What is Shell: Definition and 783 Discussions

CONFIG.SYS is the primary configuration file for the DOS and OS/2 operating systems. It is a special ASCII text file that contains user-accessible setup or configuration directives evaluated by the operating system's DOS BIOS (typically residing in IBMBIO.COM or IO.SYS) during boot. CONFIG.SYS was introduced with DOS 2.0.

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  1. S

    Help with stability of full valence shell

    Hello, I am wondering about the real explanation that atoms have a tendency to have higher stablity with a full valence shell. What forces are at work here besides the 'happy' atom. -Scott
  2. D

    Find the net charge on the shell

    Can anyone help me with this problem? I've been working on it for hours and can't get anywhere with it, I just have no idea how to do it at this point. A cylindrical shell of radius 7.00 cm and length 240 cm has its charge uniformly distributed on its curved surface. The magnitude of the...
  3. S

    Exploring Orbital Shell Electron Limits and their Relation to Orbit Diameter

    Am very interested in why the inner shells have 2 electrons, the next couple have a couple more, and the rest all the same. If you would like to argue that its related to the diameter of the orbit then of course you have MAJOR issues to deal with. This is important and I'm hoping...
  4. O

    Finding Shell Commands and Answers in a Fedora Core 4 System

    Hi, My friend has installed a Fedoracore4 on my machine. I want to see what he has done with it to understand how. Is there any way see all the shell commands he has typed with all the answers the machine has given him?
  5. S

    Spherical conducting shell?

    Consider a thin spherical shell of radius 14.5 cm with a total charge of +39.1 micro coulombs distributed uniformly on its surface. (Take radially outward as the positive direction.) (b) Find the electric field 39.6 cm from the center of the charge distribution. Round your answer to three...
  6. denian

    Finding the volume with Shell method

    the volume that i get is a negative value, there must be something wrong with my working. is shell height = y + 2 - y^2 or i am wrong? tq.
  7. H

    Electric Potential of Conducting Shell: R1 & R2, Q at Centre

    In a conducting shell,with inner radius R1 and outer radius R2,and with charge Q at the centre,the Potential at surface is (kQ/R2),Why it is not (KQ/R1)?? :confused:
  8. S

    Heat current through a spherical shell

    A spherical shell has inner radii a and outer radii b. The temperatures at the inner and outer surfaces are T2 and T1. The thermal conductivity of the shell material is k. I have to derive an equation for the total heat current through the shell. The equation for heat current through a rod...
  9. M

    Finding the charge inside and outside a metal shell

    I'm confused on what this even looks like let alone trying to solve it. A ball of charge -50e lies at the center of a hollow spherical metal shell that has a net charge of -100e. What is the charge on (a) the hsell's inner surface and (b) its outer surface? The answers are: (a) +50e; (b)...
  10. M

    How to find centre of gravity for a hemisphere shell?

    How to find centre of gravity for a hemisphere shell?? Can someone show me how to calculate centre of gravity for a hemisphere shell??
  11. A

    Calculating the Net Force on a Spherical Shell Around the Sun

    I am beyond lost with the question, so any help would be greatly appreciated. Consider a solid, rigid spherical shell with a thickness of 100 m and a density of 3900 kg/m^3. The sphere is centered around the sun so that its inner surface is at a distance of 1.5×1011 m from the center of the...
  12. S

    Excite Inner Shell Electrons: Can It Be Done?

    Is it possible to excite the inner shell electrons to higher energy state? If not, why not? I'm aware of selection rules for atomic transitions and haven't come across anything that would indicate that those transitionss are forbidden
  13. D

    Conducting Sphere and Shell.

    Here's the problem that I have been trying to solve: A solid conducting sphere of radius 20cm is concentrically placed inside a spherical shell of inner radius 30 cm and outer radius 40cm. A Charge of 20uC is placed on the inner sphere, and a charge of -10uC is placed on the outer conductor...
  14. P

    When to use Washer, Shell or Disk

    I'm curious, when am I supposed to use Washer, Shell or Disk method when trying to answer questions involving integrals and volume? Is there something specific I should look out for? I just can't tell the difference. Any help is appreciated. Thanks.
  15. P

    Calculating Volume of Solid Using Cylindrical Shell Method

    "simple" shell I know this is relatively simple, but I'm a little rusty. Could someone help me out? We want to find the volume of the solid obtained by rotating the region bounded by the curves y=x^4 and y=1 about the line y=7 using the cylindrical shell method. According to my book the...
  16. D

    How fast is the shell moving when it hits the rocks?

    Seagulls are often observed dropping clams and other shellfish from a height to the rocks below, as a means of opening the shells. If a seagull drops a shell from rest at a height of 14m, how fast is the shell moving when it hits the rocks? X= 1/2 gt^t i got 1.68945 secs do I round off to...
  17. T

    Predicting Nuclear Spin with Shell Model: How is it Calculated and Validated?

    How would one predict the total spin of a nucleus given Z, N and the shell model? Does it have to to do with even-even, even-odd, odd-odd nuclei?
  18. B

    HELP:Volume generated( shell )

    HELP:Volume generated("shell") Find the volume generated when the region bounded by the graph of f(x) = 4x^2 and the graph of H(x) = 4 is rotated around the line y = -1 How do I solve this? How do I know if, when rotated, if the solid form a "shell" or a disc, or a washer?
  19. siddharth

    Photon in a Shell: Understanding Quantum Mechanics

    My Physics professor was teaching mordern physics yesterday and he gave us this experiment to ponder about Imagine we have a single photon in a spherical shell. The shell is 2 light years long. Now inside this big shell there is a smaller hemispherical shell with photon dectors at a distance...
  20. A

    Gauss' Law - Cylindrical Shell

    I'm stuck on two problems. I hope someone can help me. Here they are... 1) For 1a I thought Q would be Q=\rho \pi L (b^2-a^2) but since \rho=\frac{k}{r} so Q=\frac {k \pi L (b^2-a^2)}{r}. After being stumped on 1a I'm not sure how to go about 1b. 2) I've derived about 4 equations for this...
  21. Z

    Spherical shell of charge / electron

    I am having a problem understanding this problem which references this exercise . I tried it a couple different ways. I used \begin{multline*} \Delta U(Potential Energy) = Uf - Ui = Uf - U(r = infinity) = Uf - 0 \\ dU = Uf = -W = \int F * ds = \int E * Q * ds \\ Uf = -\int E * Q * dr =...
  22. A

    Shell Taxonomy: Identify & Learn Latin Names

    At school we've been given the identification of MANY shells as an assignement but we can't find good enough information in our poor books. Hence I'd like to know where I could find a good website about shells with ways to identify them (pictures if possible) and their full latin name...
  23. S

    Please help How to find the potential difference of a spherical shell

    I can frankly say I'm totally confused on how to solve this problem. Here it is: A think spherical shell of charge Q and uniform volume charge density p is bounded by radii r1 and r1 where r2>r1. WIth V=0 at infinity find the electric potential V as a function of the distance from the centre...
  24. G

    Conducting sphere in a conducting spherical shell

    A conducting sphere that carries a total charge of 6 micro C is placed at the center of a conducting spherical shell that also carries a total charge of 6 micro C . (a) Determine the charge on the inner surface of the shell. (b) Determine the total charge on the outer surface of the shell...
  25. G

    What Are the Components of an Egg Shell?

    Hard substances are rare in biology. Egg shells feel and crack like ceramics, but it probably has carbon in it. It's not like nails and horns is it (dry and dead cells right?)? Bone? Please help me understand hard biological materials.
  26. W

    Rotational inertia of a THICK spherical shell

    Someone please tell me is I am doing this problem correctly.If I have a thick spherical shell with inner radius r, outer radius R, and mass M, I am getting [(2/5)M/(R^3-r^3)](R^5-r^5). It is not the same thing as subtracting I of large sphere from I of smaller one, different than (2M(R^2-r^2)...
  27. U

    Laplacian in Spherical Shell

    I have a problem on my homework that is really confusing. I need to solve the partial differential equation in a spherical shell with inner radius = a and outer radius=b: (Laplacian u)=1 in spherical coordinates. The boundary conditions are u=0 on the inner radius r=a, and du/dr=0 on outer...
  28. tandoorichicken

    Show that the electric field outside the shell is everywhere

    A hollow spherical shell is uniformly charged with a total charge Q. Show that the electric field outside the shell is everywhere the same as the field due to a point charge Q located at the center of the shell.
  29. tandoorichicken

    What is the field outside the shell?

    A point charge Q is at the center of a conducting spherical shell of radius R. The total charge of the shell is -Q. (a) What is the field in the region between the point charge and the shell? (b)What is the field outside the shell? I think I got part (a): F = \frac{kq_1 q_2}{r^2} =...
  30. C

    Understanding Shell Electrons and Electron Configuration in Krypton

    I can't make sense out of this question. Krypton has 36 electrons. How many electrons are in the n = 5 shell? It's in the 4th period so why are they asking for the 5th shell? The answer is listed as 4 electrons but how? 2,8,18,8 = 36 so Kr has 8 in the last shell (n=4)
  31. J

    Volume, washer method and shell method

    I don't understand how to set up the washer and shell equations. When you are given the function and the line to rotate it around, or two functions and a line.
  32. M

    Why do atoms want a full outer shell?

    Why do atoms want a full outer shell
  33. P

    Are Our Emotions Merely Code in an Elaborate Program?

    [SOLVED] ghost in the shell And I stand back and wonder what could possibly be so hard in accpecting that all we hold around us is natureal in origin? That all our emotions are just really well written code in a very effective program?What is it with this prepetual human instinct to separate...
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