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. Jonathan Scott

    Schwarzschild solution radial coordinate and black holes

    When people appear to be getting very confused about the weird nature of black holes, I normally respond with answers based on standard black hole theory, but I sometimes feel I should also call attention to the point that some people now think that the "black hole" solutions to the...
  2. B

    Radial force of a rotating stick

    Radial force of a rotating stick! 1. The Problem In this problem we want to learn a little bit about what is sometimes called dynamical loading. Our simple system consists of a uniform stick of length L and mass M hinged at one end. We would like to calculate the forces on the (frictionless)...
  3. S

    Radial function in Spherical potential well

    Homework Statement A Spherical potential which is 0 for 0<r<a Vo for r>a Find the condition for bound states, for the radial function with l=0 Plot the result.The Attempt at a Solution I have gotten the equation - tan(ka)=k/lambda where k is the wavenumber for the wave inside the well and...
  4. V

    Tangential and radial components of acceleration - answer seems odd

    Homework Statement A 60 cm diameter wheel accelerates uniformly about its center from 120 rpm to 300 rpm in 5s. 1) Determine its angular acceleration. 2) Determine the radial component of the linear acceleration of a point on the edge of the wheel 2s after it has started accelerating...
  5. E

    Elastic Collision of a Ball and Block on a Wire

    Homework Statement A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal and the ball is released from rest. It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air resistance is negligible...
  6. P

    Radial Acceleration of Point on Planet: Calculate Using v^2/r

    Consider a planet of radius 5.53X10^6 m with a rotation period of 24.3 hours. Compute the radial acceleration of a point on the surface of the planet at the equator due to its rotation about its axis. What is the Radial Acceleration. I found out that the formula for radial acceleration is...
  7. A

    Radial acceleration around a planet

    Homework Statement Consider a planet of radius 7.31 x 10^6 m with a rotation period of 25.4 hours. Compute the radial acceleration of a point on the surface of the planet at the equator owing to its rotation about its axis. Homework Equations T = [2(pi)r]/v a_r = -[(v^2)/r] The...
  8. S

    Radial and tangential acceleration

    Homework Statement A point on a rotating turntable 21.5 cm from the center accelerates from rest to a final speed of 0.800 m/s in 1.75 s. At t = 1.28 s, find the magnitude and direction of each of the following. Homework Equations (a) the radial acceleration (b) the tangential...
  9. J

    Force between two electromagnets due to direct flux and radial flux

    I want to know about the FORCE BETWEEN TWO ELECTROMAGNET OF RECTANGULAR CROSS-SECTION. The force due to the fluxes both direct face to face and radial seperately. Also I like to get the exact formula or the source from where I get that. Can anyone help me? pls.
  10. K

    Determine the tangential and radial acceleration of the car

    Homework Statement A car at the Indianapolis 500 accelerates uniformly from the pit area, going from rest to 250 km/h in a semicircular arc with a radius of 230 m. Determine the tangential and radial acceleration of the car when it is halfway through the turn, assuming constant tangential...
  11. T

    Radial acceleration with earth

    Homework Statement Objects that are at rest relative to Earth's surface are in circular motion due to Earth's rotation. What is the radial acceleration of a painting hanging in a museum at a latitude of ϕ = 38.9° North? (Note that the object's radial acceleration is not directed toward the...
  12. E

    Tangential and radial train acceleration

    Homework Statement A train slows down as it rounds a sharp horizontal turn slowing from 90.0 km/h to 50.0km/h in the 15 s that it takes to round the bend. The radius of the curve is 150 m. Compute the acceleration at the moment the train speed reaches 50km/h. Assume it continues to slow down...
  13. D

    Tangential and radial acceleration of particle

    Homework Statement In the case of a speeding particle undergoing circular motion: a) the tangential acceleration is int he direction of the velocity vector and the radial acceleration points in the direction of the position vector b)the tangential acceleration is perpendicular to the...
  14. F

    (kinematics) Is it to derive into radial and transverse components?

    Homework Statement A wire OA connects the collar A and a reel located at O as shown in the picture. Knowing that the collar moves to the right at a constant speed v0, determine θ'' (the 2nd-order-derivative of θ) in term of v0, b and θ. http://www.freeimagehosting.net/uploads/3cad8b54c6.jpg...
  15. T

    Radial acceleration quesiton

    Howdy all, I had a quick question: An example problem in my physics book (Physics for Scientists and Engineers, 6th edition, Serway and Jewett) is going over tangential and radial acceleration (it is example 4.9, if you've got a copy lying around). The question is as follows: A car...
  16. Y

    Why Two Bearings Supporting Axial & Radial Loads is Not Good Engineering Practice

    Hello, does anyone know why for a shaft with 2 bearings A and B, why is it not good engineering practice for both bearings to support axial and radial loads? while it is better if one supports axial and radial loads while the other bearing only support radial loads.
  17. N

    What are some freeware options for fitting radial velocity data?

    Hi all, I am attempting to find the best Keplerian fit to the Radial velocity data vs. Time such as this plot: http://austral.as.utexas.edu/planets/hd37605/hd37605.html I was wondering whether anyone could suggest some freeware that might be able to help me out. Any information would be...
  18. P

    Is the Radial Momentum Operator Hermitian?

    Does anyone has proof of radial momentum operator as an Hermitian operator? Thanks.
  19. S

    Radial Free Fall Proper Time

    Foster and Nightingale give an equation for the proper time of a radially falling clock between any two distances. (Short Course in General Relativity, 1979, p. 128.) As they state, the equation is the "same as its Newtonian counterpart." So there are no factors representing any slowing of the...
  20. S

    WARD."Help Me Understand 30° Angle Between W and Radial Axis

    1. Ok here is a diagram I am HAVE NO IDEA HOW THE 30 DEGREES between the W force came and the radial axis! CAN sOMEONE SHOW ME or EXPLAIN PLZZz I suck at angles! http://img171.imageshack.us/img171/9158/50446152db6.jpg [/URL] W is acting DOWN
  21. J

    Radial visualization & spring forces

    Hi, I am taking a Data Mining course and have this problem in radial visualization. To complete this problem, we use some physics formulas, which I really do not understand. Derive formulas for radial visualization of: a. 3-dimensional samples b. 8-dimensional samples Homework Equations...
  22. V

    Radial Acceleration in cylindrical coordinates

    Hey guys, Been given this formula for radial acceleration, I am not sure how they derived it. I have tried but the only forumla I know is a(radial) = v^2/r A_{r} = \ddot{r} - r\dot{\theta}^{2}EDIT - should be minus not plus
  23. A

    Where Can I Find the Radial Velocity of the Sun Relative to Earth?

    Hey, Does anyone know where to find a value for the radial velocity of the Sun wrt the Earth? I've tried googling, but it always gives the radial velocity wrt the LSR. Thanks muchly!
  24. S

    What is the Radial Acceleration

    Consider a planet of radius 5.53 106 m with a rotation period of 24.3 hours. Compute the radial acceleration of a point on the surface of the planet at the equator due to its rotation about its axis. What is the Radial Acceleration. the formula I have is (4Pi^2R/T^2)
  25. T

    Radial geodesic distance with Schwarzschild's solution

    Given we have a spherically symmetric gravitational field around a spherically symmetric body of mass M. How can I calculate the actual (geodesic) distance between two points with the same angle but at different distances from the center of the body (and field). I came immediately to think of...
  26. H

    Observed radial velocity of a Binary Star system

    Homework Statement Consider a double-star system with two stars, A and B, in circular orbits of the same period T about their center of mass. The Earth is in the plane defined by these orbits at a distance R of many light-years. Let the speed of A in its orbit be u; then at any instant it has...
  27. M

    Symmetry of mass distribution producing radial gravitational force field

    I conjecture that only spherical symmetric mass distribution can produce radial gravitational force field (according Newton's law of gravitation). Can anybody prove or disprove this conjecture?
  28. J

    Finding Radial Electric Field

    Particles having mass = m and charge = Q travel parallel to the z axis, forming a beam of radius = R and uniform charge density = p. To keep the beam focused, an external uniform electric field _{}Bo, parallel to the z axis is provided, and the beam is made to rotate with a constant, uniform...
  29. I

    Tethebal| problem, radial acceleration, angle of ball orbit

    Homework Statement This is a concept/procedure question. I am playing teth3rbalI with a 1 kilogran ball and it is tied to a meterlong string. When I hit the ball it circles the pole at 1.6 Hz. Find the anglethat the string makes with thepole. Homework Equations a_{r}=v^{2}/r...
  30. F

    How Can Momentum and Radial Force Help Solve a Collision Problem?

    Homework Statement A 17.00 kg lead sphere is hanging from a hook by a thin wire 3.00 m long, and is free to swing in a complete circle. Suddenly it is struck horizontally by a 5.00 kg steel dart that embeds itself in the lead sphere. What must be the minimum initial speed of the dart so...
  31. N

    CRIRES (VLT) Radial Velocity Sensitivity

    I know CRIRES is unstable right now but it should be back to full operation next year I hear. Does anyone know what it's limit of sensitivity will be for radial velcoity measurements (in m/s)?
  32. J

    Car Radial and Tangential Acceleration

    A car speeds up as it turns from traveling due South to due East. Exactly halfway around the curve, the car's acceleration is 3.40m/s^2, 30.0º north of east. We are supposed to find the radial and tangential components of the acceleration at the halfway point. I thought that I...
  33. D

    Relationship between radial and angular acceleration

    Homework Statement State the Relatrionship between radial and angular acceleration. Homework Equations Well I presume the equations would be "radial acceleration = v(squared)/radius" The Attempt at a Solution I cannot find the equation for radial AND angular acceleration?? I...
  34. N

    Radial and Tangential Acceleration

    A train slows down at a constant rate as it rounds a sharp circular horizontal turn. Its initial speed is not known. It takes 17.7 s to slow down from 68 km/h to 26 km/h. The radius of the curve is .184 km. As the train goes around the turn, (a) what is the magnitude to the tangential...
  35. W

    How Is Work Calculated for a Charge Moving in a Radial Electric Field?

    Homework Statement Carefully study the following plot of electric field E in N/C versus distance r in m and answer the questions that follow. The electric field is directed radially outward, and the variation of E with r is independent of direction. Refering to the figure, determine the...
  36. N

    Radial and Tangential Acceleration.

    So, I attached a photo of what the figure given looks like. Here is the corresponding problem: The figure represents the total acceleration of a particle moving clockwise in a circle of radius 2.50 m at a certain instant of time. At this instant, find (a) the radial acceleration, (b) the...
  37. N

    Radial acceleration of a discus

    This may seem like a silly way to second-guess an answer, but the problem below seems to have an answer entirely too easy to obtain. O_o And I doubt that I'm getting any better. An athlete rotates a 1.00-kg discus along a circular path of radius 1.06m. The maximum speed of the discus is...
  38. M

    Circular motion (magnitude of radial acceleration)

    a ball swings in a vertical circle at the end of a rope 1.5m long. when the ball is 26.9 degrees past the lowest point on its way up, its total acceleration is -22.5i+20.2j. at that instant (b) determine the magnitude of its radial acceleration isnt the magnitude of Ar... +20.2m/s^2 ? The...
  39. O

    Radial acceleration of a turntable

    This is from an example in a book: On a horizontal turntable that is rotating at constant angular speed, a bug is crawling outward on a radial line such that its distance from the center increases quadratically r=bt^2, \theta=\omegat where b, \omega are constants. The example then solves for...
  40. V

    How to use extra term in radial equation

    Homework Statement Due to the modification of inner-shell electrons of a multi-electron system, the outer shell electron can feel an effective electrostatic potential as V(r)=-e^2/(4*π*eo*R)-lambda*(e^2/(4*π*eo*R^2)) ; 0<lambda≤1 Find the energy eigenvalues and wavefunctions of the...
  41. P

    How do you find the radial value?

    What is the radial value for the 3rd root of the complex number 4 + -2i ?
  42. D

    Incoming spacelike radial geodesic

    We need to show that using the Schwarzschild metric, an incoming radial spacelike geodesic satisfies r>= 1m/(1 + E^2) I know that E = (1-2m/r) is constant, and I think that ds squared should be negative for a spacelike geodesic. I try substituting E into the metric and setting ds squared <=0...
  43. S

    Radial Wavefunc Homework: Find Probability of Electron in He+ Ground State

    Homework Statement Consider the electron in an atom of the heavy isotope of hydrogen, tritium. The nucleus has charge e, and, apart from a small correction due to the reduced mass effect, the electron has energies and eigenfunctions that are identical to those of an ordinary hydrogen atom...
  44. R

    What are the Two Forms of Acceleration in Circular Motion?

    I know the equation (\frac{v^2}{r}) but what is the description of radial acceleration? I saw couples of internet sites but I don't get it. Can someone explain it to me in a dull way and use typical examples of this? Thanks:smile:
  45. W

    Tangential and radial particle acceleration

    Homework Statement A particle moves in the xy plane in a circle centered origin. At a certain instant the velocity and acceleration of the particle are 4.6j m/s and (2.3i - 2.1j) m/s^2. What are the x and y coordinates of the particle at this moment Homework Equations ar=-v^2/r The...
  46. E

    Calculate Value of r for Hydrogen Atom 3p Orbital Node

    "(a) Use the radial wave function for the 3p orbital of a hydrogen atom (see Table 15.2) to calculate the value of r for which a node exists. (b) Find the values of r for which nodes exist for the 3s wave function of the hydrogen atom." For part a, I looked at Table 15.2 and found the equation...
  47. W

    Need help fast Radial probablility density in ground state hydrogen

    I'm working all alone with nobody to help me, and now I'm stuck! :( I'd really appreciate it if you could help me out. I'm working with the ground state of the one electron hydrogen atom. Trying to determine the radial dependence on probability density. It should only depend on the radial...
  48. B

    Radial Probability: Finding Max Distance From Proton for 2s State Electron

    Question: What is the most probable distance from the proton of an electron in a 2s state? Answer: The most probable radius is where the radial probability is maximum. We are given R_{2,0}(r)=\frac{1}{(2a_0)^{3/2}}2(1-\frac{r}{2a_0})e^\frac{-r}{2a_0} so we have P(r) =...
  49. C

    Centripetal vs Radial: Explaining Difference to Understand

    Can anybody please explain me the difference between "centripetal" and "radial"? I get stuck in distinguishing them! centripetal force, centripetal acceleration... radial force, radial acceleration... I also don't understand why they say that "In uniform circular motion, the difference...
  50. B

    Radius from Radial Acceleration

    An unbanked circular highway curve on level ground make a turn of 90 degree. The highway carries traffic at 60 mph, and the centripetal force on a vehicle is not to exceed 1/10 of its weight. What is the minimum length of the curve in miles? I am working towards the arc contained within...
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