Conservation laws Definition and 110 Threads

  1. B

    Violation of Conservation Laws: Can an Electron Decay into Two Neutrinos?

    Homework Statement A claim has been made that an electron decays into 2 neutrinos traveling in different directions. Which conservation laws would be violated by this decay and which would be obeyed? Homework Equations Momentum: p = mv Mass-energy: E = mc² Electron Baryon number: 0...
  2. M

    How Do Conservation Laws Apply to a Collision and Subsequent Motion?

    Having a difficult time determining which laws and equations to use? A 15.0 kg block is attached to a very light horizontal spring of force constant 350 N/m and is resting on a smooth horizontal table. Suddenly it is struck by a 3.00 kg stone traveling horizontally at 8.00m/s to the right...
  3. S

    Conservation Laws - conceptual help

    Here's the question: "An astronnaut working with many tools some distance away from a spacecraft is stranded when the "manueving unit" malfunctions. How can the astronaut return to the spacecraft by sacrificing some of the tools?" I don't quite understand what they're getting at here...
  4. B

    Conservation laws and relativistic dynamics

    do you consider that conservation laws of momentum and energy are compulsory in the derivation of the fundamental equations of relativistic dynamics
  5. S

    Conservation Laws - Linear & Angular Momentum Explained

    I have read that in classical physics, symmetry under tranlsation implies conservation of linear momentum, and that symmetry under rotation implies conservation of angular momentum. Could you guys give me a brief explanation, or if the explanation is not brief Point me towards a good website...
  6. C

    Simulating Coliding Springs - Is it possible without invoking conservation laws?

    Hi, I am working on a simulation and I have a problem of similar nature to the following: Consider a horizontal frictionless pipe containing two damped springs with the same diameter as the pipe. Suppose both of the springs are moving horizontally through the pipe, one faster than the...
  7. T

    How High Will a Pebble Go When Shot from a Compressed Spring?

    The question I'm doing for homework that I can't get is... A spring is compressed 10.0 cm by an average force of 50.0 N. If the spring shoots a 20.0 g pebble straight up into the air, how high will it rise? It would be sooper awesome if you could help with this!
  8. L

    Conservation Laws Homework help

    Hi, I'm having a few problems with my Homework I'll post one question for now then if I find out where I got stuck I'll go on to my next question. Alright... "A 1500kg car accelerates up a hill in an attempt to pass a semi truck, it had an initial velocity of 12m/s if accelerated at a rate...
  9. M

    How Are Conservation Laws Respected in the Dirac Field?

    I have a question about the Dirac field. If as quantum field theory states , every point in the Universe is filled with "virtual" photons , and if these "virtual" photons in turn give rise to electron-positron pairs , which being components of matter and anti-matter collide and annihilate each...
  10. Norman

    Proving Conservation Laws for Galilean Boosts - Norm

    Anyone know what quantity is conserved if the Hamiltonian (classical) is invariant under a Galilean boost? Also how would I prove that it is this quantity that is conserved? Cheers, Norm
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