Solid Definition and 1000 Threads

I'm having some trouble understanding heterogenous equilibria. I read that solids, pure liquids and solvents are omitted from the equilibrium expression. Let's say I have some AgCl in a litre of water. The tiny amount of AgCl that dissociates and dissolved is given by its Ksp. I understand that...

Homework Statement On crystal which containing ions V^{4+}, electronic configuration 3d^1, was applied magnetic field B_0=2,5T. If the temperature is 1K, find the relative concentration of electron states population \frac{N_2}{N_1}. In what temperature we should expect 99% ions in ground...

1. Use polar coordinates to find the volume of the given solid. 2. Inside the sphere x^2 + y^2 + z^2 = 16 and outside the cylinder x^2 + y^2 = 4.

a silicon crystal is doped with 10^15 cm^-3 atoms of antimony and its also doped with 10^16 cm^-3 atoms of boron will the crystal be type p or type n what will be the concentration of minory charge carriers and majority charge carriers ? Boron has 3 electrons in outer circle and...

Using polar coordinates to find the volume of a bounded solid[Solved] I found the equation of the boundary circle by setting z to 4 in the paraboloid. Then I did some work to get polar coords: x^2+y^2 = 1 x^2+y^2 = r^2 1-x^2-y^2 = 1-r^2 Then I set up my integral as such...

Hello guys, I checked coagulation but I can't find the explanation of how blood (serum) suddenly turn into solid? How does this occur? Thank you! :smile:

"we want to calculate the heat enrgy of a gas molecule n - is the number of molecules per volume v_th - is the average speed of gas molecule L - is the distance which travels one molecule in a certain time we have six directions for which they travel +-x +-y +-z so in each time n/6 of...

For indistinguishable particles we use fermi-dirac(FD) or bose-einstein(BE), and for distinguishable we use maxwell-boltzmann(MB).For the distinguishable case our prof gave us the example of atoms in solid, because the positions of the atoms are fixed, so they are distinguishable, thus satisfy...

I have a volume problem that I has been bothering me for a while now, as I have just not been able to figure it out. The question involves finding the volume of the solid generated by revolving the region bounded by y = x, y = 0, and y = 4 around the line x = 6. I tried doing \int ^{4}_{0}16...

Volume of a solid limited by these two paraboloids z=2x^2{}+y^2{} and z=12-x^2{}-2y^2{} hi can someone help me? I tried to solve this and my solution was \ 24\Pi is it correct? can someone solve this step by step?

Homework Statement An electron and a proton are each accelerated through a potential difference of 10MV. find the momentum in MeV/c and the kinetic energy in MeV of each using relativistic formulae and compare with the results of using the classical formulae. Are the particles moving at...

Homework Statement A 0.5-kg rubber ball is dropped from rest a height of 19.6 m above the surface of the Earth. It strikes the sidewalk below and rebounds up to a maximum height of 4.9 m. What is the magnitude of the impulse due to the collision with the sidewalk? Homework Equations...

Homework Statement A charge q is uniformly distributed over the volume of a solid sphere of radius R. A spherical cavity is cut out of this solid sphere, and the material and its charges are discarded. Show that the electric field in the cavity will then be uniform, of magnitude...

Homework Statement It is just a conceptual question. I learned that all charges tend to move toward outer surface, meaning all the charges of the solid sphere will be on the surface of the solid sphere. Then, why is it that the electric field increases linearly with distance? shouldn't it...

Homework Statement A hole is drilled through the center of a ball of radius r, leaving a solid with a hollow cylindrical core of height h. Show that the volume of this solid is independent of the radius of the ball. Homework Equations V = \int_{a}^{b} 2\pi x (f(x) - g(x))...

I recently completed a degree in Computer Engineering and am looking to pursue a Masters and eventually a PhD in Electrical Engineering; specifically in solid state devices. One of my concerns is the potential lack of knowledge in mathematics I may have. As a Computer Engineering undergrad I...

I've seen this exact question in a book. (This is not homework) I've always thought this is because work has nothing to do with effort, but seeing this question on a book quite shocked me actually, is there any deeper explanation?

Homework Statement Homework Equations integral [a, b] 2*pi*x*sqrt(1 + (dy/dx)^2) The Attempt at a Solution Well I know how to do surface area questions... But that the @#$@ is with this random equation? How would I even start to evaluate it... Like honestly... I don't even understand the...

Hey, i know this is the science section but it's a brief question. Actually, the title contains it all =p I'm looking for a good pre-calculus book to brush up on stuff this summer.

Hi, In a cantilever beam with a load on the free end, at a point on the neutral axis, will the normal stresses (due to bending stress and axial stress) be zero? Or am i wrong? And if i was to draw a Mohr circle for that point at the neutral axis, would the center of the circle be the origin? I...

Homework Statement The radius characteristic of the volume occupied by each electron rs is required that rs>>((h^2)/(2m*kB*T))^(1/2). What is the significance of the length rs must exceed?

Hi, if the shear stress on an element in a solid is SAy/bI, where S is the shear force and y is the distance from the neutral axis, what value of y do i use if the point I'm calculating is on the neutral axis?

Homework Statement Find the volume of the solid that results when the region bounded by the curves y=16-x^{2} and y=16-4x is revolved around x=8. If you could show me how to do it with both the shell method and washer method it would be greatly appreciated. Homework Equations...

Let' say two steel or rubber disks hit each other moving on friction-free surface. During the interaction, both disks deform elastically. My question is, does part of deforming energy gets converted to heat ? Why not ? Why this effect is never mentioned ? Is it negligible ? I know from...

What is lithium gas? Lithium is a solid metal (At room temp). Is lithium gas super heated Lithium in gasious form? or is there a process other than heating that produces Lithium in gas form? Is there a chemical way of converting Lithum to gas form? Thanks Jim

Homework Statement I need to find the region bounded by these curves then find the volume of the solid generated by revolving this region about the x-axis. y= cscx, x= 1/4pi, x = 3/4pi, y=0 Homework Equations The Attempt at a Solution So I managed to sketch this region.. but I have trouble...

Does anybody else love science fiction? Does it involve bipedal machines? Did you really like all of the Metal Gear Solid games? I ditto all of the above! But one question strikes me (besides asking myself if Hal Emerich scientific lingo actually makes sense) how will we power these...

Homework Statement If the following substances were heated what gas would be given off and what solid would remain? strontium carbonate, zinc carbonate, and iron carbonate. Homework Equations N/A The Attempt at a Solution So I presume carbon dioxide would be given off and the 3...

Homework Statement In the Drude model the probability of an electron having a collision in an infinitesimal time interval dt is given by dt/\tau. (a) Show that an electron picked at random at a given moment will have no collisions during the next t seconds with probability e-t/\tau. (b) Show...

The linked paper describes an experiment which is intended to provide for a basis for investigating solid state spin entangled electrons. Has solid state entanglement been demonstrated before? http://physics.aps.org/pdf/10.1103/PhysRevLett.104.026801.pdf

I roughly understand that when we hit a metal rod right into the end will excite longitudinal vibration in the metal rod, and the place we hold will be a node. the position i hold will kind of determine the frequecy of the ringing sound produced. Is that right? But what will happen if we hit...

Homework Statement " determine the diameter of a replacement solid shaft manufactured from the same material and subjected to the same maximum shear stress and torque" Ok so I previously calculated the following: Maximum shear stress= 35.8 x 106 Torque= 450.117 x 103 Hollow shaft...

Hi guys, i need some help on this topic. Basically, i need to calculate the angle of reflection of a oblique shock on a solid boundary. Here is the description of the question i have: an incident supersonic flow reaches a compression corner, with a deflection angle of 15 degrees...

Homework Statement let f(x)=x^3+x^5. Evaluate int((f(x)^-1)^2, x = 0 .. 2) The Attempt at a Solution i have a feeling that it has a relation with counting volume of a solid revolution.but i don't know how to answer it...

Homework Statement Our lecturer gave us a general equation for velocity of waves; (where c= wave velocity) c= \sqrt{\frac{\textrm{springiness}}{\textrm{massiness}}} (Excuse the terms, I'd personally rather have been given the equations here..) So for transverse waves on a string/wire...

How would one calculate the moment of inertia of a solid sphere (of uniform density, rotating about the axis through its center)? I know it's 2MR^{2}/5 but I got 3MR^{2}/5 when I attempted to derive it (just for fun, because I find rotational dynamics rather interesting). I would prefer a...

This is not homework, just my practise question for an exam. I keep getting an answer of 3/5MR^2 when the correct one is 2/5MR^2, and that was only because I fluked it by deciding to change my intergrand a little bit. I've some sources including one from hyperphysics which suggests...

Hi, It is common knowledge that the speed of sound is greatest in solids, then liquids and finally gases. But just thinking, if all things remain equal, how will the loudness of sound compare in the 3 states? My GUESS is that sound in gases could be the loudest. Loudness is defined as the...

Homework Statement assuming that the maximum shear stress and torsion are the same in both shafts design a hollow shaft to replace the solid one . the ratio diameters is to be 0.6 for the maximum shear stress i calculated 79.95 x 10 ^6 mn/m2 and for the torsion i calculated 122.78x10^3 in the...

when the copper is stretched,does its young modules keep constant? I am confused because the area will be decreased and the young modules is just related to the the material.

i need someone to explain to me where i am making a mistake because i am getting an answer that differs from that of the book. the solid lies between planes perpendicular to the x-axis at x = 0 and x = 4. the cross-sections perpendicular to the axis on the interval 0 ≤ x ≤ 4 are squares...

Hi, just a basic question , what are the main methods of determining the structure of a solid in order to test its genuinety i.e. gold... if i were to be given a piece of gold, how would i check that it is genuine gold? could i use x ray diffraction (If so what measurements /tests would i...

Homework Statement Find the volume of the solid whose base is the region in the first quadrant bounded by the curves y=x^2 and y=x, and whose cross sections perpendicular to the x-axis are squares. No idea what to do here

This shouldn't be a problem but I just can't this right! Homework Statement Find the volume of the body that is generated when y= 1/x(sqrt(4-x^2)) ,1 <= x <2, is rotated around the y-axisHomework Equations Using cylindrical shells : 2 pi ∫x (g(x)-f(x)) dx The Attempt at a Solution 2 pi ∫x...

Homework Statement CoCl4 2-+6H2O --> Co(H2O)62++4Cl-+energy If I add silver nitrate, which direction does it shift? I think it is no effect, because adding solid does not affect the equilibrium?... Am i right? Btw, what happen if i add aqueous to X gas --> Z gas + Y gas, vise verse... or gas...

String is wrapped around the outer rim of a solid uniform cylinder that is free to rotate about a frictionless axle through its center. When the string is pulled with a force P tangent to the rim it gives the cylinder an angular acceleration alpha. If the cylinder had twice the radius, but...

Homework Statement I am writing a paper on volumes of revolution. Unfortunately I haven't been able to find any suitable programs to represent them graphically. (I apologize if I am posting in the wrong forum.) Homework Equations Graphing the volume of revolution of, say...

http://img237.imageshack.us/i/lahaka.jpg/ http://img237.imageshack.us/i/lahaka.jpg/ So... I need to determine the deflection of the beam under applied force P due to flexural deformation using castiglianos second theorem. Simply, delta = dU / dP How do I determine the strain energy U for the...

now i am looking for the stress \sigma for the aluminium and for the steel i would want to say simply \sigma=F/A but i need to somehow take into account the types of materials and their elasticity, i think that hookes law could help me here but i don't know the strains also how do i take the...

Solid Mechanics questions - A new challenge :) Hi all :wink: I got 3 new questions that need to be solved in about 3-4 days as part of a 'challenge' homework. Those who solve correctly will basically get their names read out loud on the next lecture but I do it to understand the material of...