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  • Phase and group velocity for the wave function - Physics Forums
    While formally this can be called the phase velocity of the envelope, it is a convention to call it a group velocity (because the envelope groups together various waves, which then propagate "as a whole" inside the carrier envelope) Thus ##v_g = \Delta\omega \Delta k##, and you can imagine that in the limit this becomes a derivative ##v_g
  • Derivation of velocity in nth Bohr orbit • Physics Forums
    Homework Statement (a) Derive an expression for the electron's speed in the nth Bohr model (b) Prove that the orbit with highest speed is the n = 1 orbit,with v(1) = ke^2 h compare this with the speed of light , and comment on the validity of ignoring relativity (as we did) in
  • Problem in understanding instantaneous velocity - Physics Forums
    The point where the tangent is drawn is the instantaneous velocity, and the slope of the secant is the average velocity If you let ##x_1## approach ##x_0,## which are moments in time, you finally receive the (yellow) tangent at ##x_0 ##
  • Invariance of 4-velocity - Physics Forums
    4-velocity vector dot itself will not be equal to C^2, if we don't multiply time by coefficient C (speed of light) If we don't multiply time by the speed of light C, in Lorentz transformation equatins, the invariant tensor of U U will not be equal to c^2
  • Is velocity ever a scalar quantity? - Physics Forums
    I thought velocity was always a vector quantity, one with both magnitude and direction When it came to the suvat equations, where v = final velocity, and u = initial velocity, I thought both of those were vector quantities, e g; v (final velocity) 112km hr North u (initial velocity) 0km hr
  • Solving for distance using only initial velocity and coefficient of . . .
    At the early point (probably around chapter 4) of an "elementary physics" textbook, a student encounters problems where, given an initial velocity and coefficient of friction, the student is expected to provide the resulting final displacement This is a stage of the textbook where kinetic energy equations and "work" equations have not yet been
  • Vertical circular motion minimum speed proof - Physics Forums
    so the body reached the top let's take what happened so far, in reverse now the body has velocity of (rg)^0 5 to the other side, mg is still downward we KNOW the body will complete the half circle reversed motion, because we've just seen it complete it
  • Calculating Nozzle Flow Rate - Physics Forums
    for measuring velocity of water so we have to calculate velocity using head calculation or from stagnation pressure which we measure using a pitot tube Calculate Velocity from Head We can use Bernoulli's Equation to calculate velocity of a fluid from head Head is the distance from outlet to top of water V= 2gh V = Velocity m sec or feet per sec




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