey, Does anyone know a good program (similar to word) that can be used to write mathematical formulas? It kind of sucks to write them in word as it is very limited. Lol preferably a freeware.

Can you tell me the 3 basic formulas? I forgot them. The ones with V= Vi-Vf= D=

Today I was watching my sister do her Financial homework and I tryed to do one of them problems it said something about haveing 5000 bucks at 9% interest for 6 years and you had to find how much you would have. And so I tryed to use the compound interest formula P=A(1+(r/n)^rt but we both got...

We lit a piece of Mg so the formula is: 2Mg(s) + O2(g) HEAT-- 2MgO(s) We then dissolved this in water so it would then be: MgO(s) + H2O(l) -- Mg(OH)2(l) Next we blew into water which is: CO2(g) + H2O(l) -- H2CO3(l) Is this all correct? Should I have (Aq) after the H2CO3?

On my homework, I was given the equation V=1/3 x pi x r squared x h. I need to rewrite the formula so that it is solved for h. Any help will be greatly appreciated!

I am working on a project that requires the changing of the radius of a pipe then finding the pressure of this pipe. There are two chambers C1 and C2 the liquide with x density is pumped into C2 using a piston pump. The liqude in C2 drains back to C1 at a constant rate of a. The radius of the...

I haven't had precalc 2 yet, so I'm not too familiar with sin, cos, tan, but I need this for my physics class. So if you guys don't mind giving me the formulas of sin, cos, and tan.. for example: Sin angle A = width/length etc. If I have a right triangle with a hypotonuse of 7, and an angle...

Does anyone know the formulas for (1) linear momentum (2) angular momentum for the situtation of two spacecraft s colliding in space or in orbit thankz

Hi Everyone, I read the Tesla patent about bifilar pancake coils here: http://www.magnetricity.com/NeoG/Bifilar.php and I read about how they are supposed to decrease the impedance and increase the capacitance of the coil. So I constructed one to try out the idea. To my surprise, when I...

Hey guys,i need a little help. I am looking for webpages with the max moment formulas and distances (if possible) of beams (cantilever, 2 support, 3 support, double embedded,etc...)

is it possible to store formulas in a calculator, i have a sharp el-531w thank you

I'm writing a paper which includes a treatment of the gamma function, and I am taking suggestions for non-elementary formulae involving the gamma function. I have the usual limit of a product definition, two infinite products, the usual improper integrals for Re[z]>0, the Guass multiplication...

Hello..my question is from wilson theorem: (p-1)!=-1mod(p) how could you derive the formulae for pi(x) ?..this should be impossible as you can,t solve the congruence exactly a proposed method would be to find the roots of: f(x)=[\gamma(x)+1/x]-(\gamma(x)+1)/x that precisely x=p...

I'm reading Advanced Calculus by Wilfred Kaplan 1952. He is demonstrating how to find the decomposition of the acceleration vector into its normal and tangential components. I'm following along until he replaces the magnitude of the derivative of the angle with respect to the distance traveled...

I am working on a problem in which there are 100 widgets. I need to find how many samples of size 5 there are, which I found to be 75,287,520. No problem there. I am not sure how to go about the next part, however. In the original set of 100 widgets, 3 are broken. How many of the samples of...

I have often noticed something between distance formula: d(P_1,P_2)=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2} and equation of a circle: (x-h)^2+(y-k)^2=r^2 There appears to be a relation between the two. It seems as though both h,k can be replaced with an x,y (in the eqaution of a circle...

What are some good study habits to pick up in order to remember formulas and even better yet, how to apply them in the right situation.

Well, I am having trouble doing a big project that's due this monday. I can't get any of my formulas to work, and I so I used logic on a motion problem. Here's my made up problem that I have to graph in Excel: An object travels at 39m/s for 4 seconds and then slows down at a rate of -6m/s² for...

I have just found a new website featuring maths formulas, physics formulas, chemistry formulas. The site is [PLAIN]www.eformulae.com[/URL]. A must Visit site o:)

Does someone know of a good plugin to Messenger allowing for easy math typesetting? For example a plugin which allowed the use of LaTeX codes? Writing math in messenger is certainly a pain, especially because of the smileys (they can be turned off, I know, but anyway : - ). An easy way to write...

In the Vol. I, 27-7 of Feynman's Lectures on Physics, he derives a formula for the resolving power of an optical system from the general rule t2 - t1 > 1/nu (nu is frequency) as D > lambda/n*sin(teta). It appears, however, from the corresponding Fig. in the book that the latter inequality...

How to proove those formulas for any angle? So far all the proofs I've found are for angles between 0 and 2pi...

ok, so my problem goes like this: I have that the integral of dx/((cx+a)(dx+b))=1/(ad-bc)lnabs((dx+b)/cx+a)) + C I have to use differentiation to verify the integration formulas. So far I've gotten to: D(1/(ad-bc)lnabs((dx+b)/cx+a)))=(1/ad-bc)((cx=a)/(dx+b)) => (cx+a)/((ad-bc)(dx+b))...

I know basic formulas / symbols in LaTeX, but I'm not too good with the whole PDF thing. I mean, once I have a .tex file I can make a PS, DVI, or PDF file no problem, but the .tex file is the hard part. Every tutorial I read is like 100 pages long. Does anyone have a brief tutorial that gives...

In the same way that it is possible to derive most trigonometric identities from the addition formulas, what is the way that the difference of sines and cosines formulas were derived, such as \sin{a}-\sin{b}=2\cos{\frac{a+b}{2}}\sin{\frac{a-b}{2}} thanks, I am trying to avoid as much...

[SOLVED] How to deduce rot and div formulas under spherical or cylinderical coordinat It is said that in general, these formulas are: if dl_1=h_1du_1, dl_2=h_2du_2, dl_3=h_3du_3 then \nabla \Psi=\frac{1}{h_1}\frac{\partial\Psi}{\partial u_1}\vec{e}_1 +...

While working through a problem I arrived at a stage where a vector, say V being parallel to the plane I'm trying to find the formula for. Taking the normal vector of the plane to be n I used the dot product: n*V=0 in this case I knew V to be <-2, -2, -1> and n I set to <a,b,c>. This leads...

Calc Formulas ~Help~ I am looking for an organized list of calc formulas, can anyone help me out? ``~CutiePieNumberJunKie~``

Dear Experts. Do you know some literature on representation of rational numbers by formulas? TIA.

I was just wondering, can you name of the books, which they are kind of basic, and explains all the formula's. Just name the books that's all.

Last Question.. I promise! a)Using structural formula show the reactions between: i) HBr and 2-propene ii) 1-butanol and 1-propanoic acid. b) How many isomers are possible in (i) c) Name the type of reacion in (i), In (ii) d) To what family does the organic product in (ii) belong? K...

In the time lorenz formulas, how can u tell what the difference between t-zero and T is? t-zero T= -------------------- ------------------- | 1 - (v^2/c^2) \| for example in the following...