Weak Definition and 473 Threads

  1. X

    Is Luzin Hypothesis Consistent with Set Theory?

    Regarding the weak continuum hypothesis (B.F. Jones): {\displaystyle 2^ {\aleph_{0}} < 2^ {\aleph_{1}}} and the Luzin Hypothesis: {\displaystyle 2^ {\aleph_{0}} = 2^ {\aleph_{1}}} Where can I find Bukovsky's paper that shows the Luzin Hypothesis is consistent with set theory? Or perhaps...
  2. T

    If you have a weak stomach don't click here

    I had dinner at the Mexican restaurant again. Got it to go. I got a burrito and a pop. After I had eaten and drank my pop I took the lid off the pop and was chewing on some ice. that's when I noticed something at the bottom of the cup. I reached in and pulled it out. I placed the object on my...
  3. homology

    Understanding Weak Convergence in Little l1 and Little l∞ Spaces

    hello folks, I've got a question about weak convergence. I'm sure I'm missing something but can't see what it is (<--standard "I'm dumb apology") The problem concerns little l 1 and little l infinity (which is dual to little l 1) To make notation easier I'm going to denote these...
  4. R

    Question on Weak Energy Condition

    Hi, I have just read that one of the restrictions on T^{\mu\nu} is that: T^{\mu\nu}u^au^b > 0 where u is a timelike vector. Can someone please tell me WHAT u actually is (other than saying it is a timelike vector). What sort of vector is it, what is the context? i.e Once...
  5. W

    Weak and strong anthropic principle

    Can somebody post the diferences. To me they seem to be the same
  6. P

    Identifying Weak Acids: HCNO, HBr, HF, HNO2, and HCN

    i had this question on atest recently, it said to identify whish of these is not a weak acid: HCNO : HBr : HF : HNO2 : HCN. Now the problem i am having with his, is in my book it gives that theyre common acids...ig deal, not if theyre strong or weak, and on the internet as far as i have found...
  7. H

    Understanding the Weak Nuclear Force: Effects on Quarks & Leptons

    Whenever i research the weak nuclear force i always get how it is the cause of beta decay and other ways it effects an atom, but i can never get a clear answer to what the force actually is, what does it do? i know that it effects quarks and leptons but i have no idea how it effects them, can...
  8. D

    PH of weak acid/weak base salts

    I'm trying to show my students that CaCO_3 is basic. Ca^2^+ comes from Ca(OH)_2, which is a weak base due to it's low solubility. CO_3^2^- comes from the weak acid HCO_3^-. To compare the two we compare: 1) Ca^2^+ + H_2O --> Ca(OH)_2 + H_3O^+ and 2) CO_3^2^- + H_2O --> HCO_3^- +...
  9. A

    Solve Ka for Weak Acid HCN - 0.18mol KCN in 1.00L, pH 9.70, 298K

    hi forum, would nebody be able to help me solve this problem? 0.18mol of potassium cyanide (KCN) was dissolved in 1.00L of a solution in which the pH was held constant at 9.70 at a temperature of 298K. the equilibrium concentration of CN- was 0.13M. Calculate Ka for the weak acid HCN...
  10. Clausius2

    What causes the condensation trails behind airplanes?

    Everybody has seen the weak of condensed water which is left behind an aircraft when it flies in air. To say the truth I am not an specialist in Aeronautical stuff, so I am searching a brave who tells me from where this weak comes from: -does it come from the products of combustion (H2O...
  11. JamesU

    What are the strongest and weakest substances in my house?

    Strongest substances in my house 1) Xacto knife-I fell back in my chair. before I fell all the way, I wedged the Xacto knife in my hand under the desk. It bent, but pulled me back up. :biggrin: 2) The Jelly jar lid- Can't Get It open! :mad: 3)My cat- after multiple times of throwing...
  12. S

    Weak Nuclear Force: Get Basic Explanation & Characteristics

    I'm looking for some sort of basic explanation on the characteristics of the weak nuclear force. All of the physics books I've checked up in have only minimal references to the weak force, and the only information I've been able to get on it is a) that it plays some role in radioactivity, and b)...
  13. S

    Question about weak convergence in Hilbert space

    The Question is as follows: let A be a bounded domain in R^n and Xm a series of real functions in L^2 (A). if Xm converge weakly to X in L^2(A) and (Xm)^2 converge weakly to Y in L^2(A) then Y=X^2. i don't know if the above theorem is true and could sure use any help i can get. if...
  14. tandoorichicken

    Is the Ratio of [A^-] to [HA] Always 1 for Weak Monoprotic Acids?

    for a weak monoprotic acid is the ratio \frac{[A^-]}{[HA]} always equal to 1? edit: never mind. answered my own dumb question. :bugeye:
  15. A

    What is the Best Method for Titration of a Weak Acid with a Strong Base?

    Hiya, Im trying to determine the initial molarity of an unknown acid, sooo I am trying to titrate it with standardized sodium hydroxide solution (0.1M). But I am having a load of problems figuring out what the heck I am supposed to do since i am told the acid is a weak acid. If I am...
  16. J

    Nuetralization Reaction involving a weak acid and weak base

    CH3OOH (aq) + NH3 (aq) ‹———› NH4+ (aq) + CH3COO- (aq) Would the above reaction, involving acetic acid and ammonia qualify as a proper neurtalization reaction involving a weak acid and weak base? Or, would a reaction involving acetic acid and sodium bicarbonate be better? Regards
  17. R

    Pion decay via the weak interaction

    Hi, i have a particle physics exam in 2 days and am confused on pion decay via the weak interaction, namely: pi[-] ->muon + anti-muno neutrino Thankyou Ray Veldkamp
  18. M

    The weak interaction and fusion?

    I've heard that the weak interaction actually governs fusion between hydrogen especially in the sun, how does this actually works?
  19. turin

    What determines the behavior of weak interactions in fundamental particles?

    Can the cross-section of the weak interaction be extended? Are there things that can be done to fundamental particles in order to either increase their likely-hood or range of interacting weakly with a neutrino? What causes a fundamental particle to emit a weak boson anyway?
  20. N

    Isn't this a weak basis for time paradoxes ?

    Your wide spaceship has inside a light and a receiver, widely separated, sideways to direction of travel. As pilot, you notice the blinking light always takes the same time to hit the receiver, whether you are approaching speed of light or not. But an outside observer notices that the path the...
  21. ShawnD

    Adding a weak acid to a strong acid

    If a weak acid is added to a strong acid, does it make the solution more acidic or less acidic? Assuming that the weak acid is not one of those ions that can turn into a stronger acid or a stronger base (like H2CO3 <--> HCO3 <--> CO3). I was thinking something like adding ethanoic acid to...
  22. Simfish

    Archived Question about Weak Nuclear Force

    Hi; I have a question: Does the weak nuclear force convey the decay undergone by radioisotopes or not? Is the decay of radioisotopes caused instead by the electromagnetic repulsion that overcomes the strong nuclear force? Also, what type of radioactivity is conveyed by the weak nuclear force? I...
  23. T

    The Weak vs Strong Anthropic Principle

    Which one do you believe is right the weak anthropic principle or the strong anthropic pricple. weak-one universe Strong-millions of universes, each with a differnt value for the constants.
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