Solids Definition and 302 Threads

well trying to help my little brother with some chem homework, and i believe i am just thinking too hard about this question anyways its a whole chem lab thingy about the composition of pennies and one of the thinking questions is now when it says "identity" I am assuming they are...

Homework Statement What are (a) the x coordinate and (b) the y coordinate of the center of mass for the uniform plate shown in Fig. if L = 5.0 cm? http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c09/fig09_38.gif Homework Equations The Attempt at a Solution So I think...

I'm looking for some notes concerning the following areas: Vibration in solids, Phonons, Specific heat capacity of solids, Electron gaz in solids, Debye model, stuff like that, any help ?

[SOLVED] Sound waves in solids? Hello! As far as i have learned sound waves are longitudinal! They propagate in gases liquids and plasmas. Does sound waves propagate through solids too? If so, what type of waves? Longitudinal or transversal? Thanks Note:If you consider this homework, sorry...

[SOLVED] platonic solids Homework Statement Let f_1 be a face of one tetrahedron and let f_2 be a face on a second same-sized tetrahedron. Why do you not get a sixth Platonic solid when you identify f_1 and f_2, which you can do because they are the same triangle?Homework Equations The...

Hi, I have a question regarding appropriate methods of finding volumes bound by geometric solids. I can work through the math in MatLab by finding points in common within each solid volume...but it is very laborious and I thought that I'd ask you math people how you would tackle this...

Hey, I just finished a lab on classifying solids based on their physical properties. I was just curious about some of the solids that I investigated. Wax (a non-polar molecular solid) and salt (ionic solid) were pretty weak -either melted or dissolved compared to network solids like clay and...

Hi all, I was wondering whether someone can help/guide me. I am doing a project that involves sound propagation in solids. Basically, I have two microphones placed on a surface (say a piece of wood). Then, when a person taps on the surface I can detect the tap and determine the amplitude of tap...

Q 1. A brass rod and a lead rod each 80 cm long at 0 degree celsius are clamped together at one end with their free end coinciding. The separation of the free ends of the rod if the system is placed in a steam bath at 100 degree celsius is ( coefficient of linear expansion of lead =...

Homework Statement How do you express work in an isothermal increase of pressure of a solid in terms of the initial and final pressure? Homework Equations van der waals equation W=Integral of PdV (P-na/v^2)(v-nb)=nKT P=pressure V=volume n=number of molecules(constant)...

Oh god, please help... 1. Describe the attraction forces between atomic solids. Upon what factors do the strength of these forces depend? 2.Which of the noble gases would have the highest melting point? Why? :blushing:.. I'm not very good at chemistry

Homework Statement In a sample of seawater taken from an oil spill, an oil layer 4.0 cm thich floats on 55 cm of water. If the density of the oil is 0.75 x 10^3 kg/m^3, what is the absolute pressure on the bottom of the container. p= 0.75x10^3 kg/m^3 g = 9.8m/s^2 h=.55m p=? pa =...

Homework Statement Hang a 0.25 kg rock from the end of a spring. If the spring stretches 0.25 m, what is the spring constant? Homework Equations i'd assume F/A=Y(Change in L/Lo) The Attempt at a Solution I can do it if there was Area, but there isn't. there's probably another...

I would type the problem but it's really long. I just need to know what the two different results are for dissolving solids because I completely forgot. I think it has to do with if you can bring them back or not ?

I would like to know how material solids of exact composition stay apart from one another? Additional...Gage blocks (steel), while unmagnitized,can be "rung" together. I know that solids have structured atoms and are hard to compress and all that stuff...Help!

I started reading a great textbook and thought I would share some of its finer points. It is a great introduction to mechanics of solids and liquids, although the title explicitly states Earth and Environmental Sciences. http://www.science.mcmaster.ca/~geo/faculty/emeriti/middleton/index.html...

Homework Statement Volume of Torus: using Shell's mehod 4\pi \int^{1}_{-1}((R-x) \sqrt{r^2 - x^2})dx Homework Equations The Attempt at a Solution I don't know how to integrate this at all. I cannot use any conventional methods...or I can't think of a way... i.e. use isolate a function as...

Anyone have any advice for finding volumes of solids that are not solids of revolution? I have a much more difficult time starting these kinds of problems compared to revolving ones.

I'm having trouble with problems where you have to find the volume of a solids that are not solids of revolution. Can someone help me with these problems and also tell me a general way of approaching these problems? Thanks Homework Statement A hole of radius r is bored through the center of...

Homework Statement A steel ring with a hole having area of 3.96 cm2 is to be placed on an aluminum rod with cross-sectional area of 4.00 cm2. Both rod and ring are initially at a temperature of 36.0°C. At what common temperature can the steel ring be slipped onto one end of the aluminum rod...

My chemistry textbook tries to explain the properties of solids and liquids with the kinetic theory. Is this not good? Should only gases be explained by the kinetic theory since one of the postulates in this theory is that particles exert no forces on each other. The book had to disable this...

For the random walk approach to gases, liquids, or solids, why isn't there a gradient? The atoms don't jump by themselves, right? They should have to feel forces to jump...

I am having a review test soon and I was not taught anything about ionic stuff last year, I have no idea what it is at all. Sample questions look like: "which of the following compounds are considered to be ionic solids? If it is an ioni solid, write an equation showing the dissociation of...

This questions puzzles me: Which has a larger specific heat capacity (shc) : solid, liquid or gas. We can assume that it is of the same matter. Why? I have checked the numbers. Only water has it on all three states. Liq water has the highest, while that of ice and steam is about the same...

Since metals are neutral, and their electrons delocalized, is the number of electrons in a metallic solid equal to the number of protons in the solid? Also I am guessing that the valence shells of the metals are not complete? I am confused on this regard. Furthermore, I can see how the myriad...

Hi, Could someone explain why when comparing a materials dielectric constant in solid form it is sometimes higher in pellet form and sometimes lower for other materials. For example, Polypropylene has a dk = 1.5 when in a solid (lump) block. This then becomes dk ~ 1.5 - 1.8 when in pellet...

Sir, Why does solid expand on heating? The answer to this question given in my book is “The potential energy curve is asymmetric about the equilibrium distance between neighbouring atoms. Is it right? I think solid expands due to increase in kinetic energy of atoms.

Find the volume formed by rotating the area contained by y=sqrt(6x+4), the y-axis and the line y=2x about the y-axis. Set up, but do not evaluate the integral. First I graphed it, then did the "washer" method of finding the area of the circle formed, and found that the radius is...

i have 2 calculus questions that are due in the next half n hour and i have no idea how to even start them. I hope somoene can help me in time. Question1 Find the volume of the solid obtained if the plane region E bounded by the curve y=x^2 and y=x^3 between x=0 and x=1 is rotated about the...

Can I use molar ratios for gasses, solids, and aqueous solutions all in one equation? For instance: Mg(s) + 2 HCL(aq) -> MgCl2(aq) + H2(g) Can I say that if i had 2 moles of Mg I would have 2 moles of H2. Does this trick have anything to do with Amedeo Avogadro?

I am having a lot of trouble with these types of problems.. this one is on a homework assignment and i don't know where to begin. heres the problem : The sepcific heat of lead is 31.0 calories per kilogram per Celsius degree. (a) Find the heat necessary to raise the temperature of 1.30 kg of...

Author: Dr. Donald Luttermoser of East Tennessee State University

Hey folks... I've been thinking about using integration to deal with the volumes of various objects such as: Cylinders: For cylinders, I used integration to find the volume. I imagined the area of a circle, which is \pi*r^2 and then decided that if I stacked a series of solid disks (which...

Hi everyone. I'm not a physicist but I need some help. In the hypothetical situation of a 1 kg block of concrete being dropped onto a concrete slab from 3 metres, the force of the impact is easy to calculate. However, if one were to pick up the pieces and re-drop them, what would be the force...

Hello all, This is my first post here. My apologies if this is in the wrong place. I'm building an electrolysis device using potassium hydroxide (KOH) as the electrolyte and I don't know the formula for determining the correct percentages. I'm trying to dilute caustic potash from 45% KOH &...

For your thoughts... a theory of mine... A Method by which shape shifting strings may explain: 1. Plasma 2. Hydrogen 3. Helium 4. Neutrons 5. Gasses 6. Liquids 7. Solids Consider the following: If a string, was a string, in shape, in only one STATE of its existence, then one...

Guys can you suggest me some nice book on Mechanics of Solids! I find "Crandall and Dahl" doesn't go deeper in explaining basic concepts! I am looking for a which maintains balance between depth and applications!

In a lecture of Mechanics of solids ,the instructor said, For an rigid body to be in equilibrium it should have no tendency to either displace or rotate(that's okay!)but for deformable bodies each & every subsystem should be in equilibrium! I wonder how it is that body can be in...

Hello all, I need to know the rate at which Helium will diffuse through a solid, specifically silicon. Assume I accelerate and implant a He+ ion into a bulk silicon substrate. How long will it take to diffuse out of the silicon? I know it will depend on the temp of Si and the depth of...

matlab & solids of revolution?? Does anyone know if MATLAB can graph solids of revolution by just using the information contained in the integral form of the problem? :confused:

The base of the solid is the disc x2+y2=1. The cross-section by planes perpendicular to the y-axis between y=-1 and y=1 are isosceles right triangles with 1 leg in the disc. Find the volume of the solid. I did the problem, but I am not sure if I did it correctly, and if I did I really just...

Rutherford's idea that atoms are mostly empty space is retained in all subsequent atomic theories. So, how can solids be solids? How can a chair support you, why don't you fall through. Is it because the atoms are so close together??

I took Honors Chemistry this year with the assumption I might actually get some good questions answered, but alas, no such luck. When we went over different stages of matter, the teacher used those little diagrams I'm sure you've all seen to describe how solids, liquids and gasses differ. The...

Recently I took an introductory course on Group Theory applied to chemistry, and learned about symmetry applied to molecular vibrations and how to detemine the detection of the vibrational nodes in IR and Raman Spectroscopy. My interest is to be able to use Infrared spectroscopy to...

I have three questions about sound waves. I could have asked my physics teacher but he fails to answer almost all the question out of our syllabus. :mad: 1- We have read that the speed of sound in solids doesn't depend on their desities. If that's the case then they depend on what thing...

Ok. I just need someone to explain the methods for me, if it's not too much trouble. I know you have the shell method, disk method, and washer method. I am taking AP Caclulus BC in high school. I want to know if all of these methods are useful of if one of them is more important. Thanks...

I'm attempting to find the volume of the solid obtained by rotating the region under the curve: e^{-x^2} Bounded by y = 0, x = 0, and x = 1. I've done quite a few of these problems before, however, none of them have involved an exponential. If I recall correctly e^{x^2} cannot be...

i've tried searching but I'm not sure of the proper name for these things... interested in 'holographic' displays but without the normal glass or anything. i was thinking maybe there is an invention that uses lasers and/or interference to produce light/whatever. do you know? thx

Most children, play with toy telephones by connecting two plastic cups with a long string. When the string is pulled tightly, sound is transmitted from one cup to the other. How does that thing work? (I 'm used to play with it but I ignored that fact). Another one... doctors use...

Hi folks and happy new year, As usual i have been leafing through some old physics books and have stumbled across something that has confused me, wonder if you can help. Having looked at a 'classical' graph of interatomic potential energy against distance within a solid and how it relates to...