Radial Definition and 481 Threads

The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a "star engine" in some languages (German Sternmotor, French moteur en étoile, Japanese 星型エンジン (hoshigata enjin), Italian motore stellare). The radial configuration was commonly used for aircraft engines before gas turbine engines became predominant.

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  1. Q

    Direction of radial acceleration

    I have a big confusion. There is a question in my book which basically says that a ball is tied to a string and rotated. and it asks me to tell whether the following statement is true of false. Direction of radial acceleration MAY remain the same. This statement is true. Please explain to me a...
  2. EverGreen1231

    Question on the differentiation between a Network line from Radial

    I have been told that if the line connects breaker to breaker, it is considered to be radial; but, this doesn't make sense to me. If a line is connected by two feeders then there would be two sources of power, hence "Radial". I'm not sure if I'm missing some minute detail that makes the whole...
  3. Arnoldas

    Distribution of radial velocities in a gas

    The lecturer did not explain this for some reason. Assuming that we have a gass where all the particles have a certain absolute velocity v. Directions of v vector are random though, giving velocity vector a uniform direction distribution. That means that a velocity vector of any random...
  4. stevebd1

    Properties of in-falling radial plungers

    Due to the blogs being removed, I thought it might be worthwhile posting a few in the forums- From 'Exploring Black Holes' by John Wheeler and Edwin Taylor; can apply to any object falling radially towards a static spherical mass (where the mass of the infalling object is much smaller than...
  5. E

    Radial polarization and optical vortex

    hi, What is the difference between radial polarization and optical vortex? thx http://en.wikipedia.org/wiki/Radial_polarization http://en.wikipedia.org/wiki/Optical_vortex http://en.wikipedia.org/wiki/Angular_momentum_of_light http://en.wikipedia.org/wiki/Orbital_angular_momentum_of_light...
  6. H

    Find radial imprint on rotating disk

    This problem came up after drawing a line on the spinning rotor of a food processor. I was idly musing about relativity (parallel motion and perpendicular motion). Maybe some ancient mathematician found the solution while working clay on their potting wheel! Here it is: A flat disk rotates...
  7. matt_crouch

    Lorentz Transform of Radial & Longitudinal Dependent Magnetic Field

    Basically I am trying to lorentz transform the magnetic field along θ of a bunch particles which have a gaussian distribution to the radial electric field. However the magnetic field in θ is dependent on the longitiudinal distribution. Now initially i thought we would just use the standard LT...
  8. J

    Solution to the radial energy equation

    Homework Statement Find the polar equation of the orbit of an isotropic harmonic oscillator by solving the differential equation \frac{J^{2}}{2M}(\frac{dv}{dθ})^{2}\frac{1}{v} + \frac{J^{2}}{2M}v + V(r) = E. And verify that it is an ellipse with centre at the origin. Homework Equations...
  9. E

    Calculating Radial Distance in a Toroidal Coil: Step-by-Step Guide

    Radial Distance In class, I measured the field strength of a toroidal coil at various distances. I used a linear track to move the hall probe along the azimuthal field at certain positions. How do i convert the distance into radial distance if the inner conductor is at radius 2.5 cm?
  10. A

    Centripetal vs Radial acceleration

    I am reading introductory physics from Serway. Where they say if a_r is radial acceleration and a_c is centripetal acceleration then a_c = v^2/r and a_r = -a_c = - v^2/r But aren't the radial and centripetal acceleration same (correct me if I am wrong)? Why is there a minus sign? The...
  11. J

    Hydrogen Radial Equation: Recursion Relation & Laguerre Polynomials

    I'm in the first of 3 courses in quantum mechanics, and we just started chapter 4 of Griffiths. He goes into great detail in most of the solution of the radial equation, except for one part: translating the recursion relation into a form that matches the definition of the Laguerre polynomials...
  12. T

    Radial motion in the Schwarzshild spacetime

    Hello, The following has been confusing my friends and I, I want to make sure I have this clear as it is fairly elementary. (note set c = 1) Ed is falling radially into a black hole, the Schwarzschild metric is: ds2 = (1-2μ/r) dt2 - (1- 2μ/r)-1 dr2 his proper time is dτ2 = (1-2μ/r) dt2 -...
  13. W

    Radial and tangential velocities for Inviscid flow (fluid mechanics)

    After I have an expression for the stream-function in a problem, I can differentiate to get the tangential and radial velocities because I need those to solve the problem. But I don't understand when the tangential velocity will be 0 and when the radial is 0. Can some on explain?
  14. F

    Electrostatic boundary value problem with radial dielectrics

    Homework Statement A unit sphere at the origin contains no free charge or conductors in its interior or on its boundary. It is, however, embedded in a dielectric medium. The dielectric is linear, but the permitivity varies by angle about the origin. It is constant along any radial direction...
  15. M

    Sphere with permanent radial magnetization

    Homework Statement We have a sphere of radius a with permanent magnetization \mathbf{M}=M\hat{e}_{\mathbf{r}}. Find the magnetic scalar potential. Homework Equations $$\Phi_M(\mathbf{x})=-\frac{1}{4\pi}\int_V \frac{\mathbf{\nabla}'\cdot\mathbf{M}(\mathbf{x}')}{|\mathbf{x}-\mathbf{x}'|}d^3...
  16. B

    Radial oscillations of gravitational star

    Consider a spherical star made of N (very large number) particles interacting via gravity.Let the mass of ith particle be mi and position be xi Let ##I= \sum_{i=1}^{N}m_{i}r_{i}##, U be potential energy and K be kinetic energy 1)Show that the virial equation takes the form...
  17. I

    Radial Null Geodesic: Solving the Equation

    Hi, I've found geodesic equations for the metric: \begin{equation} ds^{2} = -c^{2} \alpha dt^{2} + \frac{1}{ \alpha } dr^{2} + d \omega ^{2} \end{equation} where \begin{equation} \alpha = 1 - \frac{r^{2}}{r_{s}^{2}} \end{equation} I have found that for a light ray: \begin{equation}...
  18. M

    Radial component of B field of solenoid

    Hi everyone. I'm having a relatively hard time in understanding Griffith's explanation of why the radial component of a magnetic field of a solenoid should be zero. He says, "If B(r) were positive, if we reversed the direction of the current, B(r) would be negative. But switching I is...
  19. A

    Radial Flow Water Pump-How to calculate Watts required to power it

    Radial Flow Water Pump--How to calculate Watts required to power it Hi all, I'm currently working on an independent project where I'm building a radial flow water pump to be sent to a village in Senegal. I'm having trouble figuring out what motor to use to power this water pump and how much...
  20. M

    Speed in radial coordinates and angular coordinates

    Homework Statement First off, I am not a physics student. I am a math major taking a maple software course and there is a question that I can not figure out. The question gives me a radial coordinates r r:= \frac{a*t^{2}*e^{-b*t}}{1+t^{2}} And angular coordinates: θ:=b+c*t^{2/3} Where...
  21. crador

    What Is the Most Likely Radius for a 1s Electron in a Hydrogen Atom?

    Homework Statement Hey Guys! Here's my problem: ψ=2(Z/a)^3/2*e^ρ/2 for the 1s orbital of a hydrogen atom. Write down the radial distribution function expression (P) of a 1s electron and determine the most likely radius. ρ=2Zr/a Z nuclear charge r radius a Bohr's radius Homework...
  22. U

    To get the complete Radial Wavefunction, why do we multiply by Y(l,m)?

    Hi guys, I'm doing a quantum course at the moment, and there's one thing in Binney's book which I don't really understand: Why must you multiply the radial eigenfunction by ##Y_l^m## to get the "complete wavefunction" ? They do this to normalize the eigenfunction, and to do things like...
  23. C

    Radial distribution function for H atom in ground state

    Homework Statement The normalized energy eigenfunction of the ground state of the hydrogen atom is ##u_{100}(\underline{r}) = C \exp (-r/a_o)##, ##a_o## the Bohr radius. For this state calculate 1)##C## 2)The radial distribution function, the probability that the electron is within a...
  24. P

    Acceleration of mass moving along a radial track.

    Hi, Homework Statement I am trying to determine the magnitude of the acceleration, registered by an observer in the lab, of mass m forced to move along a radial track, immediately as it begins moving along the track. Please see attachment. ω=αt and the entire set up is horizontal. The initial...
  25. L

    Tangential & normal vs radial & transverse

    What is the difference between "tangential and normal components" and "radial and transverse components" ? I mean in both cases, the two components are perpendicular to each other and one of the components causes the particle to rotated around, the other one gives it a speed to rotate with. Is...
  26. D

    About the radial Schrödinger quation

    Dear all, I meet a difficult question as follows: -\frac{1}{ρ^{2}}\frac{d}{dρ}(ρ^{2}\frac{dR_{l}}{dρ})+[\frac{l(l+1)}{ρ^{2}}+V(ρ)]R_{l}(ρ)=ER_{l}(ρ) (1) let x=ln(ρ) and y=ρ^{1/2}R_{l}(ρ) ,then y^{''}=γy...
  27. G

    Radial and transeverse acceleration

    Particle is traveling along a plane smooth curve.At any point an acceleration is 1 . Resultant of radial and transeverse components? 2. Resultant of tangential and normal components? Are both 1 and 2 valid?
  28. M

    Radial vs Tangential acceleration

    I ma having a little bit of trouble distinguishing radial and tangential acceleration. For example: The magnitude of the acceleration of a point on a spinning wheel is increased by a factor of 4 if: A. the magnitudes of the angular velocity and the angular acceleration are each...
  29. lonewolf219

    What is the v(p) polynomial in radial wave function

    I think the solution to the radial schrodinger equation includes a form of the Laguerre polynomials, the polynomial v(ρ). Does anyone know what this v(ρ) polynomial is called? The only information my book gives is: "The polynomial v(ρ) is a function well known to applied mathematicians."...
  30. S

    Radial Dependency of Navarro-Frenk-White profile

    Homework Statement Determine the radial dependence of gas density for an isothermal cluster of galaxies with temperature T that has a total mass density profile given by the Navarro, Frenk, & White form: ρ(r) = ρcδc , (r/rs)(1 + r/rs)2 where ρc is the critical density, rs is a characteristic...
  31. ckirmser

    Proper Motion, Radial Velocity

    Greetings, all. I'm working on a real-time star map for a role-playing game where each star is located in its time-corrected 3d coordinates. With this, each star will be where it should be in a moment of time and not where it is observed to be. To do this, I take the proper motion of the...
  32. J

    Calculating Maximum Force Applied to Shaft with Radial Undercut

    Hello, If I have a shaft that has a section area of .0562 in. sq. and a material yield strength of 60KSI. And I will have the force applied at the top of the shaft pushing down. The shaft will be in a cantilever configuration where the force will be applied .125" from the base of the shaft...
  33. A

    Centrifuge and Radial Bouyancy in space

    Hi all, I want to calculate how tell if a particle in a centrifuge in deep space will move towards the rotation axis or to the rim of the fluid. There is no container walls. This is not a HW problem. I watched the video and wanted to learn more about this. (it is under the you-tube...
  34. J

    Where Can I Buy a Small Radial Inflow Microturbine for a Lab Demonstration?

    Hello, would someone know where could one purchase a radial inflow microturbine of diameter 1 - 2 cm All I need is a contact web address or similar of the manufacturer or seller. Many thanks
  35. P

    Wormhole proper radial distance

    I've been reading the excellent article from Morris and Thorne: "Wormholes in spacetime and their use for interstellar travel a tool for teaching general relativity" and there's something I don't quite get it. In the ninth page the authors state: "[...] in the general case, the radial coordinate...
  36. S

    Simple typo question: Radial & circumferential components of velocity

    Homework Statement Here is the part of the problem that I am referring to (that is also fully portrayed in a more aesthetically-pleasing manner in the TheProblem.jpeg attachment).: Consider a particle moving on the curve whose equation in polar coordinates is r = 1 + cos(θ). The rate of change...
  37. N

    Biot-Savarts law: Off-axis radial field

    Homework Statement Hi I am trying to find the off-axis x-component of the magnetic field produced by a current-carrying coil. The on-axis case is done here, where the axial (z-) field is found and the x-component is of course 0 due to symmetry. I am pretty sure I know how to do it: I end up...
  38. kai_sikorski

    Radial distribution function question

    I've been playing around with some MD simulations, a field not really familiar to me. I put together a code in LAMMPS to simulate a Lennard-Jones fluid and compute the RDF. I get the oscillations one would expect, which is good, but what is surprising is that the minimum of g(r) after the first...
  39. O

    Constant radial and angular velocity; find magnitude of acceleration.

    Homework Statement (a) A particle moves in a plane with constant radial velocity [(r)\dot] and constant angular velocity [θ\dot]. When the particle is at distance r from the origin, determine the speed of the particle. Data: [(r)\dot] = 3.2 m/s; [θ\dot] = 2.3 rad/s; r = 3.2 m. (b) When the...
  40. S

    What factors contribute to the deflection of a galvanometer?

    In a galvanometer the magnetic poles are cut in such a fashion which ensures radial magnetic field. If field is radial then the angle between magnetic moment i.e Area vector of the coil and field is zero. Thus the coil should not experience any torque when current is passed through the coil...
  41. J

    Radial stress in pressure vessels

    Hi all, I have started with my understanding of pressure vessels and i have some queries on the topic. 1) I understand the part of axial stresses.When a cylinder capped at both ends is subjected to internal pressure,it tends to increase the length of the shell,and therefore a resistance is...
  42. D

    Disk radial change with temperature rise

    Hi guys, Heard an interview question from a friend, the guy asked him what happens to a disk with internal radius r and external R such as the following: When heated. He told me the answer is that the internal radius gets smaller and the external gets bigger. Can anyone help me understand why...
  43. F

    Solving the radial Schroedinger equation with a linear potentail

    Homework Statement The problem is number three (page 3) on the following link.http://panda.unm.edu/pandaweb/graduate/prelims/QM_S12.pdf I was going to type it out but it got too messy. 2. The attempt at a solution What I want to know is the relevant unitless variable substitution that...
  44. L

    Coriolis Acceleration: Anti-Clockwise vs Radial Velocity

    http://imgur.com/euMW6FO In the above question, why is coriolis acceleration in the positive eθ direction?. The system is rotating in an anti-clockwise direction, and in the er direction the velocity of the cam is radially outwards. Would this mean that the coriolis acceleration is to the...
  45. S

    What Is the Correct Radial Acceleration for a Spinning Wheel?

    Homework Statement A wheel with a radius of 0.2 m has a constant angular acceleration of α = 3.00 rad/s^2. Find the radial acceleration. Homework Equations arad = ω^2*r ω^2 = ωo^2 + 2*α(θ - θo) → ω = √(2*α*θ) The Attempt at a Solution ω = √6 rad/s → a rad = 6*0.2 m/s^2 = 1.2...
  46. J

    Transient 1D radial conduction

    Morning all, This is probably going to seem absurdly simple, however I need to do a very quick conduction calculation as part of a much larger problem I am working on. I was wondering if anyone would be able to give me some pointers as time is of the essence. The scenario can be simplified as...
  47. O

    Mechanics~polar coordinate & radial and transverse component

    http://www.answers.com/topic/radial-and-transverse-components From the above link, 1) e θ is a unit vector perpendicular to r in the direction of increasing θ. Where is the direction of increasing θ? Is that a circle? θ Increase from 0 to 2∏.then eθ moves in a circle? direction always...
  48. B

    Tangential and radial acceleration

    A ball tied to the end of a string 0.50 m in length swings in a vertical circle under the influence of gravity. When the string makes an angle x= 20 degrees with the vertical, the ball has a speed of 1.5 m/s. Find the magnitude of the radial component of acceleration at this instant. So i have...
  49. tom.stoer

    Radial Schwarzschild geodesics - again

    Suppose there is a radially free falling object starting at r(t=0) = r0 > rS with some initial velocity v. And suppose there is a radial light ray starting at R(t=0) = R0 > r0. Suppose that both the object and the light ray reach the singularity at the same time. Question: is there a simple...
  50. andyrk

    Radial acceleration in uniform circular motion

    Why is there only a radial component of acceleration present if a body is undergoing uniform circular motion whereas in non uniform circular motion both tangential and radial component of acceleration are present?
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