What is Radial: Definition and 481 Discussions

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. J

    Hard disk radial distribution function

    Hi, i am running a hard disks molecular dynamics simulation. I would like to compare the radial distribution function obtained from my simulation with the theoretical radial distribution function. May i know what is the theoretical radial distribution function? Or what data do people normally...
  2. Femme_physics

    Is radial acceleration and centripetal acceleration the same thing?

    In uniform circular motion, Is radial acceleration and centripetal acceleration the same thing? Just a vector pointing towards the center? i.e. a synonym?
  3. M

    Finding the Radial Velocity Component of a Point P with Given Velocity Vector v

    Hi there, I'm really ashamed of doing this stupid question but I really need help with this thing. And, even if it's simple, it's not homework. I have a point P=(x,y,z) with velocity v=(vx,vy,vz) how can I determine the radial component of the velocity? My answer is that...
  4. N

    Central Force (period of revolution and period of small radial oscillations)

    [b]1. A particle of mass m and angular moment L moves in a central force V=(1/2)kr^2 (k>0). Find the period of revolution for the circular movement and the period of small radial oscillations around the stable cicular orbit. Homework Equations The Attempt at a Solution Well I tried...
  5. P

    Radial equation for atoms that are not hydrogen?

    So I've seen radial equations for Hydrogen out there (eg http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/hydrad.html), where can I find one for more any arbitrary atom? admitedly, I realize that the equations become more and more complicated the larger the atom is. This is especially...
  6. B

    Equal Inclination of Radial Forces from Point P

    Homework Statement From a point P, within a circle whose centre is fixed straight lines PA1, PA2, PA3 and PA4 are drawn to meet the circumference all being equally inclined to the radius through P; show that if these lines represent forces radiating from P, their resultant is independent of...
  7. R

    Does radial velocity affect centripetal force

    If for example someone is walking along a radial line of a spinning disc at constant velocity would they experience a different centripetal force than if they were standing still at that particular location (I know the person would experience jerk while moving along, but would they experience a...
  8. E

    Radial & Angular Trajectory: Solving for Force

    Homework Statement A particle with mass 10kg starts from rest at r = 10 and θ=0 radians, following the trajectory given by r=10-2t , θ=0.2t. Find the radial and angular components and of the force, as functions of time, that will cause this motion Homework Equations I am unsure what...
  9. D

    What is the work done by a radial force in this situation?

    Homework Statement http://img26.imageshack.us/i/1113001.jpg/ #11 Homework Equations C = 2πr w=fd The Attempt at a Solution it travels from point 1 to 2 so its half a circle so the distance is πR. πRF = w so i would guess its D. but the answer is A) zero. i do not know why...
  10. P

    Help on finding an expression for the radial force

    Homework Statement The potential energy of a system of two particles is inversely proportional to their separation, d. Find an expression for the radial force that each particle exerts on the other. Homework Equations The Attempt at a Solution I'm really stuck on this one guys...
  11. F

    Description of radial vector fields?

    I just came across the term, and was hoping someone could tell me what they are and any general form of them. Thank you!
  12. V

    Newtonian limit to schwarschild radial geodesic

    Hello Everyone, While trying to find the Newtonian limit to radial geodesic I was able to find that \frac{d^2r}{d\tau^2}=\frac{GM}{r^2} In the weak field limit we can naively replace \tau by "t" and recover Newtons Law, this though does not sound very rigorous. Can some-one suggest a...
  13. A

    Radial Motion in Schwarzschild's Geometry

    We consider the geodesic equation: (1): \frac{ d^2 x^\alpha}{ d \tau^2} = - {{\Gamma}^{\alpha}}_{\beta \gamma} \frac{d x^{\beta}}{d{\tau}} \frac{d x^{\gamma}}{d {\tau}} For radial motion in Schwarzschild geometry (2): \frac{d^2 r}{d \tau^2} = - {M / {r^2}} { (1 - {{2M} {/}...
  14. Y

    Radial velocity/magnitude/luminosity

    Homework Statement The spectrum of a quasar with a redshift of 0.20 contains two sets of absorption lines, redshifted by 0.15 and 0.155, respectively. If h0 = 70 km/s/Mpc, estimate the distance between the intervening galaxies responsible for the two sets of lines. Homework Equations H0= 70...
  15. 1

    Tangential and Radial Acceleration of car around a curve

    Hi, I have a problem with this problem.. The figure (in the attachment) shows a bird's-eye view of a car going around a highway curve. As the car moves from point 1 to point 2, its speed doubles. Which vector shows the direction of the car's average acceleration between these two points...
  16. P

    Prove Radial Fields are conservative and at the origin.

    Prove Radial Fields are conservative... and at the origin. 1. Homework Statement Prove the radial field F = r / |r|^p is conservative on any region not containing the origin. For what values of p is F conservative on a region that contains the origin? 2. Homework Equations v x F = 0...
  17. L

    Planetary Motion - Object has both tangential and radial velocity components

    Homework Statement A meteor is moving at a speed of 20000mi/hr reltiave to the centre of the Earth when it is 350 mi from the surface of the earth. At that time, the meteor has a radial velocity component of 4000 mi/hr toward the center of the earth. How close does it come to the Earth's...
  18. C

    Relating Radial Strain to Circumferential

    Hi, I have a solid cylinder to which I have strain gauges attached to measure axial and circumferential strains. My goal is to relate the circumferential strain to radial strain and then to calculate possion's ratio. Every time I try to work out the geometry of the problem I end up saying...
  19. A

    How Do You Calculate Radial Acceleration at the Equator Due to Earth's Rotation?

    Knowing that the diameter of the Earth at the equator is 12 740 km, compute the radial acceleration of a point on the surface of the Earth at the equator, due to the rotation of the Earth about its axis.
  20. T

    Motion in curves - Find radial and circumferential components of V and A

    Homework Statement At time t, a comet has the position R = (t2-1)i + 2tj At t = 2, find the radial and circumferential components of velocity and acceleration Homework Equations Vr = V * Ur Vθ = V * Uθ ar = a * Ur aθ = a * Uθ Ur = cosθ i + sinθ j Uθ = -sinθ i + cosθ j...
  21. G

    Understanding Radial Float - What is it?

    Hello everybody... another basic question. While trying interpreting a blueprint I stumbled on RADIAL FLOAT . Do you know a definition for a Radial Float? Thnx
  22. M

    Uniform radial electric field?

    In textbooks or other texts that discuss electrodynamics at some point always the term 'uniform' is introduced to describe particularly simple (symmetric) charge distributions, electric fields, etc. In trying to imagine what a uniform charge distribution - which, of course, is a mathematical...
  23. A

    Can the Angular Dependence Be Ignored in the Hydrogen-Atom Radial Solution?

    Hi, in an assignment I have to include the radial solution of the schrödinger-equation. That is, that you solve it for the radial dependence only. Now, I do get, that the force between the electron and nuclues depends only on r, but what I still don't get is why you can supress the angular...
  24. E

    Confused by radial vs. centripetal acceleration

    Hi I've been working through some examples from the course material we use in physics class, but one thing keeps confusing me: What is the difference between centripetal and radial acceleration? For instance, when we have a particle traveling in a circular path, the acceleration towards...
  25. W

    Show that R satisfies the radial Schrodinger equation

    Homework Statement Starting with \psi(r,\theta,\phi)=R(r)Y(\theta,\phi) saubstitute into the Schrodinger equation and show (using the technique of separation of variables) that R satisfies: (\frac{\hbar^2}{2m}\frac{1}{r^2}\frac{d}{dr}(r^2\frac{d}{dr})+\frac{C}{2mr^2}+V(r))R=ER(r) Homework...
  26. M

    Radial component of a velocity vector - cylindrical coordinates

    Hi there, I'm trying to determine the radial component of a velocity vector in a disk. The vector doesn't (necessarily) start from the centre of the disk and can be pointed in any direction. I've attached a .pdf with the schematics - it seems like a simple problem but it has me stumped...
  27. C

    About the unit of Radial wave function R(r) of Hydrogen atom

    The 1s radial function of the wave function of H atom is: R10=2 a-3/2e-r/a ,where a = 5.29*10-11 meter but substituting a with its value,we will get R10 = 5.2*1015 *e(-1.89036*1010 r) and that is impossible if r=a and R(r)=1.9*1015 where is the problem ? What's more, the unit...
  28. L

    Radial arms of the SBa, Sbb and Sbc galaxies - why are they radial?

    When looking at the classifications of galaxies in the attached image, how do we explain the SB types - especially the SBc which has long arms that reach out radially before beginning to spiral? If these arms are spinning, then regardless of the speeds we measure, along the straight...
  29. A

    Radial Velocity of the Sun around Galactic Centre

    I need to calculate the radial velocity of the sun. Every time I try using Newton's Laws of Gravitation, I end up getting a value of 0.733 m/s. Apparently the actual value is 220000 m/s. Mass of Sun = 1.99 x 10^30 kg (3sf) G = 6.67 x 10^-11 Nm^2kg^-2 r = distance of Sun from galactic centre...
  30. C

    A radial acceleration problem.

    Homework Statement [PLAIN]http://img508.imageshack.us/img508/6861/21296472.jpg I tried to get a_rad and if i didn't make any mistake, then a_rad = 15.79 m/s. I need to find angle when the bean is at vertical equilibrium. Homework Equations a_rad= v^2/R = 4(pi)^2R/T^2...
  31. N

    Fundamental solution to the radial wave equation

    i was wondering if anyone could point me towards any resources (including books, papers, and/or notes) that discusses and explicitly derives the fundamental solution to the radial wave equation. i have evans' PDE book, but it isn't contained there, and I've been having trouble searching for it...
  32. C

    Can someone help me with expectation values for the radial wavefunction?

    Show that the expectation value of Lz is -2h for the radial wavefunction Y2,-2. ? Can someone do this?
  33. E

    Radial acceleration, car sircular path

    Homework Statement A car is traveling with constant speed over a hill and down a hill. The radius of the curve is the same. At the top of the hill, the driver experience no normal force from the ground. The mass of the driver is 70.0kg a) calculate the value of the normalforce experienced by...
  34. Shackleford

    Radial Wave Function: Solving Equation for Normalized Radial Wave Function

    Radial Wave Function; Normalized Radial Wave Function 5. Is the brute-force method the only way to show the Equation is satisfied? By that I mean differentiating R20 once, twice, and substituting it in? I tried that earlier, but it was very nasty...
  35. X

    Ball in Vertical Circle on End of String, Tangential and Radial Acceleration

    Homework Statement A ball swings in a vertical circle at the end of a rope 1.30 m long. When the ball is 36.1° past the lowest point on its way up, its total acceleration is (-22.5 i + 20.2 j) m/s2. (a) Determine the magnitude of its radial acceleration. (b) Determine the speed and velocity...
  36. J

    Radial current in a curved wire?

    Direct current flows through curved wire with finite thickness. Will there be current in radial direction due to curvature (so to say, "charge inertia")? I suppose this radial current will be due to self-induction.
  37. P

    Circular motion and radial acceleration

    Homework Statement A particle moves with a constant angular acceleration Alpha in a circular path. The time at which the magnitude of tangential and radial accelerations are equal is a) 1/Alpha b) Sq.root Alpha c) 1/Sq.root Alpha d) Alpha Homework Equations The Attempt at a Solution...
  38. P

    Time of Equal Tangential & Radial Accelerations in Circular Motion

    Homework Statement A particle moves with a constant angular acceleration Alpha in a circular path. The time at which the magnitude of tangential and radial accelerations are equal is Homework Equations The Attempt at a Solution
  39. P

    Radial and Tangential Acceleration Question

    A ball tied to the end of a string 0.5 m in length swings in a vertical circle under the influence of gravity. When the string makes an angle of 20 degrees with the vertical, the ball has a speed of 1.5 m/s. Find the tangential component of acceleration at this instant. Help! Tangential...
  40. R

    Calculus - Tangent lines and radial lines

    Homework Statement Let P be any point (except the origin) on the curve r=f(θ). If ψ is the angle between the tangent line at P and the radial line OP, show that tan(ψ)= (r/(dr/dθ)) Hint: Observe that ψ = φ - θ in the figure. Homework Equations Very few equations come to mind except y =...
  41. 5

    What is a radial Node ? What is an Angular Node ?

    Can anyone give me a picture of what the above terms mean..I know the mathematical meaning like But i want to know like how and what exactly is a radial node and an angular node ! The node of an S sub shell is easy but where are the nodes in the P and d Sub shell ? And please explain...
  42. L

    Find radial velocity of star from orbiting body

    How do I get radial velocity of a star given a single body orbiting it in a 2-body system? I have the mass of both objects and for the second object it's eccentricity. Assume everything else is default or zero like the mean eccentricity. I compute the barycenter between the star and...
  43. V

    Formula for radial acceleration

    Homework Statement A small body of mass 0.51 kg is attached by a 0.52 m long cord to a pin set into the surface of a frictionless table top. The body moves in a circle on the horizontal surface with a speed of 2.1π m/s. (a) What is the magnitude of the radial acceleration of the body...
  44. A

    Radial motion into an Einstein-Rosen bridge (Poplawski)

    "Radial motion into an Einstein-Rosen bridge" (Poplawski) Hi everyone, this is my first post on Physicsforums. I've enjoyed lurking and learning from the knowledgeable folks here. I have a question about a paper titled: "Radial motion into an Einstein-Rosen bridge," Physics Letters B, by...
  45. J

    Radial distribution function - weird result

    Radial distribution function -- weird result Dear all, I think I'm having trouble with my radial distribution function (RDF) calculation and would greatly appreciate it if anyone could give me some insight. I was testing my RDF calculation subroutine to get RDF for certain colloidal...
  46. I

    Probability density versus radial distribution function

    Okay, this is a really basic question. I'm just learning the basics of QM now. I can't wrap my head around the idea that the radial distribution function goes to zero as r-->0 but that the probability density as at a maximum as r-->zero. How can this be? Thanks!
  47. Y

    Question on Dirichlet problem in cylinder with radial symmetry.

    This is not homework. I have problem deriving the solution for cylinder with radial symmetry given: \nabla^2U(\rho,z)=R''+\frac{1}{\rho}R'+\frac{Z''}{Z}=0 Which give \rho^2 R''+ \rho R' -k\rho^2 R=0 \hbox { and } Z''+kZ=0 With given boundary conditions U(\rho,0) = U(\rho,h) =0...
  48. A

    Radial probability density / quantum numbers.

    In my notes for a module on atomic and molecular physics it has this statement: "For a given n the probability density of finding e- near the nucleus decreases as l increases, because the centrifugal barrier pushes the e- out. So the low-l orbitals are called penetrating." I just want to...
  49. R

    Flux integral on a radial vector field

    Homework Statement (The S1 after the double integral is supposed to be underneath them btw, I just can't seem to do it right using LaTeX right now so bear with me please.) Suppose F is a radial force field, S1 is a sphere of radius 9 centered at the origin, and the flux integral...
  50. F

    Solving radial wavefunction in odd central potential

    Hey guys, I have a question regarding solving a radial wavefunction DE which i have written up in Mathematica and saved as a pdf http://members.iinet.net.au/~housewrk/PFpost.pdf" as I was already doing the work in MM and writing it all up again in LaTeX seemed a bit of a waste of time. If...
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