What is Manipulation: Definition and 191 Discussions

Object manipulation is a form of dexterity play or performance in which one or more people physically interact with one or more objects. Many object manipulation skills are recognised circus skills. Other object manipulation skills are linked to sport, magic, and everyday objects or practices. Many object manipulation skills use special props made for that purpose: examples include the varied circus props such as balls, clubs, hoops, rings, poi, staff, and devil sticks; magic props such as cards and coins; sports equipment such as nunchaku and footballs. Any other object can also be used for manipulation skills. Object manipulation with ordinary items may be considered to be object manipulation when the object is used out of its socially acknowledged context and used differently from its original purpose.
Object manipulators may also be practitioners of fire performance, which is essentially object manipulation where specially designed props are soaked in fuel and lit on fire.

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  1. J

    ID manipulation to troll science forums

    http://www.designinference.com/teaching/teaching.htm If you disagree with these policies feel free to contact the "professors": TA: jreed@ses.edu Instructor: wdembski@swbts.edu
  2. S

    Algebraic manipulation for easier integration

    Homework Statement I am trying to integrate x^2/(1+x^2 ) from 0 to 1. The Attempt at a Solution We recently worked on trig substitutions in class, but, rather than substituting x for tan(theta) I think there may be an easier way via algebraic manipulation. If I divide both...
  3. H

    Understanding the manipulation of Laplacian

    Hi; I am trying to understand the rytov approximation... and when I was studying that, I could not understand a manipilation... ΔeØ + k2eØ = 0 ▼[▼ØeØ] + k2eØ = 0 ▼2ØeØ + (▼Ø)2eØ+k2eØ = 0 I can not understand these manipilations... for a long time, I have searched the properties of...
  4. E

    PDF and CDF Integration Simplification

    Hello, I have this equation: \int_{-\infty}^{\gamma}f_X(x)\,dx+\int_{\gamma}^{\infty}F_Y(x-\gamma)\,f_X(x)\,dx where f_X(x) and F_Y(y) are the PDF and CDF of the randome variables X and Y, respectively. Now the question is: can I write the above equation in the form...
  5. N

    How Is Stellar Mass Distributed in the Milky Way?

    Homework Statement Assume the Milky Way contains about 3 × 10^11 stars that were formed all at once, with an initial mass function: \frac{dN}{dM}\propto M^{-2.35} in the range 0.1–100 solar masses. How many stars in the Galaxy are less massive than the Sun? How much mass do these...
  6. T

    QM- A bit of manipulation of expectation values.

    Homework Statement The variance of an observable Qhat in a state with wavefunction psi is, (delta Qhat)2=<(Qhat-<Qhat>)2> Show that this can be written as, (delta Qhat)2=<Qhat2>-<Qhat>2 Homework Equations As above. The Attempt at a Solution (delta...
  7. S

    How do I manipulate algebraic expressions?

    Homework Statement As part of a calculus question, the solutions manual takes \frac{2y^{2}}{4+y^{2}} And somehow turns it into \left(2-\frac{8}{4+y^{2}}\right) Ive scribbled all the things i can thinkof on paper and still can't seem to get from one to the other, its driving me nuts...
  8. D

    Algebraic manipulation of integral

    Homework Statement \int_0^{\frac{\pi}{2}} \frac{\cos(x)}{1+\sin^2(x)} \ln(1+\cos(x))\ dx The Attempt at a Solution Can anyone give me a hint as to what to do?
  9. R

    Tensor Manipulation: Is it Legal? | Homework Equations and Attempted Solution

    Homework Statement Wondering if one particular tensor manipulation is "legal" Homework Equations U^{ij}=\eta_{ab}F^{ia}F^{jb} where F is the electromagnetic tensor, antisymmetric, with zeros on the diagonal The Attempt at a Solution So, starting there, is it legal for me to do this...
  10. W

    Manipulation of Heat and Work Equations

    Dear all, How do you get from the 1st equation to the 2nd? dW = -RT dV/V dW = -RdT + RT dP/P Also, I’m trying to do the same for this additional pair below… dQ = C_V dT + RTdV/V dQ = C_P dT - RT dP/P Thanks.
  11. P

    Driven Harmonic Oscillator - Mathematical Manipulation of Equations

    1. Homework Statement and the attempt at a solution Please see attached. I'm not so sure if my problem lies with the physics or the mathematics. I have the distinct feeling that it's the latter and that I'm missing something elementary, but truly have no idea how to proceed. Any...
  12. J

    Adiabatic Spin Manipulation in EPR Experiment

    What would happen if adiabatic processes were applied in the context of a long-distance EPR Experiment? As background for my questions, see http://en.wikipedia.org/wiki/EPR_paradox" ) In the context of the foregoing, please visualize two particles that are...
  13. Wellesley

    Manipulating Matter: Exploring Creation of Food

    I apologize if I posted this in the wrong area. Hopefully, I chose correctly. I guess my question is linked to the composition of matter and our ability to manipulate it. If all things are made out of atoms (hence electrons, protons and neutrons), why can't scientists create food? As bizarre...
  14. A

    Trig manipulation troubles

    I'm following through a solution to a problem I couldn't do and there's a bit of trig manipulation I can't get my head around: 2cos^{2}x - sin^{2}x = 2 - 3sin^{2}x I tried using this identity to get it to work: cos^{2}x - sin^{2}x = 1 - 2sin^{2}x but alas, I could not. And after that...
  15. P

    Help with algebraic manipulation of an inequality

    Let R denote the set of all real numbers and Q the set of all rational numbers. Statement to prove: If x and y are in R with x < y, show that x < ty + (1-t)x < y for all t, 0 < t < 1. My work on the proof so far: Given x and y are real numbers with x < y. By theorem we know there...
  16. S

    Multiplicative Inverse Manipulation Valid?

    Homework Statement Let S be a field containing elements x and y. If a \neq 0 and b \neq 0 then ab \neq 0Homework Equations Field Axioms: Associative law for addition Existence of additive identity Existence of additive inverse Commutative law for addition Associative law for multiplication...
  17. wolram

    Weather Manipulation: Does it Work?

    Can it be said that some form of weather manipulation works? China seems to have had some success, http://news.slashdot.org/article.pl?sid=08/08/10/020213&from=rss Even if some form works is it worth the effort, are we just moving a (problem) to another location.
  18. B

    Tensor Manipulation in Spacetime and Geometry

    I am self-studying GR and have run into a problem. In Sean Carroll's book 'Spacetime and Geometry', he states what the tensor form of the Lorentz force law is in Equation 1.106. However, whenever I try to verify the equation, I keep getting an extra negative. Has anyone worked this problem or...
  19. P

    Integral - Algebraic Manipulation?

    Homework Statement \int \frac{x}{x+d}dx The Attempt at a Solution I tried parts and that turned out horribly so I fired up maple. First move it makes is 'Rewrite Rule'. I've never heard of a rewrite rule but I supposed it could be some algebraic massaging. I ended up looking at it...
  20. A

    Algebraic Manipulation of Euler's Identity Leads to a Strange Result

    I was playing around with Euler's identity the other day. I came across something that seems contradictory to everything else I know, but I can't really explain it. I started with e^{i\pi} = -1. I rewrote this as ln[-1] = i\pi Multiplying by a constant, we have kln[-1] = ki\pi...
  21. E

    Question about dream manipulation

    I m at loss where I would post this question but is there a way to manipulate a person's dreams etc using waves. You know where this might be going to...
  22. D

    Symbolic Vector Manipulation Software?

    I would like to do something like a derivative with respect to a vector or really anything involving a vector (of known dimension, but unknown values) going in and a vector coming out: x= 4 by 1 vector A = 4 by 4 matrix diff( Transpose(x) * A * x, x) should return (1/2)*A*x Is there...
  23. R

    Pascals Triangle Manipulation

    Here is the manipulation of Pascals Triangle. I'm trying to figure out a way to represent these rows in terms of a combination. Check it out... 1 1 1 1 4 1 1 9 9 1 1 16 36 16 1 1 25 100 100 25 1 . . .
  24. M

    Simple Algerbraic Manipulation is Confusing Me

    I'm working on a chemistry problem and I'm trying to follow the derivation for % ionization (of a weak acid or base) but I can't seem to understand how rearrangement of eq. 6 results in eq. 7. In more general terms, I started with the Hendreson Hasselbalch equation: pH = pka + log(A-/AH)...
  25. F

    How can I prove this algebraic manipulation equation?

    Homework Statement I need to prove the following equation is true, given that a + b + c = 0: a^2/(a^2 - b^2 - c^2) + b^2/(b^2 - a^2 - c^2) + c^2/(c^2 - a^2 - b^2) = 3/2 Homework Equations a + b + c = 0 The Attempt at a Solution I wasn't sure what to do at first, so I tried cross...
  26. N

    Help With String Manipulation In C

    Homework Statement I need to write a function which will replace any occurence of "cmpt" with "XXXX" in a string. The Attempt at a Solution I am still confused with pointers and string manipulations. Here is what I have so far but I'm lost. http://rafb.net/p/2h8fJ210.html
  27. S

    Solve for Intensity: Easy Formula Manipulation for Finding Intensity

    I'm trying to find the intensity of something. I know the equation is B = 10log(I/Io) But how to I solve for I? What would the equation be? For some reason I can't make it work.
  28. J

    Any help with an electrostatic field manipulation design or suggestions?

    I have about a year of electronics background, but what I'm trying to make is still a bit daunting for me. I want to build a device that creates a very high voltage electrostatic field like a van de graff generator and then input to this field variable frequencies from an electric keyboard...
  29. P

    MATLAB Huge data manipulation in Matlab

    I have about 5000 matrices which are all in excel. I need to put them all in Matlab so I can use them in programs. Every one of the 5000 matrices will be in its own excel sheet and they will all be saved in a folder. I don't mind reading them one by one in Matlab, but the thing I am having...
  30. U

    Rearranging for x in Algebraic Manipulation Homework

    Homework Statement Hey I need to rearrange the following, and find x in terms of G, M, m, r \frac{{GM}}{{x^2 }} = \frac{{Gm}}{{\left( {r - x} \right)^2 }} 2. The attempt at a solution I haven't manged to get far with this problem as I am confused about the powers of x and how to manage...
  31. R

    Algabreic Manipulation of Sigma Notation

    Even though this question deals mostly with arithmetic and geometic series, this notation is used in linear algebra and differential geomety quite a bit so I will inquire of this matter here. What are the rules for algabreically dealing with sigma notation. When you change the value of an...
  32. N

    Mathematica Simple tensor manipulation in Maple or Mathematica

    I know that this might not be the best forum for the question but I am sure people here can help. I want to do some simple tensor contraction using Maple or Mathematica. The calculation is simple but extremely long. All I want is to teach Maple/Mathematica to do tensor contraction without...
  33. H

    Manipulation of Cartesian Tensors

    I have a question relating to a particle rotating around a point with velocity u = \Omega \times r, where \Omega is the angular velocity and r is the position relative to the pivot point. I need to prove that the acceleration is given by, a = -\frac{1}{2} \nabla [(\Omega \times r)^2] I...
  34. tandoorichicken

    How to Find the Null Space of a Matrix in C?

    any tips on how to implement a way to find the null space for a given matrix?
  35. L

    Solving Formula Manipulation Problem: Block B Strikes Floor at t1

    I am trying to manipulate a formula to get a known answer — only I am not getting it: The necessary information: Two small blocks, each of mass m, are connected by a string of constant length 4h, with negligible mass. Block A is placed on a smooth tabletop (no friction), and block B hangs...
  36. K

    Algebraic manipulation of identity matrix

    I was doing a few practice questions and was a bit confused about how the solution manual manipulated the I identity matrix. For example, Just say you had the following I - 2A = B where A and B are 2x2 matrices. B is given, but we need to find A. Therefore, shouldn't it be -2A =...
  37. M

    Zero-Point Energy Manipulation

    This might be a stupid question, but I've been reading a lot about zero-point energy and I still don't fully understand what it is. I've always had a dream of coming up with plans for a gravity manipulator that could reduce an objects mass to absolute zero creating a black hole, but sustaining...
  38. J

    Gene Manipulation: Potential Positive and Negative Impacts

    In the future ...would the impact of gene manipulation be positive or negative? If there are limits to the way the technology is used, it would be positive right? We could cure a lot of diseases...
  39. S

    Gravity Manipulation: Can It Be Done? Research for Hard SF World

    This topic is a little "out there" but what are you thoughts on this being possible someday? I'm doing some research for my Hard SF world and don't want to use anything unplausible. If possible any guesses as to if it'd only need power to turn it on, off and change altitude, not to maintain...
  40. S

    Photon Manipulation: Can We Redirect and Teleport?

    1.) Is it posible to somehow create some FIELD that redirects light when passing thorough? 2.) I heard that there were some experiments with photon teleportation - is there some method to teleport photons from random place (any place; without apparature placed there; only apparature is the one...
  41. C

    Genetic Manipulation: Balancing Morals & Application

    What do you think of genetic manipulation in any form, qunatity, or application? Please, try to create an equilibrium of morals and application as to AVOID A FLAME WAR! Thanks.
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