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. M

    Divergence of a Magnetic Field not equaling zero

    I have a larger problem involving divergences and curls, but the correct answer requires ∇°B (divergence of B) = 0. I understand the proof of this in Griffiths, but the definition of divergence in cylindrical coordinates is: After using the product rule to split the first term, we get the...
  2. Z

    Zero Group Velocity: What Does it Mean?

    An infinitely long "mass-spring transmission line", consisting of masses (m) connected by springs (spring constant s) obeys the following dispersion relation: ω = \sqrt{4s/m} sin(kd/2). The group velocity is dω/dk = d/2 \sqrt{4s/m} cos(kd/2). What does zero group velocity "mean" for...
  3. N

    How do inflation, and the zero energy flat universe tie into one another?

    New to cosmology and somewhat confused. I get all the ideas indvidually, that inflation is the exponential growth in the beginning of the universe, than that gravity and matter cancel each other out to make the zero energy universe, and that a flat universe is the only one that is zero energy...
  4. W

    Can an Electron Have Zero Kinetic Energy in a Confined Space?

    hi guys, is it possible for electron to have zero K.E in a confined region in space? My guessed is, due to the wave nature of electron, if electron were to possesses zero KE, its wavelength will have to approach infinity since p = h / wavelength. therefore its not possible for electron to have...
  5. L

    Need solution to view through glass at near zero angle

    Hi, I am designing a device which has cameras need to see through a sheet of glass at angle very low, near zero. And at that angle most of light is reflected so it is very hard to see. - The surface of the transparent material must be flat and smooth - The camera must see outside object...
  6. stripes

    Proving Riemann Integrability: How to Show a Set is of Measure Zero?

    I am trying to prove if f and g are Riemann integrable, then fg is also Riemann integrable using Lebesgue's integrability criterion. I already proved that a Riemann integrable function is bounded. Not much harder to show fg is too bounded. How do I show that [a,b] is of measure zero? I can't...
  7. Q

    Unlock the Mystery of Work & Energy: Zero Acceleration, Constant Velocity

    https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/v/work-and-energy--part-2 I was watching a video at Khan Academy on Work & Energy (link above). At 2:50, he describes a situation with an elevator doing work against gravity. My question is pretty simple: If...
  8. H

    Understanding the Concept of Gradient for a Zero Function

    Suppose F(x,y,z) = 0 grad (F) = 0 ? e.g. F = x + y + z grad (F) = <1,1,1> =/= <0,0,0> ?? I don't know why I get an opposite result
  9. M

    Can you reach absolute zero in complete empty space

    Ok, so I know that the laws of physics say reaching absolute zero temperature is impossible, but suppose we took a box that was perfectly insulated in completely empy space, and I took all the particles out of it to create a vacuum. Now, since there are no particles in the box, then wouldn't...
  10. M

    Distance from +4μC to Zero Potential: 24mm

    Homework Statement The diagram shows two charges, +4 μC and –16 μC, 120 mm apart. What is the distance from the +4 μC charge to the point between the two charges where the resultant electric potential is zero? A 24mm B 40mm C 80mm D 96mm Homework Equations potential equation...
  11. M

    When is electric field zero and electric potential non zero

    Homework Statement Which one of the following statements about electric field strength and electric potential is incorrect? A Electric potential is a scalar quantity. B Electric field strength is a vector quantity. C Electric potential is zero whenever the electric field strength is zero. D...
  12. P

    Zero impact vehicle that needs to travel 9 through 12 m

    Homework Statement the vehicle needs to stop as close to a wall that is located anywhere from 9 to 12 m away. (The distance is not given exactly) The vehicle must be self propelled and has other specifications located here...
  13. B

    Can Understanding Gravity Help Us Grasp Absolute Zero?

    Absolute zero is the theoretical state in which a system reaches 0K, or NO energy present right? And if gravity affects everything with momentum and energy, would it cease to affect absolute zero systems because it includes no energy and thus no momentum? I posted a blog post on it here...
  14. N

    Ampere Law in a hole Should give zero?

    Hi all, I just did an exercice and there is one point that I don't understand (about Ampere's law). Homework Statement The exercice was about a cable with given diameter a, in which a small hole with diameter b is drilled in. The axis of the cable and the hole are parallel and the...
  15. Q

    Why does it matter whether or not an ammeter has zero resistance?

    Apparently an ideal ammeter has zero resistance. But for a series circuit, why does it matter? The purpose of an ammeter is to give the reading for the amount of current going round a 'loop' of circuit. Having some resistance does not prevent the ammeter from giving a true reading, right? So...
  16. F

    Why is the value zero not possible with computers?

    Hello Forum, any number that a computer deals with is just an approximation...in what sense? Why is the number zero not possible? The number zero is often a very very very small number (10^-19) but never exactly zero. Why? thanks, fisico30
  17. A

    Why the total tension is not zero?

    If two ends of a rope in equilibrium are pulled with forces equal in magnitude and opposite direction,why the total tension in the rod is not zero? Homework Equations The Attempt at a Solution
  18. A

    Questions about Proving R/I is not the Zero Ring

    I have a question about the proof that I attached... 1) Since R/I is not the zero ring, we know that 1 \not= 0. What is the reason to say 1 + I \not= 0 + I instead of 1 \not= 0?2) Also, how do we compute something like (a+I)(b+I)? Isn't this correct (a+I)(b+I) = ab+aI+bI+I^2? 3) Finally, if we...
  19. S

    How to Determine Damping Ratio and Pole Zeros from a Differential Equation?

    The following diff. equation describes the functionality of a system with respect to time. However, it is not known how the system will behave when stimulated. Apply a forward Laplace transform to determine damping ratio and pole zeros. Plot a pole zero diagram and comment on stability. d2y/dt2...
  20. penomade

    Can Two Different Coordinate Systems Explain the Zero Relative Speed of Light?

    Suppose a beam of light is approaching you from a distant source. As it comes closer to you, it doesn’t hit you; instead it misses you by a 10 meter distance. How can the rate of acceleration of that beam relative to you, be explained(in non-jargon language)? What would the speed of that be...
  21. S

    Exploring Beyond Absolute Zero: Thermodynamics Re-examined

    http://www.tgdaily.com/general-sciences-features/68525-beyond-absolute-zero-temperatures-get-hotter#cRgTRdxE2qwYX5DR.16 It's been done in the lab, could this be seen in the cosmos? Could this affect entropies end game? What does this mean for the second law of thermodynamics?
  22. F

    Quantum Gas Below Absolute Zero

    Quantum Gas Below Absolute Zero! http://www.nature.com/news/quantum-gas-goes-below-absolute-zero-1.12146 I am a fresh undergraduate student and not expertise in fields. The link above shows an interesting research on negative temperature. I've visited wikipedia and found out that negative...
  23. B

    Exploring Negative Temperatures: What Lies Beyond Absolute Zero?

    Absolute zero is often thought to be the coldest temperature possible. But now researchers show they can achieve even lower temperatures for a strange realm of "negative temperatures." http://www.livescience.com/25959-atoms-colder-than-absolute-zero.html
  24. O

    Evaluate lim e^x when x approaches zero from negative

    Homework Statement What is the limit of e^x when x approaches zero from negative side Homework Equations The Attempt at a Solution Taylor series? Then the answer is put all x= 0 , and the answer is 1, but why the question ask from negative side?? Thank you very much
  25. M

    Zero curl but nonzero circulation

    The vector field \vec{F} = <\frac{-y}{x^2 + y^2},\frac{x}{x^2 + y^2},0> has a zero curl, which means its circulation is zero. However \int \vec{F}.d\vec{s} around a unit circle on the xy plane is equal to (+/-)2\pi and not zero Is it because F is undefined at (0,0)? No, because Stoke's...
  26. A

    Rolling without slipping: Why point of contact has zero velocity

    In rolling without slipping, why does the point of contact have zero velocity relative to the ground? If so, how can the point of contact move relatively to the ground? (It has to move relative to the ground, otherwise it cannot roll and must stay in its original position)
  27. J

    Is a black hole's mass zero according to a distant observer?

    According to the Schwarzschild metric an interval of proper time d\tau at a fixed distance r from an object of mass M is related to an interval of co-ordinate time dt measured by a distant observer: d\tau = dt \sqrt{1 - \frac{2GM}{rc^2}} This is just the gravitational time dilation formula...
  28. N

    Is There Any Motion at Absolute Zero?

    Is it possible for motion to exist at 0 Kelvin?
  29. askhetan

    Zero Point Energy and Bose Einstein Condensates

    They say ZPE is the energy of the system at 0 K due to vibrations and even though the Schroedinger equation gives us the ground state minimum energy of the system (lets say by DFT/HF/QMC whatever), this energy is a little higher than that. My first question is, because I have learned that...
  30. C

    What does zero partition function physically mean?

    Is there a physical process in thermodynamics that results the value of the partition function as zero? When partition function is zero, then free energy becomes infinity, and it also yields negative entropy (at least within the system). Are there physical meanings of these?
  31. B

    Understanding Zero Angular Momentum

    Hello, I am currently reading about angular momentum. A sentence in my textbook sort of confused me: "when the translational velocity of the particle is along a line that passes through the axis, the particle has zero angular momentum with respect to the axis." I was wondering if someone...
  32. M

    Can overdrive voltage never be less than zero?

    I had a test recently and one of the problems was pretty basic. It gave you a table with the voltages at the gate, source, and drain of the device. Vt (Threshold voltage) was also provided, which was +1V. From there we were supposed to find Vgs, Vov(Overdrive voltage), Vds and the region of...
  33. T

    Instantaneous Center of Zero Velocity for a Yo-Yo Unravelling

    Homework Statement Here is the question along with the solution: I was wondering why the ICZV is at point A. Is it because the string is not slipping and thus the yo-yo is essentially "rolling" on the surface of the rope? Kind of like a bike wheel rolling on the ground?
  34. J

    Line of action from pivot to force should be zero?

    Homework Statement I am seeing the steps on others who have worked this out and they are taking the pin as the pivot position. I thought a force's line of action that passes the pivot position produces zero torque? So i tried to make the center of mass the pivot position and each...
  35. H

    Simple Zero State Response Signals Question

    Homework Statement Let's say I've got simple y''(t) + 2y' + 1 = x(t), with maybe y(0) = 3 and y'(0)=1. the input x(t) is 12cos(20t). Using a laplace transform, determine zero state response of the output y(t). I know eventually I end up with the Y(s) and X(s) form, and then I have to...
  36. D

    Someone explain hybrid zero dynamics in simple english?

    Homework Statement I'm working on a bipedal walker and as part of initial research I found hybrid zero dynamics as a solution to help detect terrain. The current method used is combining data from accelerometer and gyroscope and using Kalman Filter to find angle in x,y,z planes...
  37. D

    How to explain that ∇ ⋅ B = 0 but ∂Bz/∂z can be non zero?

    It is known that Gauss's law for magnetism is ∇ ⋅ B = 0. If we write this in component form it becomes (∂Bx/∂x)i + (∂By/∂y)j + (∂Bz/∂z)k = 0, where i, j, k are unit vectors in a cartesian coordinate system and Bx, By, Bz are the components of the magnetic field on these axes. It would follow...
  38. STEMucator

    Prove if S and T are sets with outer content zero, SUT has outer content zero.

    Homework Statement Suppose that S and T are sets with outer content 0, prove that SUT also has outer content zero. Homework Equations C(S) denotes the outer content. C(S) = C(T) = 0 Also : C(S) = inf \left\{{ \sum_{k=0}^{n} A_k}\right\} where Ak is the area of one of the...
  39. FOIWATER

    Why does this integral lead to zero, while the other does not.

    why does this integral: double integral (x+y) dA , A is the area bounded by the triangle with vertices (0,0) (0,1) (1,0) equal 1/3 While this one, (x-y) dA , A is the area bounded by the same vertices equal 0? (not looking for the math, already worked them out, just looking for some...
  40. S

    Why is the net torque not exactly zero.

    Homework Statement The sum of the net torques is zero even f the numerical result is not. Rather than simply explaining that the net torque is close to zero, justify that your net torque is small, within the context of this experiment. 2. Attached is a pdf of the lab that we had this...
  41. J

    MATLAB Functions close to zero in MATLAB

    Hi all, I need to find where a collection of curves are all approximately equal to zero (given some tolerance level) and was wondering if anyone could help me? I'm running the following script in MATLAB: dF2=0.001; dG2=0.001; initF2=0.522; initG2=-0.603; K=zeros(2); etaspan=[0...
  42. I

    Can We Measure Velocity with Zero Uncertainty?

    could we able to measure the velocity for a free particle with uncertainty equal to zero, could we able to have a certain values for its velocity, and let the uncertainty of the position to be infinity is there any theoretical restrictions on having a certain value for the velocity? is there...
  43. P

    Zero gravitation is it possible

    zero gravitation! is it possible 1. Can you tell me the name of two particles having zero force of gravitation between them ?
  44. Z

    Fortran [FORTRAN] Division by zero allowed?

    Hi, I have an issue where I am squaring a very small complex number 1e-20 (FALFA2) which seems to make the value zero (both the real and imag part) and then dividing by it, the problem line is (all the numbers are complex): GALFA = ( FBETA * FAA / FALFA2 ) - ( FAB / FALFA )...
  45. C

    Is ∫1/x^2 - ∫1/x^2 from 0 to 2 Zero or Undefined?

    Hi I would like to know what is ∫1/x^2-∫1/x^2 from 0 to 2.is it zero or undefined meaning that it is infinity ? (because each integral is undefined at zero).
  46. H

    Finding the Electric Field Zero Point: A Point Charge Problem

    Homework Statement A point charge of -2 micro coulomb is located at the origin ,a second charge point of 6 micro coulomb is at x= 1m and y= 0.5 m Find the x and y coordinates of the position where the electric field is zero Homework Equations E=κq/ r^2 multiplied by unit vector...
  47. O

    Equivalence of the nullspace and eigenvectors corresponding to zero eigenvalue

    Suppose a square matrix A is given. Is it true that the null space of A corresponds to eigenvectors of A being associated with its zero eigenvalue? I'm a bit confused with the terms 'algebraic and geometric multiplicity' of eigenvalues related to the previous statement? How does this affect the...
  48. umair20

    Why Photon Mass is Zero: Proving it with Relativity Theory

    why rest mass of photon is zero? how to prove it by m=m'/√(1-v^2/c^2)?
  49. J

    Set of functions that are eventually zero

    The problem asks whether the set F of all functions from Z+ into {0,1} that are "eventually zero" is countable or uncountable. In my proof, I claimed countable. By definition, associated with each function f in F, there is a positive integer N such that f(n)=0 for n≥N. I took N' to be the...
  50. S

    Square wave symmetric around zero volts

    Hi everyone For a pre-lab, I am asked to draw a square wave symmetric around zero volts. I am not sure what this graph looks like, can someone give me an example? Thank You
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