Zero Definition and 1000 Threads

Gonzalo Raúl Barrios Castro (born April 17, 1995), known by his gamertag ZeRo, is a Chilean former professional Super Smash Bros. player and streamer. He was considered the best Super Smash Bros. for Wii U player in the world throughout his career, with a record-breaking 56 consecutive tournament wins in the game from November 2014 to October 2015, including high-profile tournaments such as EVO 2015 and The Big House 5. Prior to the release of Super Smash Bros. for Wii U, he was a top ranked Super Smash Bros. Brawl and Project M player. His best known characters are Diddy Kong in Super Smash Bros. for Wii U, Pit in Project M, Meta Knight in Brawl, and Fox in Melee. He is the only player to have earned more than US$100,000 playing Super Smash Bros. for Wii U competitively.
Barrios retired from professional competition in July 2020 following allegations of sexting two minors in 2014, which also led to Barrios' sponsors cutting ties with him. Barrios later publicly admitted to the allegations.

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  1. P

    Gravitational field strength equals zero?

    There is a point between Earth and moon where the gravitational field strength is zero. What about the same thing with three or more objects? With three of more objects, is there always at least one point where the gravitational field strength due to the objects is zero? Why / Why not?
  2. E

    Can We Make a Summation Zero When Coefficients are Not Equal?

    Hello, I have the following summation: \sum_{l=0}^Lb_l\exp\left(-j\frac{2\pi}{N}kl\right) If b_1=\cdots b_L=b then by making L=N-1 the above summation will be zero. Now, if the coefficients are not equal, can we make the summation zero, and how? Thanks
  3. S

    Speed dropping to zero when landing during a fall

    Homework Statement When a box falls in a vacuum, it accelerates at 10m/s^2 and if the mass is 10kg, then it has a net forfeit of 100N. As it falls for 10s, it has a final speed of 100m/s. At the moment of impact, there is a reaction force of 100N acted upon the box by the earth. But since the...
  4. A

    What is the physical interpretation of zero divergence?

    When a vector field representing a physical quantity (e.g. B) has ∇\cdotB = 0 what is then the physical interpretation of this? Some people have said that the field doesn't diverge away from anything, but as far as I can tell magnetic field can easily get weaker and weaker the further you go...
  5. C

    Integral of exponential distribution from zero to infinity

    Homework Statement here's a problem from my assignment let integral p(x)dx=Ae^-(x/a) dx...(1) find value of A, that makes integral p(x)dx=1; and find mean x so that integral x*p(x)dx=a...2) Homework Equations now to solve the first one i found out A to be (-1/a*e^(x/a)) but...
  6. S

    What is its velocity equal to zero?

    The function of a bus as a function of time is presented below. At what time is the bus traveling with the greatest velocity? What is its velocity equal to zero? Is there a time where the velocity is negative?
  7. R

    What happens to matter near absolute zero

    I'm trying to figure out why things happen to objects placed in environments near absolute zero. so let's take an ice cube. In a freezer it will remain stable, I'm guessing because the atoms that make up the ice cube will bounce off atoms in the air that are roughly similar in energy to the...
  8. C

    Can chemical reactions take place at absolute zero?

    Title says it all. I've been wondering. The argument is, is there a minimal temperature required for any chemical reaction to reach its activation threshold? Or would the energylessness of the atoms prevent bonds from forming (or dissolving, I guess)? Conrad.
  9. D

    Why electric field is zero inside a conductor?

    1.Why electric field is zero inside a conductor? Can anyone explain it with Gauss's law and without Gauss's law? 2.Is it possible to create electric field inside a conductor? If so,how and in which condition it is created?
  10. L

    Is the signature of this matrix zero?

    Given are two square matrices of the same dimension, M and N. M is symmetric. N is non singular. From M and N form the symmetric matrix, M N N* 0 Where N* is the transpose of N. Is the signature of this matrix necessarily zero? Counterexample?
  11. Q

    A theorem about identically zero potential function

    I found this theorem in my book on optics which I cannot prove: if f is a potential function in the plane, which is zero along a curve and such that the normal derivative to the curve is itself zero at any point along the curve, then f is zero in the whole plane. Can you give me a reference on...
  12. R

    A ZERO Curl and a ZERO divergence

    A ZERO Divergence Vector Field There is theorem that is widely used in physics--e.g., electricity and magnetism for which I have no proof, yet we use this theorem at the drop of a hat. The theorem is this: Given sufficient continuity and differentiability, every vector function A such that...
  13. shreyakmath

    New formula that can divide by zero to give an integer

    New formula that can divide by zero to give an integer! Does anybody here know about the Bhartiya New Rule of Fraction(BNRF)? It is capable of dividing by zero! In most elementary terms, we know that division is successive subtraction. For example 6 divided by 3 is 2 because 3 can be...
  14. E

    How does impulse relate to energy when the net force is zero?

    Work is defined as force times displacement. When the force is applied on an object which does not move, or is applied perpendicular to the direction of motion, the work done is zero. So let's say I hold an object with a mass of 1 kg still in the air for 10 seconds. Because the object does...
  15. Femme_physics

    Zero Point Switching: Is It Possible?

    I found this scheme of a zero point switching in a notebook http://img402.imageshack.us/img402/1313/schemew.jpg I'm a bit confused. Look at the SCR on the right with the wide-arching gate... is it really possible to connect an SCR gate like that?
  16. Z

    Curl of the dipole moment vector - why is it not always zero

    I'm confused about what polarization of a dielectric does to its electrical properties. It is clear to me that polarization causes every little atom to get a tiny dipole moment. A measure of the polarization is therefore P = dipole moment per unit volume. However, what is really a dipole moment...
  17. aleemudasir

    Wavelength of matter waves at speed equal to zero.

    According to de-broglie's equation λ=h/p, so a/c to this equation what would be wavelength of particle at zero speed?
  18. U

    Proving (1+x)^n approaches 1 + nx when x goes to zero

    Homework Statement I've heard this affirmation in an gravitation lecture. I thought it was interesting and decided to check it out. It turns out to be true so I decided to prove it. I'm not a mathematician so proving stuff is not my department. Still I try to do some proofs just for fun. I...
  19. P

    What is infinity to the power of zero?

    Homework Statement Hi everyone, I'm just wondering if someone could please clarify for me what infinity to the power of zero is? I seem to be finding conflicting opinions about this online. Is it '1' or 'not defined'? Thanks! Homework Equations The Attempt at a Solution
  20. C

    Relating Point Charges for a Net Zero Force

    Point charges q1 and q2 lie on the x-axis at points x = -a and x = +a, respectively. (a) How must q1 and q2 be related for the net electrostatic force on point charge +Q, placed at x = +a=2, to be zero? (b) Repeat (a) but with point charge +Q now placed at x = +3a=2. Can someone help me...
  21. A

    Demonstrating that (im τ) \cap (ker τ) is the Zero Space

    Consider a linear operator τ:V→V (where V is finite-dimensional) such that rk τ2=rk τ. Show that (im τ) \cap (ker τ) is the zero space. Here's where I am: Its easy to see that I am τ=im τ2, since it is a subspace with the same dimension. I also know that if (im τ) \cap (ker τ) contains a...
  22. K

    Motion - zero velocity but still having acceleration

    Motion -- zero velocity but still having acceleration What would be a example of a body having zero velocity but still having acceleration, except the example of a body projected vertically upwards and at the highest point it has no velocity but an acceleration equals 'g'?
  23. P

    Zero gaussian curvature implies developability proof

    Homework Statement Hey guys, I have a small question on a proof in Struik's Differential Geometry book. It concerns the proof that all surfaces with K = 0 (gaussian curvature zero) are developable, i.e. all surfaces with K = 0 are ruled and the tangent planes along the rulings are parallel...
  24. P

    MATLAB FFT Zero Padding Issue - Matlab Code Help

    Hello, I have a simple cosine f = 50Hz. When I generate Matlab code to produce 1/2 second of this signal and take the FFT, the response correctly shows a spike at 50 Hz. However, when I bracket the signal with 1/2 seconds of zeros on either side, the frequency response is showing a spike at...
  25. H

    Is Zero a Concept or a Real Number?

    Hello, I'm sorry if I'm posting in the wrong place. As you can see this is my first post and there's something that's been irking me so much that I need clarification. I'm sure some people will be disgusted at some of the logic, but I just want clarification. I do realize that it's all...
  26. Useful nucleus

    Zero Point Energy: Harmonic Oscillator vs Rigid Rotator

    The harmonic oscillator and the rigid rotator are traditional examples in any quantum mechanics text. The former can represent the vibrations of a diatomic molecule while the latter can represent its rotation. By solving the time-independent Schroedinger equation for the two systems, one...
  27. 7

    What is the significance of the zero vector in a vector space?

    Ok this is from a tutorial I am redoing again. V5 = {(x, 1) | x ∈ R}, (x1, 1) ⊕ (x2, 1) := (x1 + x2, 1), c.(x, 1) := (cx, 1). I understand that there exists a zero vector in this vector space, that comes in the form of (0,1). What I do not understand is why that is considered a zero...
  28. K

    Where Electric Field Strength + Potential are Zero?

    Homework Statement draw equipotential lines and electric field lines for the following arrangements of charges: a) +4 at (3,5) b) +4 at (3,5) and +4 at (6,5) c) +4 at (3,5) and -4 at (6,5) d) +5 at (3,5) and -2 at (6,5) e) +4 at (3,4), (7,4), and (7,7) f) +4 at (3,4) and (7,4) and -4 at...
  29. J

    Understanding the Zero Energy Principle of the Universe

    I have heard people talk about the principle that the total energy of the Universe is zero. Here is my understanding of the principle. The positive rest mass energy of each particle is balanced by the negative gravitational potential energy between it and every other particle in the...
  30. james.goetz

    Will space always expand when the space has vacuum energy and zero mass?

    I am examining various models of eternal inflation and I want to double check one of my assumptions, which is that space always expands when the space has vacuum energy and zero mass. Is this correct? Will space always expand when the space has vacuum energy and zero mass? Thank you.
  31. Z

    Why wire experiences force in magnetic field, when net charge is zero.

    Homework Statement In a current-carrying wire, the total net charge in the metal is zero. Why does the wire experience a force when placed in a magnetic field? Homework Equations The Attempt at a Solution The reason for the force is the motion of the electrons, not their...
  32. H

    How does this integral come out to be zero?

    The question is: ∫ (y(4-x^2-y^2)^(3/2) dy with y=(-sqrt(4-x^2)) to sqrt(4-x^2)) dy I evaluated it online and it came out to be zero which was quite astonishing since both limits of y are not the same. The limits are the additive inverses of each other. Does this mean that regardless of the...
  33. J

    What happens when net torque is zero?

    I know that net torque is the sum of torques in a given situation. So take this as an example: If I used a wrench to turn a nut counterclockwise and it succesfully moves, is the net torque going to be non-zero? If so, then can someone please give me an example where the net torque can be zero...
  34. T

    All Solution of Diff. Eq. Tend to Zero

    Homework Statement Assume that a,b,c are all positive constants. Show that all the solutions of: ay'' + by' + cy = 0 tend to zero as x goes to infinity. (I presume that y is implicitly assumed to be a function of x) The Attempt at a Solution This is what I have to far: We write...
  35. H

    (dis)prove this function does not have a limit at zero.

    Homework Statement The function g:ℝ→ℝ defined by "g(x) = 0 for x being rational and g(x) = 1 for x being irrational" does not have a limit at zero. Homework Equations I have to use the definition of the limit of a function at a point--I can't use the sequential criterion this time. So...
  36. M

    When is the magnetic flux on a section of a closed surface equal to zero?

    Homework Statement When is the magnetic flux on a section of a closed surface equal to zero? A. When the magnetic field is in the direction opposite that of the section’s area vector. B. When the magnetic field is in the direction of the section’s area vector. C. When the magnetic field...
  37. K

    Measure Zero Sets: Proving \sigma(E) Has Measure Zero

    Homework Statement Let \sigma (E)=\{(x,y):x-y\in E\} for any E\subseteq\mathbb{R}. If E has measure zero, then \sigma (E) has measure zero. The Attempt at a Solution I'm trying to show that if \sigma (E) is not of measure zero, then there exists a point in E such that \sigma (\{e\}) that has...
  38. A

    Linear Transformation R2->R3 with 'zero' vector

    Homework Statement Is T(X,Y)->(X,Y,1) a linear transformation? where X and Y are defined R2 column vectors. Homework Equations Attempt to prove T(cX+Y)=cT(X)+T(Y) Consider T(cx1+y1,cx2+y2)->(cx1+y1,cx2+y2,1) The Attempt at a Solution RS=cT(x1,y1)+T(x2,y2)->c(x1,y1,1)+(x2,y2,1)...
  39. QuarkCharmer

    Is the zero vector always in the span of any set of vectors?

    Homework Statement Homework Equations The Attempt at a Solution It's not so much a homework problem as it is something I was wondering. Our book is horrible, and does not explicitly state that the zero vector is always in the span of two vectors. If I am understanding things right: if v...
  40. M

    Proof that if a polynomial has a complex zero it's conjugate is also a zero

    Homework Statement If P(x) is a polynomial with real coefficients, then if z is a complex zero of P(x), then the complex conjugate \bar{z} is also a zero of P(x). Homework Equations Book provides a hint: assume that z is a zero for P(x)=a_{n}x^{n}+a_{n-1}x^{n-1}+...+a_{1}x+a_{0} and...
  41. K

    Zero Gravity: ISS Orbit & Neil Degrasse Tyson

    I read in a physics textbook that it is not zero gravity in ISS but the fact that the ISS is in "free fall" makes astronauts float around. They do not feel any normal force because the vehicle they are in are also in free fall along with them. Then I watched Neil Degrasse Tyson talk about bone...
  42. D

    Mathematica Mathematica - Set zero offset for Frame origin?

    I have a Plot using Frame, and AxesOrigin set to a convenient value. The plot process offsets the physical origin of the Frame so that the specified AxesOrigin is just inside the Frame border - ie there is an offset introduced for both axes. Is there a way to tell Mathematica not to set any...
  43. A

    MHB How Does Zero Short Film Inspire Change Through Storytelling?

    see this http://www.zeroshortfilm.com/
  44. C

    Work & Zero Work in High School Physics Course

    Hi, I am taking a high school physics course and I just need a little help grasping the concept of zero work and whether or not it applies to this situation... The question reads: A child on a sled (having a combined mass of 47.0kg) is pulled by a force directed along a rope that make a 45°...
  45. N

    Where is the magnetic field zero between two antiparallel current-carrying wires

    Homework Statement Consider two parallel conducting wires along the direction of the z axis as shown below. Wire 1 crosses the x-axis at x = -2.60 cm and carries a current of 2.00 A out of the xy-plane of the page. Wire 2 (right) crosses the x-axis at x = 2.60 cm and carries a current of...
  46. M

    Entropy: Why & How Does C_V Go to Zero?

    Entropy is defined by: S(A)=\int^{T_A}_0C_V\frac{dT}{T} where A is state of the system in which temperature is T_A. When T_A\rightarrow 0 and C_V must go to zero. Why? And how fast does it go?
  47. I

    Why is the electric field inside a hollow conductor zero?

    Homework Statement The electric field is zero within the conductor because the charges are all at rest in an electrostatic situation. But the electric field inside a cavity within the conductor is not necessarily zero because it isn't part of the conductor, as my book says. Then i encountered...
  48. R

    Why does voltage drop to zero over a resistor?

    How I am currently imagining it: In a simple circuit with just a battery and resistor the voltage of the battery sets the electrons off through the circuit at some speed and that speed is proportional to the voltage. The electrons then encounter the resistor. From these forums my...
  49. A

    Cauchy sequence in Q not converging to zero.

    I have the following exercise: Let s_n be a cauchy sequence in Q(rationals) not converging to 0. Show that there exists an e(epsilon) >0 and a natural number N such that either for all n>N, s_n > e or for all n>N, -s_n >e. I know that since Q is not complete, we cannot assume that there...
  50. J

    Qube root of 2, zero of second order polynomial

    How do you prove that there does not exist numbers a,b\in\mathbb{Q} such that 0 = a + b\sqrt[3]{2} + \sqrt[3]{2}^2
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