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. O

    The precision in measurements of radial velocities by DE?

    Hello, I have an exercise here that I need help with. The precision in measurements of radial velocities by the Doppler effect is currently 1 m/s. Can a Jupiter like planet orbiting a star similar to the Sun at a distance from the mother star equal to the Sun-Jupiter distance be detected? (Use...
  2. P

    New Radial Velocity Experiment (RAVE) Data Release

    The RAVE project site: https://www.rave-survey.org/project/ In the above image taken from one of the RAVE DR5 video, surveyed stars are shown in 3D and color coded according to their positive or negative radial velocity relative to the Sun. I'm a bit puzzled that stars on one 'side' tend to...
  3. V Anirudh Sharma

    Radial wave function and other graphs

    1.what is the difference between radial wave function(R),radial probability density(R^2) and radial probability function(4*π*r^2* R^2)?
  4. O

    Finding relative error for radial acceleration

    Homework Statement I'm trying to find da/a to calculate the relative possible error in the radial acceleration. The equation I have to derive from is a = 4π²n²rt ⁻² (it cannot be a = v²/r). I'm not really sure how to find da since it has 3 variables? Homework Equations a = 4π²n²rt ⁻² da/a =...
  5. Vavi Ask

    Radial force in a circular motion

    Homework Statement Given- Mass of particle=m Radius of the circular path=r Magnitude of linear momentum= p Find the radial force acting on the particle. Homework Equations p=mv acentripetal=v2/r The Attempt at a Solution Fradial=macentripetal =mv2/r =mv2×m/r×m...
  6. E

    I Calculating Radial Distance to Midpoint of a Straight Line on an Octagon

    Hi perhaps someone can point me in the correct direction. If I have an Octagon and the co-ordinates of two points on separate faces, example, face 1 (xo,yo) and face 2 (x1,y1). And I draw a straight line connecting the two points. How can I calculate the radial distance to the midpoint of...
  7. V

    2 Body Radial Equation, Effective Potential derivation

    According to my textbook, in the derivation for the effective potential U_{eff}, starting with the Lagrangian L = \frac{1}{2}\mu(\dot r^2 +r^2\dot\phi^2) -V(r), substituting into Lagrange's equation gives \mu\ddot r = -\frac{\partial V}{\partial r} + \frac{l^2}{\mu r^3} =...
  8. S

    Radial contraction of a stretched hyperelastic cylinder

    Hi, I'm trying to work out how much strain potential I can produce in a cylinder but I want to know how much is stored for any specific part of the cylinder. The problem then is this: I have a cylinder of original dimensions r and h, where h is the original height and r is the radius. It is...
  9. T

    Can a Swash Plate Mechanism be Adapted for Radial Displacement Along a Spoke?

    This is a hard one to describe and I couldn't think of a better tittle, sorry. My aim has been for a while to create a mechanism which allows me to move an object (i.e a washer or something) in or out radially along a spoke of a wheel. However I have some restrictions which have made me scrap...
  10. GetLastError

    Need help with toy design (linear + radial bearing)

    Hi, I'm building a toy and I'd like it to spin around a vertical shaft but also move freely up and down while it is rotating. Also, I'd like that the rotating body will get spinned using a gear which will be positioned in a fixed location on the shaft (at the bottom) while the rotating body...
  11. D

    How to calculate the applied radial load on a bearing?

    Hi, I am doing design calculations for a Variable Pitch Propeller and I have to calculate bearing life. A deep groove ball bearing is used for a mainshaft (driveshaft). And the mainshaft is connected to the propeller hub. I know the basic formula for calculating the bearing life but I am having...
  12. kenyanchemist

    I Demerits radial distribution functions

    i have a question, why is the plot of r2(Ψ2p)2 not a good representation of the probability of finding an electron at a distance r from the nucleus in a 2p orbital
  13. henrco

    Galactic longitude and radial velocities

    Hi, I'm pretty happy with my answer to part i). But could I get guidance for my answers to part ii), iii) and iv). I think they are correct... However I'd like to understand that with the data provided is there a way of actually determining the distance for each component to the GC and...
  14. L

    Does a Radially-Impulsed Astronaut on the ISS Return to the Same Spot?

    I understand that if there is a body in a circular orbit around the Earth (or any other thing), and there is an impulse directed radially out away from the Earth against the orbiting body, the body will end up in an elliptical orbit, which will pass through the original circular orbit. This got...
  15. K

    Radial dependencies with electric field

    so for uniform charge densities, a point "r" from the center of a ring of charge has an E ∝ 1/r^2 a point "r" from center of a long line of charge has an E ∝ 1/r and for an infinite plane, a point "r" from it where r<<length of plane has E not dependent on r my question was why is it that...
  16. J

    Radial acceleration of a particle in a groove on a turntable

    Homework Statement A horizontal turntable rotates at a constant rate ω about a fixed vertical axis through its center O. A particle of mass m can slide in a fictionless circular groove of radius r centered at O' which is r/3 from O. What is the radial acceleration of m in direction O'm...
  17. KostasV

    Orthonormality contition for radial functions of hydrogen

    Hello people ! Hope you are fine! I tried to find the inner product that u can see below, between two different radial functions. I was expecting to find zero but i found something nonzero. You can see my two questions below in the photo.
  18. Y

    Will Radial Escape Velocity Launch a Satellite Into Orbit?

    If we provide a satellite with escape velocity perpendicular to the earth(radially), would it start orbiting it?
  19. S

    Can an Atom's Valence Electrons Be Used as a Radial Antenna?

    As any RF engineer knows the radial antenna is something pure theoretical. But as someone who loves physics an idea came to my mind. Please tell me if this would work and if not, why does it fail to work. So: Assuming we have an atom with 8 valence electrons which is hit with 8 photons with...
  20. vetgirl1990

    Finding radial & tangential acceleration at a point

    Homework Statement A point on a rotating turntable 20.0cm from the center accelerates from rest to final speed of 0.700m/s in 1.75s. At t=1.25s, find the magnitude and direction of (a) the radial acceleration, (b) the tangential acceleration, (c) the total acceleration of the point. Homework...
  21. tomdodd4598

    Normalised Radial Coulomb Wave Function

    Hey there, I used Mathematica to find the (non-normalised) wave function of an electron in the vicinity of a Hydrogen nucleus, and converted the answer from one involving Whittaker functions to one involving generalised Laguerre polynomials. My result is shown below: This agrees with the...
  22. Summer95

    Dimensionless Radial Equation Hydrogen Atom

    Homework Statement Show that in terms of the dimensionless variable ##\xi## the radial equation becomes ##\frac{\mathrm{d}^{2} u}{\mathrm{d} \xi^{2}}=(\frac{l(l+1)}{\xi^{2}}-\frac{2}{\xi}-K)u## Homework Equations ##u(r)\equiv rR(r)## ##\xi \equiv \sqrt{2\mu U_{0}}\frac{r}{\hbar}##...
  23. L

    Fourier transform of function which has only radial dependence

    3d Fourier transform of function which has only radial dependence ##f(r)##. Many authors in that case define \vec{k} \cdot \vec{r}=|\vec{k}||\vec{r}|\cos\theta where ##\theta## is angle in spherical polar coordinates. So \frac{1}{(2\pi)^3}\int\int_{V}\int e^{-i \vec{k} \cdot...
  24. P

    Radial Suction Fan Design & Equations

    Hi, I've been considering the design of a fan that sucks air radially and blows axially to resolve a technical problem of a machine. I've looked around for the equations governing the air particles and the angle of the radial blades (angle between a flat blade and a radial line) of the fans, but...
  25. T

    Magnitude of radial component of jerk along line of centres

    Homework Statement Show that the component of the jerk along the line of centres of two gravitating bodies has magnitude 2G(m1+m2)r(dot)/r3. Homework Equations (Eq. 1) r(double dot) = - G(m1+m2)r(hat)/r2 (acceleration of body 2 relative to body 1) The Attempt at a Solution Sorry for the...
  26. S

    Hoop + radial + axial = multi axial stress?

    Hi i was wondering if a cylinder has hoop stresses, radial stresses and axial stress would that be multiaxial stresses? Thank you
  27. H

    Central Force problems using radial motion equation

    Homework Statement a satellite is in a circular orbit a distance $h$ above the surface of the Earth with speed $v_0$, booster rockets are fired which double the speed of the satellite without changing the direction. Find the subsequent orbit. Homework Equations The Attempt at a Solution Before...
  28. J

    Period of radial oscillations

    Assuming a neutron star is a uniformly dense sphere of radius 10km and mass =1.4 mass of sun, derive the period of radial oscillations.First use hydrostatic equilibrium to calculate p, then the velocity of sound is $$v= \sqrt{ \gamma p / \rho}$$, so the period of pulsation is time it takes from...
  29. billy_joule

    Radial Deflection of a rotating shaft

    This is a series of question that appear to become more and more vague, the last part has me stumped. 1. Homework Statement A) I have an electric motor that produces 0.4 HP of shaft power at a speed of 2800rpm. What will the gearbox speed and torque be on the output of a 1:5 (in : out)...
  30. D

    Tapered Roller Bearing - Static Radial Rating

    I'm evaluating whether indirectly mounted Tapered Roller Bearings (http://goo.gl/FpOEri) are suitable to withstand a given radial and axial loads in both static and dynamic application. I've managed to find the required dynamic load rating C_90 (or C_10) with the help of the book "Mechanical...
  31. T

    Divergence of radial unit vector field

    Sorry if this was addressed in another thread, but I couldn't find a discussion of it in a preliminary search. If it is discussed elsewhere, I'll appreciate being directed to it. Okay, well here's my question. If I take the divergence of the unit radial vector field, I get the result: \vec...
  32. Syed Alam

    Enthelpy rise hot channel factor and Radial form factor

    I am currently designing a whole-core for small PWR. I am calculating core life (years) vs. FdH and RFF. What is the difference between "Enthalpy rise hot channel factor (FdH)" and "Radial form factor (RFF)"? I have calculated "CHANNEL FDH" which is same as "RFF". Do I have to try "CHANNEL...
  33. C

    What Causes Asymmetric Rotational Velocities in Galaxies?

    [Mentor's Note: Post moved to its own thread from here: https://www.physicsforums.com/threads/find-radial-velocity-of-galaxies.813006/] I suppose this thread might be an appropriate place for me to add my request for assistance on the question of rotating galactic systems. I am interested in...
  34. Quarlep

    Find Radial Velocity of Galaxies

    I searched galaxies and their radial velocities in online but I found nothing can you give me a list about them. Thanks
  35. S

    Boundary conditions of the radial Schrodinger equation

    Consider the radial differential equation ##\bigg( - \frac{d^2}{dr^2} + \frac{(l+\frac{d-3}{2})(l+\frac{d-1}{2})}{r^2} + V(r) + m^2 \bigg) \phi_l (r) = \lambda\ \phi_l (r)##, which I've obtained by solving the Schrodinger equation in ##d## dimensions using the method of separation of...
  36. D

    Angular vs Radial Acceleration

    Homework Statement The cosmoclock 21 Ferris Wheel in Yokohama City, Japan, has a diameter of 100m. Its name comes from its 60 arms, each of which can function as a second hand (so it makes one revolution every 60.0s). a) Find the speed of the passengers when the Ferris wheel is rotating at...
  37. P

    Definition Radial distribution function

    In some books the radial distribution function is defined as 4pi*r^2*R(r)^2 and in others as r^2*R(r)^2. Thus, a factor of 4pi is differing. Which expression is correct and why?
  38. R

    Tangential, Radial and total acceleration

    Hello, I have a question which I'm having hard time solving, Homework Statement A ride at the amusement park consists of a large, vertical drum in which people stand with their backs to the wall. The drum begins to rotate and eventually the people stick to the wall due to the acceleration –...
  39. Paradox101

    Radial Eigenfunction; Differential Equation

    Homework Statement Show that the radial eigenfunction unr,l is a solution of the differential equation: ħ2/2me×d2unr,l/dr2+[l(l+1)ħ2/2mer2 - e2/4πε0r]unr,l=Enr,lunr,lHomework Equations The radial function is R(r)=u(r)/r, so that the expression on the RHS is E×u. The Attempt at a Solution I know...
  40. C

    Radial distribution function in Debye-Huckel theory

    Homework Statement For a plasma containing two ionic species with opposite charges but the same density ##n_{\infty}##, calculate the radial distribution functions ##g_{++}(r), g_{-+}(r), ##where ##n_{\infty}g_{ij}(r)## is the conditional probability density for finding a particle of type ##i##...
  41. S

    Cylinder over a step -- Is the normal force radial?

    Homework Statement [/B] A horizontal force, ##F##, is applied to a cylinder of mass ##M## and radius ##R## (the line of action of ##F## goes through the center) in order for the cylinder to climb over a step of height ##R/2##. 1) Find the torque around ##A## and find force ##F## as a...
  42. Dethrone

    MHB Radial distribution of a 3d orbital

    How do I sketch the radial distribution of a $3d_{x^2-y^2}$ orbital? :D
  43. S

    Radial acceleration in a pendulum

    I'm just trying to think how I would expect radial acceleration to look like in a pendulum. I would expect a sine wave of sorts but instead of oscillating around zero I would expect it to be around a positive number as this acceleration is always in the same direction. Also if I was to compare...
  44. S

    Determine the magnitude of its radial acceleration for ball

    < Mentor Note -- Thread moved from the General Physics forum to HH > A ball swings counterclockwise in a vertical circle at the end of a rope 1.50 m long. When the ball is 36.9 degrees past the lowest point on its way up, its total acceleration is (-22.5i + 20.2j) m/s^2. For that instant, (a)...
  45. I

    Force on Ball Bearing: Should Torque be Included?

    I'm trying to work out the free body diagram for a router tool (which is basically used to cut wood sideways and create grooves and interesting shapes). I need to work out the free body diagram in order to find out the bearing load but I'm having difficulty with the aforesaid. The shaft that...
  46. T

    Circular Motion with time-dependent radial acceleration

    Homework Statement A particle is traveling on a circle with a radius R. The particle's radial acceleration is given as: a_r=At^4 At time t=0 the particle is at (R,0) . A. Find the distance that the particle has traveled as a function of time S(t) . B. Display the particle's acceleration...
  47. L

    Radial probability density of hydrogen electron

    Homework Statement I know this question has been asked before, but I am looking for a different kind of answer than the other poster. Bear with me here. Problem: For a hydrogen atom in the ground state, what is the probability to find the electron between the Bohr radius a0 and (1.01)a0...
  48. C

    What is the Radial Component of Velocity on the Surface of a Solid Sphere?

    Homework Statement In certain hydrodynamic flows the velocity of a liquid is given by v = -grad φ, where φ is referred to as the velocity potential. The potential given by: 'equation' corresponds to flow around a solid sphere of radius a. U is a constant. Determine the velocity of the...
  49. B

    Integrating Radial Probability Densities: A Guided Explanation

    Homework Statement Image: http://puu.sh/ca93V/7eb9abf342.png Homework Equations Ok I know to use this guy http://puu.sh/ca95c/ad0155a4d6.png Which then turns into this http://puu.sh/ca96W/68802e045c.png (except from .5a to 4a, not 0 to a)The Attempt at a Solution I get lost on trying...
  50. avito009

    Detecting more than 1 exoplanet using Radial Velocity Method.

    How do we detect if there is more than 1 exoplanet orbiting a star using radial velocity method? I read this but I didnt understand it. Can someone explain the answer in Laymans terms? "Multiple planets will cause a stars radial velocity curve to show two periods: a long gradual change due...
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