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. V

    Change in temprature is zero. what about change in internal energy?

    change in internal energy is a function of temperature. So if there is no change in temperature then there should no change in internal energy. But consider this example. work done in process work done(W)= nRT*ln(P1/P2) (Δ)T=0; so it's isothermal) heat supplied(Q)=0 (No heat is supplied...
  2. B

    Weird question about dividing by zero

    Ok let a and b be non zero numbers (\frac{a}{b}) / (\frac{1}{0})=0 But shouldn't that be undefined since you would get a fraction like this \frac{1}{0} which isn't allowed. Since it got us to a "wrong" answer, that would mean our assumption was wrong. Please tell me where I went wrong.Not...
  3. dwdoyle8854

    Why Does Work Equal Zero in Some Situations?

    Homework Statement Im having difficulties with this on several problems. I understand work to be zero when there is either no displacement, no forces acting parallel to object or if friction and air resistance is not considered. Here is a simpler problem where i get the right answer if i...
  4. A

    Field inside conductor-is it zero every where?

    field inside conductor-is it zero every where?? consider a perfectly spherical neutral conductor.suppose a few electrons with net charge q is deposited on it.the electrons will spread out[due to mutual repulsion] and distribute themselves in such a way that the net field inside the sphere is...
  5. S

    Proving the Limit of Zero Using Epsilon-Delta Method

    Epsilon-Delta proof of zero?? Homework Statement Write an epsilon delta proof for the limx\rightarrow2 0 = 0. The Attempt at a Solution This is for my discrete math class. I know how to do limit proofs with a variable, like x or x2, but it seems that this is obvious that the limit...
  6. P

    Why is integral of 1/z over unit circle not zero?

    Ok I can do the integral and see that it is equal to 2∏i, but thinking about it in terms of 'adding up' all the points along the curve I feel like every every point gets canceled out by its antipode, e.g. 1/i and -1/i.
  7. P

    Why does gravitational Laplace's equation equal zero?

    I'm struggling here so please excuse if I'm writing nonsense. I'm trying to understand how, for a gravitational field, Laplace's equation (I think that's the right name) equals zero in empty space. I understand that the gravitational potential field, a scalar field, is given by...
  8. A

    Zero-Frequency Modes: Quantum Shape-Phase Transitions in Nuclei

    I'm dealing with the problem of zero frequencies in many body system and it's relation with symmetry breaking. I would like to examine this connection in the case of quantum shape-phase transition in nuclei. I've studied this technique (golstone theorem) in field theory as well as Particle...
  9. G

    Why is there close to zero potential difference in conductors in a circuit?

    This is why I think this is the case, I can't come up with any other reason and have been researching all over the place. I do have a knowledge of circuits, I'm doing an electronic engineering course, but the reasoning has never been explained, as if it's unnecessary to understand why, but I am...
  10. J

    Gibbs free energy change at constant pressure is zero?

    gibbs free energy change at constant pressure is zero?? IS gibbs free energy change at constant pressure zero? ΔS = q / T. At constant pressure q = ΔH so ΔS = ΔH / T So ΔG = ΔH - ΔH/T . T = 0 I think i am wrong but where? My friend tells me that q involved in enetropy is...
  11. M

    At what point on the x-axis is the Electric Potential zero?

    Homework Statement A 13.0nC charge is at x = 0cm and a -1.1nC charge is at 6cm. At what point or points on the x-axis is the electric potential zero? Let X0 be a position on the x-axis Let V1 be the electrical potential at a point due to the 13nC charge Let V2 be the electrical potential...
  12. iVenky

    1/f noise at zero frequency or dc

    I read about 1/f noise. It says it is inversely proportional to frequency. What would happen at zero frequency or dc? Will it go to infinity? But when we measure some dc value we don't find any infinite voltage which clearly disproves this equation. What is the reason behind this? Thanks in...
  13. T

    Is Theta Commonly Used to Represent the Zero Vector in Linear Algebra?

    I'm looking at a Linear Algebra book that is using the greek letter θ for the zero vector. And the book has other bold letters, so it can't be that they simply could not make a bold zero. Has anyone seen such a usage before?
  14. F

    Polynomial Rings (Units and Zero divisors)

    Hi all, I would just like to get some clarity on units and zero-divisors in rings of polynomials. If I take a ring of Integers, Z4, (integers modulo 4) then I believe the units are 1 & 3. And the zero-divisor is 2. Units 1*1 = 1 3*3 = 9 = 1 Zero divisor 2*2 = 4 = 0 Now, If I...
  15. D

    /The probability density does not goto zero at the nodes if

    /// The probability density does not go to zero at the nodes if relativistic effects are taken into account. /// src=wikipedia, particle in a box. /// so does it mean energy levels/atomic orbitals are not necessarily discrete and that atom has to be remodeled. ***pardon my ignorance if I...
  16. D

    Define the potential to be zero at infinity

    Homework Statement A solid insulating sphere of radius a = 5.6 cm is fixed at the origin of a co-ordinate system as shown. The sphere is uniformly charged with a charge density ρ = -159 μC/m3. Concentric with the sphere is an uncharged spherical conducting shell of inner radius b = 10.7 cm, and...
  17. E

    This summation sums to zero. Why?

    Hi, I am reading a paper, and at some point the authors claim that: \sum_{m=1}^{L+1}\frac{\prod_{\substack{l=1\\l\neq m}}^{L+1}\frac{\lambda(m)}{\lambda(m)-\lambda(l)}}{\lambda^r(m)}=0 the question is HOW? Any tiny hint will be highly appreciated. Thanks
  18. J

    Why Is Voltage Not Zero at Infinity in This Electrostatic Scenario?

    Homework Statement A point charge q = -8 µC is surrounded by two thick, conducting spherical shells of inner and outer radii a1 = 0.2 m, a2 = 0.3 m, a3 = 0.8 m, and a4 = 0.9 m respectively. The inner shell is uncharged; the outer shell has a net charge Q = -8 µC. At this point in the...
  19. K

    Prove a set consisting of a single point is measurable and has zero area

    Homework Statement Prove that a set consisting of a single point is measurable and has zero area. Homework Equations Area Axioms: M is a class of measurable sets. (a) Every rectangle R \in M . If the edges of R have lengths h and k, then the area a(R) = hk . Additionally, a...
  20. T

    Why is the electric field inside a conductor zero?

    Homework Statement Why is the electric field, in static equilibrium, equal to zero. The Attempt at a Solution The only way I can see why is to picture that there was an electric field inside a conductor. The field would cause the electrons to move freely inside the conductor. This...
  21. C

    Exploring Natural Number-Aleph Zero Correspondence

    I was reading in George Gamow's book and he talks about drawing a one-to-one correspondence between the natural numbers and their squares and how these sets have the same size. But could I take each natural number to \aleph_{0} like 1^{\aleph_0}, 2^{\aleph_0} and draw a one-to-one...
  22. T

    Is the electric field in the human body zero?

    According to Gauss, a closed conducting body will distribute the charge to the surface. Since the human body is a conductor does that mean the electric field in our body is zero? :cool:
  23. T

    Finding charge so that the electric field is zero

    Homework Statement Two tiny objects with equal charges of 65.0 µC are placed at two corners of a square with sides of 0.335 m, as shown. How far above and to the left of the corner of the square labeled A would you place a third small object with the same charge so that the electric field is...
  24. N

    Why in general speaking the mass of gauge boson is zero?

    Please teach me this: Why in general speaking the mass of gauge boson particle is zero(except W,Z bosons)?Because if we consider the self-energy of the bosons,we might think of the mass of gauge bosons. Thank you very much for your kind helping.
  25. J

    Let f(z) be analytic with a zero of order k

    Let f(z) be analytic with a zero of order k ... Homework Statement Let f(z) be analytic with a zero of order k at z0. Show that f '(z) has a zero of order k-1 at z0. Homework Equations f(z) has a zero of order k at z0 if Ʃcn(z-z0)n (here n goes from k to ∞, and k ≠ 0) The...
  26. R

    Speed of light becomes Infinity and Zero

    Speed of light becomes Infinity and Zero! Hi Guys, I am just new to SR & GR. I learned about Lorentz contraction and time dilation, but they don't make sense when i consider the following situation... Your(Moving non inertial frame) Time runs slow relative to a stationary observer when your...
  27. D

    Physical meaning of zero eigenvalue

    Hello, Given the hamiltonian : H = -( aS_z^2 + b(S_+^2 +S_-^2) ) with S=1 and a,b>0 are constants. working with the base: { |m=1> , |m=-1> , |m=0> } The matrix form of H is: H = \left( \begin{array}{ccc} -ah^2 & -bh^2 & 0 \\ -bh^2 & -ah^2 & 0 \\ 0 & 0 & 0 \end{array}...
  28. Beer w/Straw

    Why is division by zero undefined?

    This question seems to befall everyone at one point or another. So much so I begin to get deliberately silly when it is asked http://www.wolframalpha.com/input/?i=Abs%5B1%2F0%5D Anyway, I'm wondering if there is a sticky present on these forums that addresses it specifically. Something...
  29. S

    MATLAB Matlab, logarithms and rounding small numbers to zero

    I'm a novice at MATLAB so I apologize if this is a dumb question: I need to find the sum of A, B and C given X, Y and Z, where ln(A)=X, ln(B)=Y etc. However, the values A, B and C are so small that when I try to use 'exp' the result is rounded to zero. This is a problem because later in my code...
  30. B

    Please explain - total electic field Ec + En within the coils must be zero

    Please explain -- total electic field Ec + En within the coils must be zero Hi This is from the text University Physics. In pg. 1035, chap 10, in order to justify the use of Kirchoff's rule to analyze circuits containing inductors it is written : Let's assume we are dealing with an inductor...
  31. Saitama

    Why Does the Balance Arm Rotate if the Total Torque Is Zero?

    Homework Statement When a body is weighed on an ordinary balance we demand that arm should be horizontal if the weights on two pans are equal. Suppose equal weights are put on two pans, the arm is kept at an angle with the horizontal and released. Is the torque of the two weights about the...
  32. J

    Lebesgue integral proof, prove integral is zero

    Homework Statement Suppose S is a set with finite measure, f>=0 on S and f is Lebesgue measurable. For each n in N define E_n = {x \in S | f(x) > n} Prove that \lim_{n \rightarrow \infty} \int_{E_n} f = 0 Homework Equations Definition of Lebesgue measurability for unbounded functions The...
  33. V

    Limit of an integral is from a to a does it always equal to zero?

    ∫f(x).dx from a(lower limit) to a(upper limit) =0 Is this always true
  34. S

    Is a Zero Efficiency Machine Possible and Thermodynamically Stable?

    Lets say if we have an induction motor or any motor whose rotating shaft acts as a source of alternating emf to another motor and rotating shaft of this motor again acts as a source of alternating emf to third motor and so on... We connect such a finite number of motors and we call it as a...
  35. T

    Divergence and rotational equal to zero - solutions?

    Hi, I'd like to know the solutions for these equations, and how to arrive at them. Is it possible to derive the general form of F(x,y,z) analytically? I'm still studying linear differential equations so I have no clue on what to do with partial differential equations... div F = 0 curl F = 0...
  36. K

    How to analytically prove a sum goes to zero

    How would you analytically prove that: \displaystyle{\lim_{m\rightarrow ∞}} (\frac{1}{m}\sum^{n=1}_{m}\frac{1}{n})= 0 ? The way I did it, I just proved that the greatest lower bound of \frac{1}{m} is 0, and so since the function is monotonically decreasing I proved that the limit of...
  37. F

    Why the inner product of two orthogonal vectors is zero

    Why is the inner product of two orthogonal vectors always zero? For example, in the real vector space R^n, the inner product is defined as ||a|| * ||b|| * cos(theta), and if they are orthogonal, cos(theta) is zero. I can understand that, but how does this extend to any euclidean space?
  38. 7

    Dark Energy in the Zero Energy Universe

    Hello~ I’m sorry. I can’t English well. 1. Assuming that total energy of universe is zero. It looks more natural when an initial energy value of universe is 0. Therefore, negative energy is needed to offset positive energy of matters. E_T = 0 = ( + E) + ( - E) = 0 2. Mass-energy...
  39. M

    Given two charges where to put thrid charge for zero net force

    Homework Statement Two charges, q1 and q2, are separated by a distance r. Find the position at which a third charge, q3, can be placed so that the net electrostatic force on it is zero. Homework Equations Coulomb's Law: F = (kq1q2)/r122 * (r12hat) The Attempt at a Solution I was...
  40. M

    Opposite of Absolute Zero? Absolute Hot?

    I've heard of something called Absolute Hot...the opposite of Absolute Zero (Absolute Cold). What happens at Absolute Hot?
  41. H

    Is time linear or cyclic in a flat, zero energy universe?

    I'm writing a paper for a philosophy elective on the Cosmological argument. One of my counter arguments is that a causal loop (treated as a paradox in the Cosmological argument in favor of a creator) is not a paradox if time is cyclic in nature rather than linear. I treat the fact that the...
  42. M

    Could Zero-Point Energy Be Weaponized?

    I remember reading an old article about ZPE. Physicists claim that the ZPE found within a common light bulb has the potential to boil away the Earth's oceans. This got me to thinking of Star Wars and the super laser of the Death Star. It destroyed a whole planet! I know it was only a sci-fi...
  43. C

    Does superconductivity really have zero resistance?

    Take for instance putting the large hadron collider in space at a near absolute zero where you never have to put energy into cool down the system. The LHC takes 10 GJ to run and the total energy of the two beams is 724 MJ. [1] Since the power to run the system never experiances resistence, would...
  44. P

    If there was a zero net acceleration at the equator?

    Homework Statement How long would a day have to be on Earth if there was zero net acceleration at the equator? Homework Equations Ac=v^2/r Vrotational=Ac / Radius of earth g = 9.8m/ss T = Earth's circumference / rotational velocity V= SQRT(Ac*R) Earth's Radius = 6.37x10^6 Earth's...
  45. J

    Show that the expectation value of angular momentum <Lx> is zero

    Homework Statement Show that the expectation value of angular momentum <Lx> is zero Homework Equations L±|l,m⟩ = SQRT(l(l+1)−m(m±1)h|l,m±1⟩ L± = Lx ± iLy The Attempt at a Solution I'm supposed to use ladder operators here to show <Lx> is zero. I start with...
  46. narrator

    Is Zero Division a Matter of Convention or Something Else?

    Hi, not sure if this is the right forum.. pls move if not. Almost 30 years ago, I was studying engineering and my math tutor spoke about 0 (zero) being special. We talked about how nothing can be divided by zero, and sure enough, enter 1/0 into a calculator produces an error. (I vaguely recall...
  47. R

    Zero to infinity can we assume same for universe ?

    Zero to infinity...can we assume same for universe ?? Hi, I am new to this forum, Basically I am not a scientist(not at all), like others in the forum, I belong to computer and Network field, However the science fantasies and attracts me very much just like others, ever since I was a kid , I...
  48. M

    Finding Absolute Zero Experimentally: Investigating a Capillary Tube

    We were presented with a task of calculating the temperature of absolute zero experimentally. To do this, we were given a capillary tube with one end sealed. Then we heated the tube up in a bunsen burner and quickly put the open end in some cooking oil. The oil was sucked up as the gas within...
  49. R

    Zero curl and gradient of some scalar potential

    Can someone help me intuitively understand why if a field has zero curl then it must be the gradient of a scalar potential? Thanks!
  50. E

    Rocket launches up starting from zero, conservation momentum

    Homework Statement A rocket ejects exhaust with an velocity of u. The rate at which the exhaust mass is used (mass per unit time) is b. We assume that the rocket accelerates in a straight line starting initial mass (fuel plus the body and payload) be mi, and mf be its final mass, after all...
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