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.
Getting bash shell script to do one thing if user hits "enter".
I need to write a program that will output a line in a calendar file if a date is entered, or if no date is entered and the user just hits "enter" to ouput the line corresponding to today's date.
I think that it must take the...
Hi all
30 students have sent me their answers to me in folders, "name1", "name2", ..., "name30".
Each folder contains 2 outputs, "output_a.txt" and "output_b.txt"
Now I have the correct answer "correct_a.txt" and "correct_b.txt" with me.
I know that using the command diff, I can compare...
Dear reader,
Of course I searched the site to see other persons discussing the the egg shell theory, but I did not find it.
So, perhaps someone can direct me to the subject.
I am interested in the theory that when the universe was created in a big bang, the only part of it is the part we...
Homework Statement
A coastal defence cannon fires a shell horizontally from the top of a 50.0m high cliff directed out to sea with a velocity of 60.0m/s.
Determine the range of the shell's trajectory.Homework Equations
delta x = ut (horizontally)
delta y = ut + 1/2 at^2
The Attempt at a...
Hi all
I badly need some help...
I plot a file output1.txt in the following way ::
gnuplot> plot "output1.txt" using 1:2 with lines, \
plot "output1.txt" using 1:3 with lines
BUT now I have many data files,
output1.txt, output2.txt, output3.txt, ...,... ,output1000.txt
I need to...
a cannon is placed on an edge of a cliff and launches shell with an initial velocity of 710m/s [35degrees above the horizontal]. the shell lands 15m below its launching position.
a) determine the max height of the shell
b) determine the horizontal range of the shell from the base of the cliff...
A shell of mass 0.4 kg is at rest in a gravity-free environment when it suddenly explodes into three fragments. The mass and x,y components of two of the fragments is given in the table:particle mass (kg) vx (m/s) vy (m/s)
[1] 0.12 25 58
[2]...
Homework Statement
A spherical shell of inner radius a and outer radius b contains a uniform charge density ρ of total charge Q. (a) Find ρ (b) find the electric field for r< a, a< r< b, b< r sketch it
Homework Equations
E = kQ/r2
V=4πr3
The Attempt at a Solution
ρ π...
Homework Statement
Use a shell balance method to derive the equation governing the two dimensional temperature distribution,u, in a circular disk in polar coordinate system(r,theta). allow for the possibility of differing thermal conductivities in the r and theta directions.
Homework...
Hi, I received this question on my exam today and it stumped me...
Conducting spherical shell of inner radius 0.045m and outer radius 0.18m, which has a net charge of zero.
A charge Q of 5.5x10-5 is placed at the center, find the electric fields at point A (0.03m), point B (0.06m), and...
So there are two theorems:
1. A shell of uniform charge attracts or repels a charged particle that is outside the shell as if all the shell's charge were concentrated at its center.
2. If a charged particle is located inside a shell of uniform charge, there is no net electrostatic force on...
Homework Statement
Use the shell method to set up and evaluate the integral that gives the volume of the solid generated by revolving the plane region about the y-axis.
y=4x-x^{2} , y=4 , x=0
Homework Equations
V=2\pi\int p(x)h(x)
from a to b
The Attempt at a Solution...
1. Find the electric potential inside and outside a uniformly charged sphere of radius R, and whose total charge is q. Use infinity as your reference point. Compute the gradient of V in each region and check that it yields the correct field. Sketch V(r).
2. I used the theorem that electric...
Homework Statement
Calculate the electric field, E, for general points inside a shell which has a radius R. It also has a uniform surface charge density, σ.
First, do it with Gauss’s Law.
Then find E more directly. Hint: Use Law of Cosines and a substitution.
Homework Equations...
Homework Statement
Moment of inertia of spherical shell of radius R, mass M along its rotation axis is given by \frac{2}{3}MR^{2}
I am trying to calculate thisHomework Equations
The Attempt at a Solution
This is my attempt but is unsuccessful,
since the spherical shell is an assembly of rings...
Potential of Concentric Cylindrical Insulator and Conducting Shell...Please Help
Homework Statement
An infinitely long solid insulating cylinder of radius a = 3.6 cm is positioned with its symmetry axis along the z-axis as shown. The cylinder is uniformly charged with a charge density ρ =...
Homework Statement
The area between the y-axis and the line y = x + 1 from y = 2 to
y = 4 is rotated about the x-axis. Use the shell method to find the
area of the resulting solid.
Homework Equations
V = 2pi integral (radius)(height of shell) dx or dy
The Attempt at a...
Homework Statement
1. Homework Statement
An infinite line of charge with linear density λ = 7.5 μC/m is positioned along the axis of a thick insulating shell of inner radius a = 2.9 cm and outer radius b = 4.9 cm. The insulating shell is uniformly charged with a volume density of ρ =...
Homework Statement
An infinite line of charge with linear density λ = 7.5 μC/m is positioned along the axis of a thick insulating shell of inner radius a = 2.9 cm and outer radius b = 4.9 cm. The insulating shell is uniformly charged with a volume density of ρ = -612 μC/m3.
What is λ2...
Homework Statement
There is a Charged metal sphere with radius b placed inside the central of a ground metallic shell with a radius a. What will be the work done in bring a small positive charge q from infinity to the surface of the inner sphere?
Homework Equations...
If a charge is placed inside a spherical conducting shell, is the total electric field inside it zero? I am thinking that if the charge is positive, then the conducting shell will have an equal amount of negative charge on its inner surface, therefore the E field should be zero inside, right?
i have a hemispherical shell with a radius of R ,and which has V=V0 potential on it. the main problem is i have to find the potential inside the shell for every (r,\theta,\phi) points.
1. I think the potential will depent on only the distance from origin, there won't be any \theta or \phi...
In quantum renormalization, one distinguishes between the (unobservable) bare electron and the observable properties. The justifications that I can find for the procedure seem to rest purely on mathematical and empirical grounds: the methods are in line with a consistent mathematical theory...
Let's suppose that we have two point particles with masses m1,m2 and the spherical shell with mass M, placed in a line, at distances h1,h2 and H from 0 in that line (0 is the center of some inertial frame of reference). The initial conditions and the equations of motion are the following...
Let's suppose that we have two point particles with masses m1,m2 and the spherical shell with mass M, placed in a line, at distances h1,h2 and H from 0 in that line (0 is the center of some inertial frame of reference). The initial conditions and the equations of motion are the following...
Spherically symmetric infinitesimally thin shells
can be described via the well known junction formalism of Israel.
Let us consider such shell in vacuum,
this means that on both sides of the shell we have Schwarzschild spacetimes.
One of the dynamical equations is the first component of the...
Hi everybody,
The framework of infitesimally thin shells
is the well known Israel junction formalism.
Let us suppose motion of a thin in Schwarzschild spacetime.
I mean both side of the shell is desribed by Schwarzschild metric.
Let us suppose that the shell consists non-massless...
Spherically symmetric infinitesimally thin shells
can be described via the well known junction formalism of Israel.
The equation of motion of thin shells is (G=c=1):
(dr/dtau)^2 = (mg/mr)^2 - 1 + (2mc+mg)/r + (mr/2r)^2
This is an energy balance equation,
where r is the...
Shell Side Fluid Velocity of Baffled HX & Re -- Nobody knows last resort
Problem:
I need to know how to calculate the shell side fluid velocity for a Shell&Tube HX with *Baffles*. Also, the reynolds number for this flow
Known:
ms -Mass flow on shell side
Nt -Number of tubes
Lt -Length of...
hello guyz i have some questions about shell and tube exchangers
1- what's the difference between shell and tube exchanger over the plate exchanger ??
2- what's the data required for selecting heat exchanger ??
3- if i will replace the shell and tube with a plate exchanger what's the...
Homework Statement
An uncharged hollow conducting spherical shell with inner and outer radii a,b respectively
is placed into otherwise uniform electric field E. Calculate the induced charge density at a and b and electric field everywhere
Solution for E ,r>b
E = E_0...
I am trying to explain nuclear energy levels in terms of Shell model and I hope that you guys would assist me through this-
1. The potential which exists inside the nucleus is assumed to be harmonic oscillator potential and it's value is obviously given by V(r)=\frac{1}{2}m\omega ^2r^2 However...
I've been philosophing about Newtons shell theorem, which tell us that inside a symmetrical sphere, gravity is zero if the sphere is hollow, and linearly declining while moving closer to the center if the sphere is massive and of constant density.
Now, if the sphere was hollow it would...
Homework Statement
How do 5 protons fill a g9/2 shell in the shell model?
There are 10 spots in the g9/2 shell.
Homework Equations
The Attempt at a Solution
Pauli principle dictates the first four to be in anti-parallel pairs. But the last can be either up or down. Am I missing...
I've got the probem with determination the formula of inductance in the toroidal coil.
This coil has a shape of toroidal shell (like one torus inside the second).
1 torus: (x-R0)^2-y^2=r1^2
2 torus: (x-R0)^2-y^2=r2^2
The shell is a magnetic material with given permeability "ur".
The...
i am having trouble with finding inductance and capacitance of a cylindrical shell with gap.
say inner radius is a, outer radius is b, and filling dielectric between a and b,
and its not a exact circle which have a small gap say d. its like a split ring but only one shell.
How can i...
Last week there was a documentary program on Nat Geo I believe having to do with the composition and origins of comets. The narrative seemed to imply that comets originate within & are rather randomly dislodged from a spherical shell around the Solar System called the Oort cloud. This...
Homework Statement
http://img685.imageshack.us/img685/9501/10953060.png"
Homework Equations
The Attempt at a Solution
I know you use Gauss' Law, but why wouldn't the charges outside of the shell induce a charge on the shell, which would then affect the field at P?
Suppose a solid insulating sphere of radius a carries a net positive charge uniformly distributed throughout its volume. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere. Determine the induced charge per unit area on the outer surface of the...
Homework Statement
I have a question about an upper-division E&M HW
problem I'm stuck on. Any help would be GREATLY APPRECIATED!
Problem Statement:
An insulating spherical shell of radius R was set up to have a potential
on its surface of V=A*cos^2(theta), where A is a constant...
Hello. I am preparing for the AP Physics C E&M exam, and I am trying to understand the solution to 2004-1
The problem provides an infinite line of uniform charge per unit length enclosed within an infinite hollow conducting cylinder with a fixed radius and no net charge. The line of charge...
I have seen the derivation for the formula:
h2(pi)rdr used in math textbooks. However, earlier today I had a physics problem where I needed to use the volume of a cylindrical shell of inner radius r and outer radius dr+r and length h. without remembering the formula I tried to derive it...
Hello;
I couldn't find the answer to this anywhere, so I thought that I might ask here instead. What are the electron shell capacities for any given element? I think that any elements that are arranged in GROUPS have electron capacities that follow the pattern; 2,8,8,18,18,32,32... is this...
Homework Statement
Єr = 3.0, atomic density = 1028 atoms/m3. The mag. of the E-field is 10,000 [V/m]. Two electrons in outer orbital shell will distort with an applied E-field. If both both electrons follow some orbital path as a pair, find spacing between center of nucleus and average...
before i start i wanted to make it clear that this is NOT homework. its just a quick question which puzzled me and my friend
In the shell model of the nucleus. i found a statement that said that since both neutrons and protons are fermions, there are restricted to 2 of each at each energy...
spherical shell rolls down a ramp with friction--time?
Homework Statement
A 120 g basketball has a 25.7 cm diameter and may be approximated as a thin spherical
shell.
Starting from rest, how long will it take a basketball to roll without slipping 6.29 m down an incline that makes an angle of...
Homework Statement
I have a simple question.
There is positive point charge in the center of a sphere 2.5 micro c. The spherical shell has inner radius of 60 cm and outer radius of 90 cm. The net charge of the spherical shell is equal to zero.
Homework Equations
The...
I was wondering if anyone could help me with the following question, please:
A thin walled pressure vessel is to be used as a pressure accumulator in a number of situations all involving a number of different operation conditions some of which create cyclic stresses. The dimentions of the...