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. J

    Electric Field due to Shell Hemisphere

    Homework Statement Calculate the Electric Field generated by a hemisphere of radius ##R## (and uniform charge density ##\sigma##) at its center. Homework Equations ##\displaystyle E = \frac{Q}{4\pi \varepsilon_0 r^2}## The Attempt at a Solution I think I'm doing some mistakes with the...
  2. R

    Caltex Capella 68 or Shell Calvus 68

    Please let me know which one of the above oils is best for ammonia refrigeration systems.Currently we are using Shell Calvus 68 and we experienced oil carry over to the evaporators.Now we are trying to move on to Caltex Capella 68.please convince me which one would be the best...Thanks
  3. U

    Charge inside and outside conducting shell

    Homework Statement A thin metallic spherical shell contains a charge Q over it. point charge +q is placed in side the shell at point T separated from the centre by a distance a. Another point charge q1 is placed outside the shell at a distance b from the centre find the electric field at the...
  4. WannabeNewton

    Frame dragging slowly rotating shell

    I was given a problem recently that I had to solve and I haven't been able to get a fully satisfactory conceptual grasp of a certain aspect of it. Consider the slowly rotating Kerr solution ##ds^2 = -\alpha^2 dt^2 + \alpha^{-2}dr^2 + r^2d\Omega^2 - \frac{4Ma}{r}\sin^2\theta dt d\phi + O(a^2)##...
  5. J

    Hydraulic cylinder (Shell) stresses

    Hello guys, this is my first time here take an apology if I choose wrong section of forum. I just want to know should in shell of double-acting hydraulic cylinder (as in hydraulic presses ) should longitudinal/axis stress be analyzed beside radial and Circumferential/hoop stress and take in...
  6. Alettix

    Potential of a Spherical Shell

    Hi! I have trouble with solving this problem and would be really thankful for some help. :) 1. Homework Statement Inside a thin, spherical metal-shell with a radius of 50 cm, a smaller homogenous metal-sphere with a radius of 20 cm is placed concentrically. The smal sphere is grounded through...
  7. Hardik Batra

    Electric flux linked with spherical shell having a hole?

    How much electric flux linked with the spherical shell having a hole?(consider the charge is outside the shell) I knew the flux linked with spherical shell is zero.(because it is closed loop.)
  8. F

    What is the electric potential on this conducting shell?

    Homework Statement If you have a conducting shell with charge Q surrounding a conducting sphere of charge negative - Q, what is the potential at the outside of the conducting shell? What about the inside? Homework Equations V=(kQenclosed)/r The Attempt at a Solution I don't know if the above...
  9. F

    Using nuclear shell model to determine parity and spin

    Homework Statement Use the shell model to determine the parity and spin assignments for all the stable isotopes of calcium. Homework Equations n/a The Attempt at a Solution The stable isotopes seem to be 40Ca, 42Ca, 43Ca, 44Ca, 46Ca, and 48Ca I believe all of those isotopes except 43Ca are...
  10. M

    Electric field of a non-conducting shell

    Homework Statement Not sure if I'm doing this problem correctly (no answer key for these practice problems). I just want to check with people that know this material well enough. A hollow spherical non-conducting shell of inner radius a and outer radius b carries charge density p = C/r^2 in...
  11. R

    Resistivity of two copper wires using valence shell information

    Homework Statement Homework Equations Please see below. The Attempt at a Solution From my thread in the Solid State section (and input from DrDu): The Thomas-Fermi wavevector relates to the damping of an electric field caused by build up of carriers around an impurity (screening). Where...
  12. Estefania_8

    Potential of a Charged Spherical Shell

    Homework Statement A hollow spherical conductor, carrying a net charge +Q = 47 pC, has inner radius r1 = 5.9 cm and outer radius r2 = 11.9 cm. At the center of the sphere is a point charge +Q/2. a. Find the potential at r = 18.0 cm. b. Find the potential at r = 10.0 cm. c. Find the potential...
  13. Alex_Neof

    Infinitely long cylindrical shell (magnetic field at centre)

    Homework Statement An infinitely long hollow cylinder of radius (a) carries a constant current (i). Use Biot - Savart's law and show that the magnetic field at the centre of the cylinder is zero. Also show, using symmetry arguments and Ampere's law, the magnetic field is zero in any point...
  14. U

    Shell Structure in Atomic Nucleus

    Homework Statement (a) What shows the existence of shell structure? What are the other numbers? (b) Deduce the spin and parities. Homework EquationsThe Attempt at a Solution The shell model is given by: So for Li, 3 protons pair up with 3 neutrons, leaving an unpaired neutron in...
  15. J

    Charge inside of Conducting Shell

    Homework Statement A positive point charge q is located inside a neutral hollow spherical conducting shell. The shell has inner radius a and outer radius b; b − a is not negligible. The shell is centered on the origin. Assume that the point charge q is located at the origin in the very center...
  16. SIMON1

    What is the Equation for Determining the Resonant Frequency of a Drum Shell?

    Hi there I am currently doing a major thesis on the procedural generation of an acoustic drum kit, using PD (puredata). Now what I am actually doing is physically modelling the drum kit piece by piece, starting with the drum shell. I know that every aspect of the drum contributes to its complex...
  17. sk1105

    Nuclear Shell Model - pp bound states?

    I have looked around for help with this, including on existing threads, but I can't quite find what I'm looking for. I know that in the nuclear shell model we fill the shells in the same way as with electrons, so 2 protons in the first and 6 in the second etc, with the same being true for...
  18. N

    Why do Electrons "want" 8 Electrons on the outter "shell"

    Why do Electrons "want" 8 Electrons on the outter "shell"? What is so special about 8?
  19. N

    Cylindrical Charge distribution with dielectric shell

    Homework Statement A cylindrical distribution of charge ρ = α/sqrt(r) where α = 2 µC/m^(5/2) extends from 0 cm to 9.3 cm (has radius 9.3 cm). Concentric with this is a dielectric shell with k = 5.44 of inner radius 16.6 cm and outer radius 24.9 cm. What is the electric field at 3.53 cm, 12.6...
  20. D

    Finding electric field of spherical shell

    Homework Statement So, probably a general question for most of all. It states that there is a charged insulating spherical shell with an inner radius of a/4 (a cavity) and an outer radius of a. The outer shell has a non-constant volume charge density of ρ=(-8α(r^2)). I need to find the electric...
  21. R

    Calculating the Electric Field inside an insulating shell

    Homework Statement We are asked to calculate the electric field inside of the a spherical insulating shell with an inner radius of 10cm and an outer radius of 20 cm and a charge density of 80 uC/M^3. Additionally, a +8uC charge is added to the center of the shell.Homework Equations Gauss's...
  22. S

    Angular momentum of a thin spherical shell

    Homework Statement [/B] A thin spherical shell of radius R = 0.50 m and mass 15 kg rotates about the z-axis through its center and parallel to its axis. When the angular velocity is 5.0 rad/s, its angular momentum (in kg ⋅ m2/s) is approximately: a . 15 b. 9.0 c. 12 d. 19 e. 25 Homework...
  23. R

    Electric Field above a cylindrical shell w/ charge density

    Homework Statement [/B] We need to use the equation for the E field of a ring to set up the integral for calculating the E field of a cylindrical shell with a charge density of σ and a radius of R and a height of H, at a point P that is D distance away from the cylinder.Homework Equations [/B]...
  24. KleZMeR

    Work done moving a test charge into conducting shell

    Homework Statement Ok, so I've read many of the threads on here and they all say the same thing. I think I understand the Gauss Law and the theory behind the spherical shell. The question is this: Find the WORK done bringing a test charge q from infinity to the center of a spherical shell of...
  25. Pull and Twist

    MHB Need Help: Volume of Ellipse Rotated at X=-2 Using the Shell Method

    The question is... So of course I rearrange my ellipse formula to get y=\pm\sqrt{1-\frac{{x}^{2}}{4}} Then I calculate my radius as x-(-2)=r \implies x+2=r I know the formula for finding volume with the Shell Method is V=\int_{a}^{b}2\pi x\cdot f(x) \,dx To make it easier I decide to just...
  26. T

    Find potential of a ball inside a grounded shell

    I have this question that initially a metal ball of radius r1 with potential v1, then surrounded by a conducting shell with radius r2. Find potential of ball if shell grounded. So v1 =kq/r1, then q=vr1/k, can I say directly that shell will have -q since it's induced by ball? Then v ball will be...
  27. P

    What is the Acceleration of a Spherical Shell Filled with Fluid on an Incline?

    Homework Statement A spherical shell of mass M and radius R is completely filled with a frictionless fluid, also of mass M. It is released from rest, and then it rolls without slipping down an incline that makes an angle θ with the horizontal. What will be the acceleration of the shell down the...
  28. M

    Is Fluid Mixing/Seepage Limit a Crucial Specification for Heat Exchangers?

    Is there some specification in manufacturer's literature or some standards about limit of fluid mixing/ seepage through tubesheet of any particular heat exchanger. Is this an important parameter of specification or it does not matter in every application. If such parameter exist, what is its...
  29. mrspeedybob

    Question about gravity and the shell theorem

    Consider a point in the universe I'll call X and a test particle some distance R away. For the purposes of calculating the gravitational acceleration of the test particle I'll consider all the matter within radius R of point X to be a point mass attracting the particle to X. Furthermore, all the...
  30. E

    Electric Potential with Non-conducting sphere and conducting shell

    Homework Statement A spherical nonconductor of radius a carries charge +Q uniformly spread through its volume. 2 hemispherical conducting shells of inner radius b and outer radius c are placed concentrically with the nonconducting sphere to form a single conducting sphere. The conducting shell...
  31. E

    Proper way to graph xy = 1 for a cylindrical shell problem

    Homework Statement Proper way to graph xy = 1 for a Cylindrical Shell problems. Homework Equations V = ∫^b_a 2πy f(y) dy The Attempt at a Solution I am rotating around the x-axis, so I am integrating with respect to y, but should I choose x = 1/y, or y = 1/x to solve my problem? How are...
  32. H

    Solving Electrostatic Potential of a Spherical Conducting Shell

    Homework Statement A spherical conducting shell of radius R is held at a potential V0. Outside the shell, the charge density is ρ(r) = ρ0sinθcosφ for R < r < 2R. Find the electrostatic potential everywhere outside the shell. Homework Equations Green's function in spherical coordinates between...
  33. A

    Potential of Spherical Shell with Nonunifor Surface Charge

    Homework Statement A thin spherical shell of radius R carries a surface charge density of the form kcos 3 θ . Find the electric field inside and outside the sphere and demonstrate explicitly that its components satisfy the relevant boundary conditions at the surface Homework Equations The...
  34. A

    Non-Uniform Surface Charge Spherical Shell

    Homework Statement A thin spherical shell of radius R carries a surface charge density of the form kcos3 \theta Find the electric field inside and outside the sphere and demonstrate explicitly that its components satisfy the relevant boundary conditions at the surface. Homework Equations...
  35. R

    Potential of concentric cylindrical insulator & conducting shell. Stuck on 2nd question

    An infinitely long solid insulating cylinder of radius a = 5.2 cm is positioned with its symmetry axis along the z-axis as shown. The cylinder is uniformly charged with a charge density ρ = 23 μC/m3. Concentric with the cylinder is a cylindrical conducting shell of inner radius b = 14.2 cm, and...
  36. A

    Conductor with shell problem getting zero as answer?

    1. Problem Statement: The figure shows a cross-section view of a very long cylindrical cable. There is an outer tube made of copper, inner radius 2R, outer radius 4R. The inner copper wire has radius R and is concentric with the tube. The inner wire has charge density –2λ (per unit length)...
  37. Vannay

    Does the valance shell determine overall electron charge distribution?

    I'm going over the Physics GRE and this question has me a little confused. The configuration of the potassium atom in its ground state is 1s2 2s2 2p6 3s2 3p6 4s1. The answer to which of the following is true is this statement: "Its electron charge distribution is spherically symmetrical." Is...
  38. M

    Electric field of point charge within spherical shell.

    If there was a spherical shell with negative charge density and a positive point charge inside the shell, the electric field lines from the point charge would just be radially outward towards the shell right? What about the case where there's a positive charge density and a positive point...
  39. T

    Thick spherical shell Question.

    Homework Statement A thick spherical shell with inner radius R and outer radius S has a uniform charge density d.(A) What is the total charge on the shell? Express your answer in terms of R, S, d, and π. (B) Express the electric field as a function of distance from the center of the sphere r...
  40. P

    Gauss's Law with a Insulating Shell

    Homework Statement An insulator in the shape of a spherical shell is shown in cross-section above. 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 μC(You may assume that the charge is distributed uniformly throughout the...
  41. M

    Using shell method to find the volume of a solid

    Homework Statement Use the shell method to find the volume of the solid generated by revolving the region bounded by the line y=2x+15 and the parabola y=x2 about the following lines: a) The line x=5 b) The line x= -3 c) The x-axis d) The line y=25 Note: leave answer in terms...
  42. T

    Heat diffusion in a spherical shell

    Hey guys, I have a problem that is giving me trouble. Homework Statement I have to solve time dependent diffusion equation ##D\nabla^2 T(r,t)=\frac{\partial T}{\partial t}## (##D## is diffusion constant and ##T(r,t)## is temperature function) for a spherical shell of radii ##r_1## and ##r_2##...
  43. T

    Volume by washer or shell help

    Homework Statement Find the area given by y=x^2, y=4, x=0 and revolved about y = -2 Use either the washer or shell methodHomework Equations Shell; integral from a to b of 2∏x(f(x))dx The Attempt at a Solution Alright so I tried to do this is terms of dy so since we are revolving about y=-2...
  44. D

    A shell is fired vertically upwards

    A shell is fired vertically upwards with a velocity of v1 from a ship moving with a velocity v2, a person on the shore finds the motion of the shell parabola. Show that the horizontal range is 2v1v2/g
  45. Adithyan

    Electric potential of a charged shell- Self potential?

    Homework Statement I recently encountered a problem wherein I was asked to calculate the potential difference between two non conducting concentric spherical shells of radii R1 and R2. Homework Equations ΔV=-∫E.dr The Attempt at a Solution While I was able to calculate the potentials of...
  46. T

    "Potential of Concentric Cylindrical Insulator and Conducting Shell"

    Homework Statement An infinitely long solid insulating cylinder of radius a = 2.5 cm is positioned with its symmetry axis along the z-axis as shown. The cylinder is uniformly charged with a charge density ρ = 30 μC/m3. Concentric with the cylinder is a cylindrical conducting shell of...
  47. M

    Are shell electrons accompanied by virtual neutrinos?

    Hi everyone, This is my first post. Years ago I read in a science magazine that (at least according to a certain theory) every shell electron would be accompanied by one (or was it two?) virtual neutrino(s). At least that's my recollection of what I read. I know it sounds a little crazy. I...
  48. J

    Net gravitational force inside a shell

    When I was in introductory physics I remember being told that the net force (gravitational for example) inside a shell is always 0. I always felt that, intuitively, this would only be true at the center of the ring. Not sure what made me think of it today, by I decided to sit down and do the...
  49. B

    Is the Shell Theorem Valid for Both Solid and Hollow Spheres?

    Hi, I found this derivation at wiki: http://en.wikipedia.org/wiki/Shell_theorem Can someone tell me if the theorem is valid only for a solid sphere , or the pull of a hollow sphere is exacly the same it would be if all the masse where at the center wrt to a mass at any distance D from the...
  50. V

    Uncharged spherical conducting shell

    An uncharged spherical conducting shell surrounds charge -q at the center of the shell. Then a charge+ +3q is placed on the outside of the shell. When static equilibrium is reached, the charges on the inner and outer surfaces of the she are respecteively... +q,-q is the answer. Does the +3q...
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