Recent content by astrozilla

  1. A

    Subsets and sets symbol explenation (Very simple question please have a look)

    Homework Statement Hi I would like you please to look my attachement ,and explain to me the meaning of the line above M and N what's the meaning of this line?It seems to me that it acts as we should take the complementary collection of numbers . Homework Equations The Attempt at a...
  2. A

    How do I prove that A^B is orthogonal to A?

    If you know how to calculate cross product ^ , you will do A^B and if you find correctrly the value ~(itwill be a vector the result ,lets call it C) then you take the dot product of C with A and if it is zero they are orthogonal. since cos90 =0 and (A) dot (B)= A B cosθ ii)i think you...
  3. A

    What Equation Should Be Used for Accelerating Frames in Relativity?

    Homework Statement A frame is accelerating uniformly along the x-axis relative to an inertial frame (x,y,z) with acceleration a.Find the transformation between the frames given that the origins concide at t=0. Homework Equations The lorentz transformations cannot apply here ,but what...
  4. A

    How Do We Calculate Uncertainty in Quantum Operators?

    o:) ...
  5. A

    How Do We Calculate Uncertainty in Quantum Operators?

    This is definitely a very stupid exam question. I just thought that there is some mathematical formula or that ΔO (uncertainty) is related somehow to Werner Heisenberg's uncertainty principle.
  6. A

    How Do We Calculate Uncertainty in Quantum Operators?

    Homework Statement How can we compute the error or uncertainty in measuring an operator O ? Homework Equations The Attempt at a Solution
  7. A

    Definitions of eigenstate, eigenvalue and eigenfunction?

    The Schrödinger's time independent equation can be written as Af =λf. This means that rhe Hamiltonian(or total energy operator) operating on f gives a contant times f.This is an example of an eigenvalue equation.Solutions are an infinite set of eigenfunctions fn and associated energy...
  8. A

    Show how the Boltzmann entropy is derived from the Gibbs entropy for equilibrium

    ln(1/Ω)= ln1-lnΩ lol
  9. A

    What Does a Constant Number of Particles Mean for the Chemical Potential?

    change in Helmholtz free energy is given by : dF = -SdT-PdV +μdN μ is equal to zero thanks
  10. A

    What Does a Constant Number of Particles Mean for the Chemical Potential?

    Homework Statement What happens when the hemholtz free energy F of a system does not depend on the number of particles of the system?What does this mean for the chemical potential μ? μ= U+PV -TS ,μ= F+PV Homework Equations F (OR A) F=U-TS The Attempt at a Solution I think the...
  11. A

    Satellite pedigree/apogee ratio. 2 values given both __Earth radii

    The other way round but this is not even a level question
  12. A

    What Is the Absolute Magnitude of a 60W Lightbulb?

    First, The Greek Astronomer Hiparchos divided the stars we see on the sky in 6 magnitudes.The brightest were of first magnitude ,the next fainter stars were second and the stars just visible with naked eye were 6th magnitude. British astronomer Pogson(1854) ,taking into account the law of Weber...
  13. A

    Deriving Newton's 2nd Law for Single Body in 1D Case

    Homework Statement How can Newton's 2nd law be derived for a single body in an 1Dimesional case ? Homework Equations F=m(du/dt) The Attempt at a Solution It is given that the principle of conservation of energy must be used,for the derivation. Are there any more hints?
  14. A

    Which is the equation? (Langrangian POINT)

    Homework Statement Calculate the distance from Earth to L2. Homework Equations The mass of Earth is Given to be 6x10^24 kg The Attempt at a Solution L2 is the second langragian point,where the gravitational forces of the sun and the Earth balance. The question is which equation...
  15. A

    Understanding Forced Damped Oscillations at Resonance and Low Frequencies

    Thanks for the advise, as i become more educated i will use more latex !