What is Zero: Definition and 1000 Discussions

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. gracy

    How electric field lines going out from surface is zero?

    in the video above the instructor explains from time 8:22 to 8:55 that how and why electric field lines going out from the surface which do not enclose charge is zero but I don't understand then why not electric field lines going out from the spherical surface ( enclosing charge) is...
  2. A

    Does Zero Net Energy equal Zero Energy?

    It seems that some of the new "free lunch" cosmological models promote the idea that if the universe has zero net energy, zero energy was required to create it. However, a closed system can have tremendous potential energy but zero net energy, so the idea seems questionable to me, even if the...
  3. A

    Gauss' Law: Charge enclosed zero = E field zero?

    Homework Statement A cylindrical shell of radius R and length H has its charge uniformly distributed on its curved surface Find the electric field at a point P from the axis, a distance r away, measured radially outward from the midpoint of the shell such that R>r Homework Equations φ =...
  4. F

    Finding the Equilibrium Position for Three Charges

    Homework Statement A charge of 2.21E-9 C is placed at the origin, and a charge of 3.78E-9 C is placed at x = 1.60 m. Find the position at which a third charge of 2.94E-9 C can be placed so that the net electrostatic force on it is zero. Homework Equations Coloumb's law The Attempt at a...
  5. Brandon Hawi

    Cross Product of Parallel Vectors is the zero vector (why?)

    Hello, PF! I had a quick question that I hoped maybe some of you could help me answer. The question is simple: Why is the cross product of two parallel vectors equal to the zero vector? I can see this easily mathematically through completing the cross product formula with two parallel...
  6. Earnest Guest

    Why do so many galaxies in a cluster have near zero velocity

    I'm looking at a velocity chart of the Coma Cluster: And the question occurred to me: why are there so many galaxies that have a zero velocity (relative to the core of the Coma Cluster which is roughly 7,000 km s-1)? At a distance of a Mpc or two you would expect to find galaxies at the peak...
  7. Mr Davis 97

    Choosing when intitial velocity is zero

    I have a quick question about when we can define the initial velocity to be zero. For example, in projectile motion problems, even though we know that projectile is originally at rest in a cannon, we assign the initial velocity to be some number that we can work with. However, for problems...
  8. pyctz

    Why is the electric field zero outside of depletion region?

    why do electric field is zero out side of depletion region?
  9. Julio1

    MHB Zero Integral Implies Zero Function

    If $h: \Omega\to \mathbb{R}$ is continuous and $\displaystyle \int\limits_{B(x_0,r)}h(x)\, dx=0$, for all $B(x_0,r)\subseteq \Omega$, then $h(x)=0, \, \forall x\in \Omega.$Hello MHB, is an problem that I don't solve :(. Help me please or any hints :). Thanks.
  10. C

    Can someone zero in on one person's frequency?

    I'm new, so first let me just apologize if I ask a stupid question! I recently had a bad breakup with my boyfriend, and he pretty much told me I was crazy and he was going to make sure I got some help. I've been experiencing some strange things in my life since he said that, and my family now...
  11. T

    Is the Total Energy of the Universe Really Zero?

    I saw a video by a physics writer who said that the beginning of the universe was like digging a hole: the hole and the pile of dirt cancel each other out. This of course means that the ground, so to speak, before the digging was zero. But where is the "hole" once the universe began? I asked...
  12. G

    Zero Acceleration in Running and in a Car

    1) While running with a constant velocity ; how do we consume energy? : Only due to vertical movement of our bodies, right? 2) When driving a car in a constant velocity; how this car could consume energy? It does not move upright-downright (in a very straight road).
  13. fricke

    What if Planck Constant is Zero? Effects in Quantum Explored

    What is the effect in quantum if Planck constant is zero? Here are some points that I could think of: if Planck constant is zero, the Heisenberg Uncertainty Principles will become zero, therefore either momentum or position of a particle can be known exactly. if Planck constant is zero, both...
  14. mgkii

    Energy at zero axis in an Electromagnetic field?

    Can someone correct my understanding on electromagnetic waves please; I've clearly got the wrong end of a stick somewhere, but can't figure out where my misunderstanding is! Thanks. If I draw a classic EM wave with the electric field on the up and down axis and the magnetic field at right...
  15. T

    MHB Outer measure exclusion of zero set question

    I've just started self-studying measure theory by reading Pugh's Mathematical Analysis. I'm trying to understand his argument for why the exclusion of a zero set does not change the outer measure: $m^*(E\setminus Z)=m^*(E)$: (Pugh's arugment): Let $Z$ be a zero set, $E\subseteq\mathbb{R}$, and...
  16. Nathanael

    Zero experience with proofs, does this count?

    Homework Statement I'm trying to show that ##\Sigma_j(\vec a_j \cdot \vec B)=\vec B\cdot\Sigma_j(\vec a_j)## (I need this to be true to derive some angular momentum properties.) 2. The attempt at a solution Let's say that in some coordinate system we can express the vectors as ##\vec...
  17. C

    Do wave functions go to zero at ~ct?

    Suppose you have a free election and you make a measurement of its position r_0 at time t = 0. You then wait some time t required for the wave function to evolve out of its collapsed eigenstate. The electron now supposedly has a wave function expanding to infinity in all directions, albeit with...
  18. Q

    Negative zero error in vernier calipers

    Homework Statement Hi, with regards to the negative zero error , do we read the vernier scale from the left or from the right? In this case, should it be -0.04cm or -0.06cm? Thank you !
  19. slatts

    Do geodesics of measure zero allow past-eternal inflation?

    Assuming that the expectation that all matter and energy are quantized is correct, I'm making a further assumption that "random" means something like, "hypothetically predictable, but only by means at least possibly impractical on any permanent or general basis whatsoever, such as enumeration...
  20. G

    What happens if the normal reaction force is less than zero?

    Homework Statement why the object will fall of when the normal reaction force is less than zero ? P/s : the normal reaction force is in downward direction... How if if the normal reaction force is less than zero ? the normal reaction is in upward direction ? Homework EquationsThe Attempt at a...
  21. S

    Simple Harmonic Oscillator Zero Probability Points

    Hi, What is the physical meaning of zero probability of finding a particle in the square of the Quantum SHO wave function? the particle is supposed to oscillate about the equilibrium position, how would it go from an end point to the other end point without passing by certain points? Could the...
  22. A

    What is the difference between zero and multiple quarter wave plates?

    Hello I have a quarter wave plate for 550 nm but i can't determine which it is a zero quarter wave plate or multiple. How can I find m in this formula : delta phase =m*2 Pi +Pi/2 ? Thank you.
  23. Samurai44

    Zero Potential Level: Excited State or Not?

    Greetings , Is the zero potential level ( not the ground state) considered as an excited state ? and why the ground state isn't an excited state ?
  24. Nemoto

    Is a photon of dimension zero?

    I have read that the elementary particles of the Standard Model have dimensions 0. Is this the case or not? I have read on this site relevant answers to similar questions, but have not found them to be very clear. If it is the case, surely much of quantum weirdness is thereby explained: after...
  25. K

    U(2) charge commutator being zero

    Hi, For SU(2) I can have that all Noether charges commute with one of the charges as one of the generators of the Lie algebra is the identity. Can somebody explain me how this is related to the properties of SU(2)? Charges can be considered to be generators of the transformation. So if this...
  26. R

    Satisfying Dirac equation, how to make equal to zero.

    Homework Statement Homework Equations Dirac equation: $$(\gamma ^{\mu}\rho_{\mu}-mc)\psi=0$$ The Attempt at a Solution If we multiply out the Dirac equation by inserting all it's components we get: which if I've multiplied it correctly gives $$ \begin{bmatrix} \frac{E}{c}-mc\\ 0 \\...
  27. R

    Zero order hold -- Discrete control systems

    I have some questions related to how a discrete control system is designed. One method is to design the controller in the continuous time domain, arriving at a transfer function (in the s-domain). After that, a transfer function for the ADC system must be taken into consideration. I will suppose...
  28. Walteholic

    Will absolute zero change with pressure?

    Say we are talking about an ideal gas. According to ideal gas law (PV=nRT), assuming the gas is now at absolute zero, if we further decrease the pressure of the environment, while keeping the container volume constant, will the gas goes under absolute zero? I wasn't an expert in Physics so...
  29. W

    Is it possible to achieve absolute zero?

    Is it possible to achieve absolute zero?
  30. A

    When is the rate of change of momentum equals zero ?

    When is the rate of change of momentum equals zero ?
  31. S

    Haidinger fringe (interferometer at zero path difference)

    Homework Statement A Michelson interferometer is illuminated with a laser with a wavelength of 514.5nm. A Haidinger fringe pattern is photographed with a lens of focal length 55mm. The diameter of the two adjacent circular fringes in the image are 1.53mm and 2.62mm. How far would the mirror...
  32. Atlas3

    Is Zero Discrete? - Math Explained

    Is zero discrete?
  33. X

    What exactly is moment, and when is it zero?

    I've been dealing with the concept of moment this whole year, in statics/dynamics but I've never really completely understood it, just rather memorized it. What I think moment is: If some point on a body has moment, then this means it wants to rotate. So moment is essentially what causes...
  34. M

    If A is triangular and no entry on the main diagonal is zero

    A is invertible... How give me the proper explanation...
  35. E

    Is xTAx always non-zero for a real, symmetric, nonsingular matrix A?

    Basic question, I think, but I'm not sure. It is a step in a demonstration, so it would be nice if it were true. True or false? Why? If A is a real, symmetric, nonsingular matrix, then xTAx≠0 for x≠0.
  36. A

    Ricci tensor equals zero implies flat splace?

    Hi, my question is the title, if Ricci tensor equals zero implies flat space? Thanks for your help
  37. Nate810

    Show that the expectation value of momentum is zero

    Homework Statement Demonstrate that the expectation value of momentum (p) for the wave function: ψ(x)∝e^(-γx) when x>0, ψ(x)=0 when x<0. Hint: Pay special attention to the discontinuity at x=0.[/B] Homework Equations <p>=<ψ|p|ψ>=∫dxψ*(x)[-iħ∂/∂x]ψ(x) from -∞ to ∞. [/B]The Attempt at a...
  38. Brynhildur

    What is the acceleration and tension in this inclined pulley system?

    I have an inclined pulley with inclination 30°. There is mass A on top of it equals 2 kg. And over a frictionless pulley there is a mass B with weight 0,83 kg. The text says that the coefficient of friction is 0,18 between mass A and the incline. I need to know the acceleration. and I also have...
  39. A

    Zero backlash worm gearing for pan and tilt

    I am designing a Pan and tilt drive for with stepper motor as prime mover. We need a zero backlash worm drive to transmit 70 Nm. motor torque is 1 Nm. What are the options.. position accuracy is 0.1 deg. thanks
  40. I

    Tangential force acting on a skier has been set to zero?

    Can anyone explain why sum of Ft has been set to be = 0? The slope is smooth so no frictional forces act but by setting it to 0 they are neglecting the component of the weight along the slope? Having said that, this is a curved slope and not a straight one so does the component of the weight...
  41. K

    Metric tensor with diagonal components equal to zero

    Hello, Let ##g_{jk}## be a metric tensor; is it possible for some ##i## that ##g_{ii}=0##, i.e. one or more diagonal elements are equal to zero? What would be the geometrical/ topological meaning of this?
  42. K

    Calculating log liklihood: Zero value of likelihood function

    Hello, I am analysing hydrology data and curve fitting to check the best probability distribution among 8 candidate distribution. (2 and 3 parameter distributions) The selection is based on the lowest AIC value. While doing my calculation in excel, how is it suggested to treat very low (approx...
  43. C

    Find elements of a matrix such that its determinant is zero

    Homework Statement Please see the attached file if my inline insertion does not work. Homework Equations ##det(A)=det(A^T)##[/B]The Attempt at a Solution Since a matrix has a determinant of zero only when it's columns are linearly dependent, we look for a set of points [x1 x2] such that...
  44. terryds

    Limit of tan(x)/x as x approaching zero

    The hint I found in http://math.stackexchange.com/questions/448207/how-to-prove-that-lim-limits-x-to0-frac-tan-xx-1#answer-448210 limx→0(tan(x) / x)= limx→0( (tan(x)−0) / (x−0)) = limx→0 ( (tan(x)−tan(0) ) / (x−0) )=⋯ Then, I don't know how to continue it.. What identity is used ? I don't see...
  45. H

    MATLAB How to plot a continuous zero plot in Matlab?

    In the plot command below x=1:5:100 plot(x,y,x,0) one plot is noncontinuous zero plot. How can I plot a continuous zero one?
  46. A

    MHB Ideals of Zero Locus of function is generated by function.

    Let $f(x) \in k[x]$. Show that $\mathcal{I}(\mathcal{Z}(f)) = \langle f \rangle$ if and only if $f$ is the product of distinct linear factors in $k[x]$. Here, $\mathcal{Z}$ is the zero locus and $\mathcal{I}$ is the ideal generated. This is a question from Dummit and Foote Chapter 15.1.19.
  47. sk1105

    Why is the electroweak cross-section zero at Z boson mass?

    The Standard Model formula for the cross-section of ##e^+e^-\rightarrow\mu^+\mu^-## is made up of 3 components: QED interactions, weak interactions, and electroweak interference. I understand the behaviour of the QED part, and the resonance that occurs in the weak part at ##\sqrt{s}=M_Z##, but...
  48. RicardoMP

    Gyrocompass motion: Zero torque in the free axis

    Hi! At the moment I'm studying rigid body motion, more specifically, the gyrocompass. As you can see in the attached picture (Introduction to Mechanics -Kleppner-Kolenkow-Chap.7), the gyrocompass rotates about the z axis and the spin angular momentum is reoriented towards the z axis, creating a...
  49. J

    Zero Cross Section for e-+ e+ -> γ

    Homework Statement I am making an old exam of a particle physics course, and i know how to calculate the cross section for example for bhabha or moller scattering. now one of the questions on the old exam is: Explain why e-+ e+ -> γ is zero, but i am not sure why this is, can someone explain...
  50. P

    Is the reciprocal of infinity, zero?

    Thanks!
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