Solids Definition and 313 Threads

Homework Statement Hi, well, I don't have to solve any problem yet. I have an inquietude about solids of revolution. I've been reading this: http://en.wikipedia.org/wiki/Solid_of_revolution and this: http://en.wikipedia.org/wiki/Disk_integration What I wanted to know is if its the same this...

1. Concrete pier with dimensions of 50' wide 100' tall and 5 feet deep. There are 2000 people standing on top each 200 pounds. Two holes are bore through the concrete one center 25 feet from the top the other 25 feet from the bottom, and it is on the side that is 50 feet wide right in the...

Statement: The ancient Greek philosopher Plato theorized that the http://en.wikipedia.org/wiki/Classical_element#Classical_elements_in_Greece". I'm not a philosophy or science student, so please keep your reply plain and straightforward. Thanks. I can understand the literal meaning of the...

Find the volume of the solid st, 1. y=cos x , y= 0 in [0,pi] ; Rotated around x=1 2. I am slightly confused, I see that the area will double around twice so I can just use the left half of the curve. I am just not sure how to do so.

Homework Statement Describe what influence the periodic structure of a crystalline solid has on the energy distribution of the free electrons, and hence explain, in general terms, why some solids are electrical conductors and some are insulators. Homework Equations The Attempt at a...

Homework Statement A small dam of triangular shape as shown is made from concrete. Find the stresses on the foundation at A and B. Assume concrete and water weighs 25kN/m^3 and 10kN/m^3 (All dimensions in the attached picture are in metres) Homework Equations sigma = force/cross...

Homework Statement A siphon tube is filled with gasoline and closed at each end. One end is inserted into a gasoline tank 0.20 m below the surface of the gasoline. The outlet is placed outside the tank at a distance 0.50 m below the surface of the gasoline. The tube has an inner...

stuck with a problem...on linear thermal expansion of solids Homework Statement I just read a problem 2day...it's on linear thermal expansion of soild...can anyone guide me through...it says..." A sqaure ABCD is made with two different metals...the coefficient of thermal expansion of the...

Homework Statement SAE no. 10 oil has a viscosity of 0.2 Pa· s. How long (in sec) would it take to pour 4 liters of oil through a funnel with a neck 10 cm long and 2.9 cm in diameter. Assume that it is poured in such a way that the oil level is kept just above the top of the tube. Hint...

Homework Statement A metal rod of length 1.0 m is hit with a hammer at one end. It takes 5.5x10^-4 s for the compression pulse generated to travel to the other end and reflected back to the end hit by the hammer. Find the Young Modulus of the metal. (Given: density of the metal = 9.0x10^3 kg...

Suppose I have single crystal of Quartz, and I break it in half. It took energy to break the crystalline bonds of the crystal. Now, I take my 2 crystals, and fit them together along the break line, so that they are flush with each other. Why should the 2 crystals not spontaneously conjoin...

Homework Statement A circle with a radius of (a/2) is bored through the centre of a sphere of radius a. Find the volume of the remaining solid. Homework Equations The Attempt at a Solution I've been trying this for an hour now and I've been trying to find the remaining volume by...

Hi, I have the area D(x,y): \sqrt{x}e^{x^2}\leq y \leq 3,~~ 0\leq x \leq 1 That is rotated about the x axis, and i need to calculate the area \pi \int_0^1 3^2-y^2 = \pi \int_0^1 9-xe^{2x^2} \frac{-9\pi}{4}\cdot (e^{2x^2}-1)\bigg|_0^1 But this is all wrong, why?

Hi, The area e^x-1 Is rotated about the y axis, bounded by y=1, x=0 and x=ln2 find the volume of the solid. And i am clearly making something wrong, so if anyone could verify my work. ~ 2\pi\int_0^{ln2}x\cdot(1-(e^x-1) -2\pi\int_0^{ln2}xe^x-2x Integration: u=x, du=1 dv=e^x, v=e^x...

Can anyone help me with this calculus problem? I have tried it a couple of different ways, but keep getting various incorrect answers; I think my problem is probably in the setup. I am trying to find the volume of the solid created by revolving the area bounded by these two equations y = 6 -...

Homework Statement The rope BC exerts an 800 N force F on the bar AB at B. Determine the vector components of F parallel to the bar. Homework Equations I already know how to complete dot product (e.g. a.b), cross product (e.g. axb) and understand the basic principles of these...

I simply do not understand what the young modulus is. Help on properties of solids such as ductility and malleability would help!

Homework Statement Hey everyone. In my calc course I need to create (or find on the web) a problem and apply the below two concepts that I learned in the class. Concepts: Solids of Revolution. Integration Techniques: Parts, Substitution, or Partial Fractions. Homework Equations The problem...

I've been thinking, what sort of effects would changing the dimensions of a solid, (lets say a block of wood, or plank.) have on the sound waves passing through it. For example, let's say I take a block of wood, and reduce the mass and surface area (I.E cutting the ends off a plank)? or cut...

I'm currently having a discussion with a guy that absolutely says that vapor and gas are the same thing, and they both contain solids, and that's how we see them. I suggested maybe the evaporated vapor that comes off gasoline as you pour it wouldn't have any solids in it, to which he said I'm...

Hi, I'm currently doing experiments on a 99.9% TiO2 source powder. I was wondering if there is anyway to lower the melting point of this solid? If possible, without compromising its purity. I only have access to an electrical furnace that is capable of reaching a maximum of 1200 degC...

I always have trouble sketching regions and solids. For example, if one solid described by the inequialities (in spherical coordinates) where ρ <=2, and ρ <= csc(φ) I don't get how to interpret the cosecant part. Thanks.

Hi all Am I correct to say that - in general - the thermal conductivity of metals is higher than that of semiconductors, because metals have more free electrons to help conduct the heat? And is it correct that phonon-contribution to heat conductivy is more or less the same for all solids...

Homework Statement Intermolecular forces are 1- Attractive only 2-Repulsive only 3-Long-range 4-Short-range Homework Equations The 1st and 2nd options are not valid as the nature depends on the distance between the molecules. The Attempt at a Solution The answer given is...

Homework Statement Figure 7-29 shows a composite slab with dimensions 22.0 cm multiplied by 13.0 cm multiplied by 2.8 cm. Half of the slab is made of aluminum (density = 2.70 g/cm3) and half of iron (density = 7.85 g/cm3), as shown. How far from the line joining the two metals is the center...

Recently, I came across some who suggested that a plasma between half the temperature of the sun (2889 K) and the temperature of the sun (5,778) would have the same burn patterns as lava. I felt skeptical about this for two reasons Lava's viscosity affects how it behaves. I did not think...

I am reading the Band Theory of solids.Now, my question is on the basic concepts: {1}When energy is given to a solid, the electrons bound to the respective atoms move from the valence band to the conduction band and hence conductivity of material increases. {2}But we know that when we give...

With the huge distances between atoms, relative to the size of the atoms, why aren’t photon packets able to travel through most “solids”? Why are those same photon packets able to travel through many liquids?

I am curious. Maybe I don't understand something, but many articles I come across perform an energy balance on a solid and on a liquid. **I assume evaporation acts on the remaining liquid and not directly on the substrate. Correct?** They always include heat loss due to evaporation as...

Homework Statement Homework Equations The Attempt at a Solution I think Graphite is a Van der Waals' Solid and, er, salt would be an ionic. But I really don't have much of a clue about what the second part is going on about! Thanks! :)

Homework Statement What is the reason for energy bands in solids? Homework Equations The Attempt at a Solution because of close proximty of atoms

Show how the band model can explain the relationship between the optical and electronic properties of solids? any ideas one were to start looking? lost with this question

Homework Statement When the water freezes it expands by about 9.00%. What pressure increase would occur inside your automobile engine block if the water in it froze?(The bulk modulus of ice is 2.00 x 10^9 N/m^2).Homework Equations B=\frac{\Delta P}{\Delta V / V_i} The Attempt at a Solution If...

Most solid components I need to consider at work have a specific heat of about 1 kJ/kg/K. Why is that so? Any explanation as simple as for perfect gases? Thanks

Homework Statement Find the volume of the solid T enclosed above by the sphere x^2+ y^2 + z^2 = 2 and below by the parabloid x^2 + y^2 = z Homework Equations The double integral. Possiblly polar coordinates (x = r*cos(theta) y = r*sin(theta)). z = f(x,y) The Attempt at a Solution...

The angular inertia of a rectangular prism. http://www.turboimagehost.com/p/1595403/untitled.JPG.html http://www.turboimagehost.com/p/1595403/untitled.JPG.html (how do i put an image)I don't know any math, besides algebra. I know some physics...

Homework Statement The deepest point in any ocean is in the Mariana Trench, which is about 11 km deep, in the Pacific. The pressure at this depth is huge, about 1.13 108 N/m2. (Take the bulk modulus of seawater to be 2.34 109 N/m2) (a) Calculate the change in volume of 1.2 m3 of seawater...

I want to be able to differentiate between longitudinal(P) and Shear(S) waves in solids. Using one Acoustic emission (AE) senor placed 2 to 20 cm form a AE source e.g. a stress induced crack or pencil lead test, how can one detect both the P and S waves and determine what part of the receive...

Homework Statement Consider the interation of two einstein solids, A and B. A has NA particles and qA units of energy and B has NB and qB units of energy. find the most probable values of qA and qB when equilibrium is reached. Homework Equations The Attempt at a Solution I set up...

y=x^2 ; y=4; rotated around x=2 im seeing a washer cross section with r=2-y^(1/2); im unclear on how to get R to calculate the area it seems to be 2r but this produces incorrect results.

My question is: Simple kinetic model for solids, liquids and gases. I searched on google and find these result but I don't know whether it was right. And also I think it is too long to do in an exam. :smile:. Please help me to check it. Thank you. Model for liquid This is the link for the...

Deformation of solids, please help! The question is: 1/ Show a qualitative knowledge of typical behavior of copper, glass and elestomers. 2/ Quantitative treatment of deformation in one dimension including work done; experimental determination of the Young modulus for a metal in the form of...

What is a spin liquid as opposed to a spin solid or a spin glass? I know that a spin liquid is generally defined by geometric frustration in the electronic spins of that material (i.e. pryochlore structure)...but how is this different from a spin solid? Can it be that the lattice of the...

Hello! If ionic solids are to dissolve, then \Delta H_{solution} has to be negative, (possibly 0? For equilibrium?). This can occur if \Delta H_{hyd} for both the cations and anions is greater than the \Delta H_{LE}. But the textbook also states that a positive \Delta H_{solution} can also...

Mechanics of solids prob. help! here is a prob. i have.anybody help. Three beams have the same length, the same allowable stress and the same B.M. The cross section of the beams are a circle, a square, and a rectangle with depth twice the width. weight wise best section in order of merit will...

I was given a question about a certain material. The idea was that when it was heated from zero degrees C to 200 degrees C, it would be 10.06 mm from its original length of 10. Doing it in reverse order, length of 10.06 mm from 200 C to 0 C gave me an answer of 9.99964, which is less than the...

Homework Statement the stiffness of the interatomic "spring" (chemical bond) between atoms in a block of lead is 5 N/m. Since in our model each atom is connected to two springs, each half the length of the interatomic bond, the effective "interatomic spring stiffness" for an oscillator is 4*5...

Does anyone know of any good Diffusion (ie. Fick's laws, interstitial jumps, etc) online resources? Thanks!

Dear all, I'm coding the calculation of the free energy of an SiO2 crystal structure Using a 2-body Buckingham potential. I'm attempting to use the method of Frenkel and Ladd which consist in transform your solid reversibly into an Einstein crystal. I've read the excellent book...

We have this book as a text for oour Mechanics of Solids Course. I have solved many sums from the book but i don't have any place to compare the answers i have got with. Have hunted the net for the net but to no avail. Can anyone help me with a website which has atleast the answers of the...