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.

View More On Wikipedia.org
Recent contents Top users
  1. rootX

    ImageShack and Shell programing

    I am creating a product (for personal use) when I left click an image, "Upload to ImageShack" should show up and when I click that I want to upload the file to image shack and provide me the uploaded file address in dialog box/other ways Currently, I am working on .Net web application. I...
  2. K

    Cylindrical shell and cross-section volume concept question

    When a problem with a number of equations is given, asking to find its volume, a student has a choice between the cylindrical shell method and the cross-section method. However, regardless of what method is chosen, do both answers end up being EXACTLY the same?
  3. D

    Electric Field of Dipole, straight line, ring, disk, shell, and sold sphere

    Homework Statement Okay, I totally do not understand how to derive the electric field made by a dipole or a line or a ring or etc. Homework Equations When finding the electric field, when you make an estimate, saying that the test charge is very far away, it should be similar to kQ/r^2...
  4. H

    Opening PDF Files in Bash Shell on Macs

    how do i open a PDF file in the bash shell on a mac?
  5. J

    The Time Evolution of an Infinite 3D Grid of Mass Particles

    The Newtonian Shell Theorem makes important predictions about the gravitational force experienced by an object located inside a spherically symetrical massive structure, such as a hollow or solid ball. The same predictions are made by Gauss' Law. According to...
  6. G

    Electrical field outside spherical shell

    Homework Statement An insulated spherical shell with its center in the origin and radius R has a surface charge density of \sigma(\theta)=\sigma_0\sin(\theta) when \theta is the angle from the z axis. Calculate the electrical field outside the shell at point z=R. Homework Equations...
  7. E

    Is there a way to run Emacs in the background from a Linux shell?

    When I open emacs from a linux shell, it always makes it run in the "foreground" so that I cannot do anything else in the shell until I close emacs. I used to know a way around this with some extra command after "$ emacs" but I forgot it. Does anyone know what I am talking about?
  8. S

    Calculate Flight Time of Artillery Shell

    Homework Statement An artillery shell is fired at an angle of 25.3 above the horizontal ground with an initial speed of 1890 m/s. The acceleration of gravity is 9:8 m/s2 : Find the total time of fight of the shell, neglecting air resistance. Answer in units of min. Homework Equations...
  9. N

    Question about electrons per shell

    why is it the maximum electrons per shell is 2,8,18,32,50 ... Wouldn't 2,8,16,32,50 make more sense mathematically? Are there any equations the show why this occurs?
  10. D

    How Do Charges Distribute on a Spherical Conducting Shell with a Central Charge?

    An uncharged spherical conducting shell surrounds a charge -q at the center of the shell. The charges on the inner and outer surfaces of the shell are respectively... For this question I know that the charges are going to be +q, -q respectively. However, what if the center charge wasn't...
  11. F

    Shell method versus disk method

    I'm confused when to use the shell method vs. the disk method Specifically in this problem: If the region encolsed by the y-axis, the line y=2 and the curve y=\sqrt{x} is revolved around the y-axis, the volume of the solid generated is: However when I use the shell method and the disk...
  12. E

    Electric Field due to a charged conducting finite cylindrical shell.

    Hi everyone. I'm having a bit of trouble with finding an electric field. Basically, I'm trying to understand the formula for a cylindrical capacitor, so the method involves integrating the field between two conducting cylindrical shells. Firstly can Gauss's law be used in this case, because the...
  13. E

    Calculating EMF from Rotating Spherical Shell in a Magnetic Field

    Homework Statement A perfectly conducting spherical shell of radius 'a' rotates about the z-axis with angular velocity \omega in a uniform magnetic field \mathbf{B} = B_0 \hat{\mathbf{z}}. Calculate the emf developed between the "north pole" and the equator.Homework Equations The Attempt at a...
  14. P

    How Can A Be Calculated for Uniform Electric Field in a Spherical Shell?

    Homework Statement (Note: Don't worry about significant digits. I just want to be able to do the question and will worry about significant digits on the exam.) In the figure below, a non-conducting spherical shell of inner radius a=2.00cm and outer radius b=2.40cm has (within its...
  15. pellman

    4-velocity, the mass shell and potential energy

    4-velocity, the "mass shell" and potential energy For a free relativistic particle we have the condition E^2-\mathbf{p}^2c^2=m^2c^4. putting p^0 = c^{-1}E we may write this as p^\mu p_\mu = m^2c^2 And since p^\mu = m\frac{dx^\mu}{d\tau} = mu^\mu we may express the same condition as...
  16. T

    Field of long cylindrical shell conductor

    [SOLVED] Field of long cylindrical shell conductor Homework Statement Shown above is the cross-section of a long cylindrical shell conductor of inner radius a=4.00 cm and outer radius b=7.00 cm which carries a current into the page. The current density J (current/area) is uniform across the...
  17. B

    Trajectory of an exploding shell

    A 36-kg shell is fired from a gun with a muzzle velocity 185 m/s at 59 degrees above the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass. One fragment, whose speed immediately after the explosion is zero, falls vertically. What is the horizontal...
  18. M

    Gun and Shell: Calculate Velocity and Force

    Homework Statement A gun of mass 500Kg fires a shell of mass 2Kg with a muzzle velocity of 500m/s. Calculate: i) the velocity of recoil of the gun ii) the force required to stop the gun in a distance of 0.25m Homework Equations The Attempt at a Solution i)I got the velocity of...
  19. B

    Who Introduced NCSM and When Was It Introduced?

    Can anyone tell me who introduced the NCSM and what year was it introduced?
  20. W

    Electric potential and field of a thick spherical shell

    Question: I have a thick spherical shell (inner radius a and outer b) with charge density = kr^2. I need to find the field and potential at all points in space and calculate the energy. Is it possible to take the equation for the electric field of a solid sphere, and integrate from a to b? Or...
  21. A

    Magnetic Moment of a spinning shell

    The problem reads: Find the magnetic moment of a spinning shell of charge Q, radius R, and angular velocity \vec{\omega}. My solution: I split the sphere into infinitely small loops of current (from top to bottom) and add them up. I set my origin on the center of the sphere and...
  22. T

    Calculating Christoffel symbols for a spherical shell in 2-space

    Hello everybody, this is my first post here. I need help with a task in General Relativity. ------- Given we have a spherical shell in 2-space of radius \rho. With the line element: ds^{2} = g_{ab} dx^{a}dx^{b} = \rho d \theta^{2} + \rho^2 sin^2(\theta) d \phi^2 (a,b \in 1,2) Then...
  23. F

    Potential Difference in spherical shell

    Homework Statement Figure 16.69 A thin spherical shell made of plastic carries a uniformly distributed negative charge -7e-10 coulombs (indicated as -Q1 in the diagram). Two large thin disks made of glass carry uniformly distributed positive and negative charges 1.7e-05 coulombs and...
  24. M

    Charges on an Outer & Inner Shell w/ -5.0E-6C Center

    A shell with a charge of -5.0E-6 C at the center. What will the charge be on the inner surface of the shell? The outer?
  25. W

    Possible Configurations for the First Excited State in 17-F-9

    I am confused how to determine the spin / parity of excited states. In my textbook, one of the questions states: ------------------------------ The ground state of the radioisotope 17-F-9 has spin-parity j_P = (5/2)+ and the first excited state has j_P=(1/2)-. Suggest two possible...
  26. W

    Nuclear Shell Model - Spin-parity

    I am confused how to determine the spin / parity of excited states. In my textbook, one of the questions states: ------------------------------ The ground state of the radioisotope 17-F-9 has spin-parity j_P = (5/2)+ and the first excited state has j_P=(1/2)-. Suggest two possible...
  27. A

    Moment of inertia of a thin spherical shell

    Can anyone help me how to calculate the moment of inertia of a thin spherical shell? Thank you
  28. H

    Electric Field at Point P on Spherical Shell Insulator

    Homework Statement An insulator in the shape of a spherical shell is shown. The insulator is defined by an inner radius a = 4 cm and an outer radius b = 6 cm and carries a total charge of Q = +9 microC. You may assume that the charge is distributed uniformly throughout the volume of the...
  29. S

    Potential/self energy of a charged spherical shell

    What is the potential energy of a uniformly charged spherical shell; i think it is called the self energy of shell.
  30. E

    A Conducting Shell around a Conducting Rod

    Homework Statement An infinitely long conducting cylindrical rod with a positive charge "lambda" per unit length is surrounded by a conducting cylindrical shell (which is also infinitely long) with a charge per unit length of "-2 lambda" and radius r1. a) What is E(r) , the radial...
  31. P

    Volume of Rotated Function: Shell Method for y=1/x on [1,4]

    Homework Statement Find the volume of the function rotated about the x-axis over the given interval: y=1/x on interval [1,4] for this specific problem it says to sketch the region and express as a sum of two integrals. Homework Equations The Attempt at a Solution I'm not sure why you...
  32. M

    Why is the E field at 1m zero inside a shell with distributed charge?

    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...
  33. S

    How to Load a .py File in the Python Interactive Shell for Debugging?

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

    Calculating Acceleration of a Spherical Shell

    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...
  35. S

    Calculating Time of Flight for Artillery Shell

    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!
  36. M

    Does Thermal Expansion Affect the Enclosed Volume or the Shell Material Volume?

    [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...
  37. S

    Hi Help with shell balance

    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!
  38. malawi_glenn

    Finding AGB Star Phases: Modeling S-Process in a Helium Shell Burning Region

    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...
  39. K

    Moment of inertia of spherical shell problem

    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...
  40. Y

    Electric Field in center of half spherical shell

    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...
  41. C

    An artillery shell is fired I don't know

    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...
  42. P

    Projectile motion of cannon shell

    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...
  43. S

    Fixed-Tube-Sheet Shell and tube Heat Exchanger

    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...
  44. O

    Solving Shell Explosion: Find v2 & v3, Sketch Velocities

    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...
  45. O

    Calculating Momentum of Gun-Fired Shell

    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...
  46. M

    Insulating spherical shell - E Force on a rod

    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...
  47. W

    Electric Field of an Insulating Cylindrical Shell

    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...
  48. M

    What is the net charge on the hollow conducting sphere?

    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...
  49. B

    Electronic structure - Outer shell

    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?
  50. A

    Calculating the Gravitational Potential of a Spehrical Shell

    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...
Back
Top