Shell Definition and 750 Threads

E Field in a shell(!) I have a shell with an inner radius 2m and an outer radius 3m and a cahrge q on the shell(distributed) , why is the E field at 1m is zero(charge enclosed is zero inside the sphere i can obtain it is zero but why doesn't the E field lines go into the shell)(this can be...

How can I load a .py file in the python interactive shell for debugging?

A hollow spherical shell with mass 2.10 rolls without slipping down a slope that makes an angle of 34.0 with the horizontal. Find the magnitude of the acceleration of the center of mass of the spherical shell. I understood that the friction force is normal to the slope and there is a...

I am completely lost on this one; An artillery shell is fired at an angle of 85.1 degrees above the horizontal ground with an initial speed of 1960 m/s. The acceleration of gravity is 9.8 m/s/s. Find the total time of flight. Can someone do it and explain how to do it?? Thanks so much!

[SOLVED] thermal expansion hi everybody my question is: a spherical shell is heated. the volume changes according to the equation V(T)=V(0)(1+yT) where y=volume coeff. of thermal expansion. does this volume refer to the volume enclosed by the shell or the volume of the material making up the...

hi all! is there anybody who can help me with shell balance? one of my main questions is wat are the main assumptions wen we apply shell balance... moreover.. can anybody suggest a gud book or site/tutorial wer i can get a hang of shell balance properly? thank you!

Hi! I have a project where I am supposed to model the s-process in a star in its Helium shell burning region, and i shall do this for a variation of neutron exposure, where neutron exposure are defined as: \tau = N* \Delta t , t is time. N is number density of neutrons. So I in...

Homework Statement Show that the moment of inertia of a uniform thin spherical shell of mass m and radius a about a diameter is 2/3 ma^2 Homework Equations Moment of inertia = Sum m x R^2 volume of sphere = 4/3 pi r^3 The Attempt at a Solution I think i have to integrate the...

A half spherical shell as seen in the picture. http://img219.imageshack.us/img219/3424/picnw3.th.jpg charged with surface density \sigma(\theta)=\sigma_{0}cos\theta Need to find the Electric field in center of the axis. As I see the direction of the electric field is the Z axis...

Homework Statement An artillery shell is fired with an initial velocity of 300 m/s at 55.0 degrees above the horizontal. It explodes on a mountainside 42.0 seconds after firing. What are the x and y coordinates of the shell where it explodes, relative to it's firing point? We know that it...

Homework Statement two problems. i am confused about their processes. they are almost the same but some things look strange. problem 1: A cannon on a level plain is aimed 50deg above the horizontal and a shell is fired with a muzzle velocity of 360m/s toward a vertical cliff 950 m away...

Hi guys, I've been on a few message boards looking for a solution to my problem, but no one has really been able to help me yet. Here is the problem: Question=================== Hi all, this is my first post/thread, just starting out as a second year chemical engineer and I seem to...

A shell traveling with velocity vo explodes into three pieces of equal masses. Just after the explosion, one piece has velocity v1=vo and the other two have velocities v2 and v3 that are equal in magnitude but mutually perpendicular. Find v2 and v3 and sketch their velocities. In starting...

Using the conservation of momentum I need to show that a gun firing a shell will equal: v=v(1+m)M Where the gun of mass M shoots a shell with mass m and a velocity of v. There are no external forces, ie the gun is free to recoil. And its the velocity with respect to the ground... This...

An insulating spherical shell of the external radius b and the internal radius a is charged uniformly with volume charge density p. What force F does it produce on a uniformly charged thin rod, as shown in figure2? Rod's total charge is Q and length 2a. The rod is arranged radially from the...

Homework Statement A long cylindrical insulating shell has an inner radius of a = 1.38 m and an outer radius of b = 1.61 m. The shell has a constant charge density of 4.80 C/m3. 1. What is the magnitude of the electric field at a distance of 1.87 m from the axis? 2. What is the magnitude...

For the configuration shown in the figure below, suppose that a = 5.60 cm, b = 19.8 cm, and c = 27.9 cm. Furthermore, suppose that the electric field at a point 13.7 cm from the center is 3.44 x 10^3 N/C radially inward, while the electric field at a point 47.0 cm from the center is...

Can someone tell me how the outer shell structure is determined from the electronic structure. I know i can look this up but I'd like to know how it is derived and are there any rules I should follow so i can determine them myself?

I'm going through The Feynman Lectures On Physics. I've taken a few classical physics classes before, however Feynman's detailed explanations are much better than anything I've gotten from my teachers. However, I'm having a little difficulty following the mathematics when he tries to show that a...

Hai' I am new to the Linux os & i am eager to learn shell scripts for my engineering applications. How to learn step by step any suggestions? I am not aware any programming languages. For my immediatiae application is We have installed custom build software in one particular folder...

I want to derive equation of continuity in spherical coordiantes based on shell balance,can anybody tell me where the hell this sin(theta) comes from? i don't want to transform from cartesian,

I have never written a shell script, but I am trying to learn. I want to make a generic Unix shell script that will allow me to run four commands in a row... something like this... latex $filename bibtex $filename latex $filename latex $filename I would like to call the script...

Hi, I'm trying to build a shell for Linux, programming it in c currently. I need to be able to read a command like 'copy2flash' so that it'll copy itself to another flash memory, but right now I need the case instruction to be able to recognize the command and print something like "copying to...

Homework Statement A thin, spherical, conducting shell of radius R is mounted on an isolating support and charged to a potential of -V. An electron is then fired from point P at a distance r from the center of the shell. (r>>R) with an initial speed v_0 and directly towards the shell's...

How to solve this problem and how to graph it? Please help... y=x^2, y^2=x, about x=-1

Homework Statement I'm well aware of how to compute the gravitational [electric] potential \Phi due to a spherical mass [charge] distribution of radius R by using Newton's theorems for spherical shells. However, how does one find an analytic expression for \Phi without invoking these theorems...

1) A shperical sheel has inner radius R_in and outer radius R_out. The shell contains total charge Q, uniformly distributed. The interior of the shell is empty of matter and charge. Find the electric field for (a)r>R_out, (b)r<R_in, and (c)R_in<r<R_out respectively. Then sketch a graph of E...

I think I've got it set up correctly, but I'm stuck on the integration. Use the method of cylindrical shells to find the volume generated by rotating the region bounded by y=e^(-x^2), x=0, x=1, rotated about the y axis. \begin{array}{l} \int\limits_{\rm{0}}^{\rm{1}} {\pi r^2 h\,\,dx}...

Homework Statement A solid conducting sphere of radius 2.00 cm has a charge 6.70 µC. A conducting spherical shell of inner radius 4.00 cm and outer radius 5.00 cm is concentric with the solid sphere and has a charge -3.50 µC. Find the electric field at the folowing radii from the center of...

Homework Statement Right have a shell that has a volym charge distribution P=(G/r^2) and with inner radius a and outer radius b. Now what is the e-field at r<a, a<r<b, r>b Homework Equations gauss's law: surfaceint[E.da]=Qenclosed/epsilon0 Qenc=volymint[PdV) The...

Homework Statement Consider a thin spherical shell having surface charge density σ, and radius a as shown in the diagram (see attachment). Find, by integration over the sphere, the potential at a point P, a distance r fromthe centre of the sphere, for r > a. Using this result also find...

Hey, The Fock operator for a closed system is given by f = H(core) + sum (2*f - k) where f is the Coulomb operator and k is the exchange operator. The summation goes from 1 to N/2. My questions is why is the summation to N/2 and why does one have to multiply the Coulomb operator by 2...

Hi people, I'm wandering what the distances of the levels of the electron shell are relative to the centre of the atom. I was told there's a pattern and am investigating it. Regards, Dan

Homework Statement An infinite cylindrical shell has inner radius 'a' and outer radius 'b'. The shell carries a charge density J(s) = Cs^2 + Ds. Where 'C' and 'D' are constants. Find B everywhere. Homework Equations The Attempt at a Solution My thought was to find the field do...

Homework Statement spherical shell with inner and outer radii a and b, and with temperatures of the inner and outer surfaces T_2 and T_1, the thermal conductivity of the shell is k, derive an equation for the total heat current through the shell Homework Equations...

im stuck and my book doesn't explain much on how to get the volume of a shape by the cylindrical shell method. What i really need is to show how to get the general formula of a volume of a sphere and a cone using cylindrical shells.

Hello Dudes, I m writing a C shell code in UNIX that takes a user command and executes it, my shell must support the redirection and piping too. Well i succeeded in writing the first one (takes a user command and executes it ) but i m stucked in the other parts :( Can anyone help ...

Griffith's EM problem 3.28 A spherical shell of radius R has a surface charge \sigma = k \cos \theta a) Calculate the dipole moment of this charge distribution. i know that p = r' \sigma(r') da' but here sigma depends on theta would the dipole moment p then turn into p = \theta'...

In my chemistry textbook it says that the electron shell, represented by a value n>= 1, refers to the distance of the electron from the nucleus. It also says that the subshell (represented by L) refers to the shape of the electron cloud. The p subshell is shaped like a peanut or figure eight. My...

I never really understood this... Lets say we have a positive point charge Q at the center of a spherical conducting shell of an inner radius Ri and an outer radius R0. Now my books says that an amount of negative charge equal to -Q must be induced on the inner shell surface (R=Ri), and...

Guys...i want to have your views on this...like what's the reality,,i mean whatever i read on internet had a very bad image on me regarding shell... i want to listen you...what do you think?? and some links for who are unaware of this... http://www.essentialaction.org/shell/issues.html...

A hollow spherical shell carries a charge density \rho = \frac{k}{r^2} in the region a<= r <= b. As in the figure Find the elctric field in these three regions i) r <a ii) a<r<b iii) r>b SOlution: for r<a it simple.. no exclosed charge for any gaussian sphere within that region...

Use the method of cylindrical shells to find the volume of the solid generated by revolving aabout the indicated axis the region bounded by the given curves. x=y, x+2y=3, y=0; about the x axis. Latest version of my work: (I don't know how to paste a graph into the post. But I graphed my...

A charge punctiform of Q= 12*10\exp-6 C is in the center of a spherical shell conductor charged negatively Q1= 6*10\exp-6 C, and of internal radius = 22 cm ad external=26 cm. Calculate the electric field and potential.

Please help! How do I do this problem? Using the method of cylindrical shells, find the volume generated by rotating the region the region bounded by the given curves about the specified axis. y=(x-1)^(1/2), y=0, x=5; about y = 3 Please tell me how to set up the integral! Any help is...

Please help! How do I do this problem? Using the method of cylindrical shells, find the volume generated by rotating the region the region bounded by the given curves about the specified axis. y=(x-1)^(1/2), y=0, x=5; about y = 3 Please tell me how to set up the integral! Any help is...

find volume: y=x^2, y=0, x=1, x=2 about x=1 I found the height to be x^2 and circumference to be 2pi(1-x) So V= \int_1^2 2\pi(1-x)(x^2)dx This is not giving me the right answer.

Gauss' law---thin spherical shell INTRODUCTION- hello, actually i had been doing some problems on gauss' law from H.C.Verma "concepts of physics". I'm continuously having problem with "wht's the field on the surface of a thin spherical, conducting shell? THE EXACT PROBLEM IS- "Consider the...

"I think energy independence is going too far" - Shell Oil http://www.msnbc.msn.com/id/13296235/page/5/ I think it is clear that this is not who we need making the calls for what's good for the US. Energy needs to be taken out of the hands of big oil...

As a parent, how would you feel about finding these items in your house? http://www.davesbrain.ca/miscpix/shells.jpg These are about the size of .22 cartridges. It says 'cartridges for low velocity tools'. That's like an airgun, right? I would be very unhappy to find fireworks hidden...