Recent content by xiaozegu

  1. X

    How Do You Derive the Lorentz Transformation for Frame S''?

    I cannot get it. I try to calculate γ1γ2 with V1 = V2 = 0.8c and its relativistic speed. It found that the equation could not hold.
  2. X

    How Do You Derive the Lorentz Transformation for Frame S''?

    Have you figured out the issue with gamma? I am also very confused about this question.
  3. X

    How to approach this Brownian Motion Problems

    Thanks. But I still do not know how to interpret the n and n0 in the after equation. Isn't n is 1 mol?
  4. X

    How to approach this Brownian Motion Problems

    Is Bolye's law's Ra equal to the R in the PV=NRT? Bolye's law is PV = RaT
  5. X

    How to approach this Brownian Motion Problems

    1. Problem is in the Attachment This link will help your figure these question...
  6. X

    I do not why the particle does the simple harmonic motion.

    thank you very much
  7. X

    I do not why the particle does the simple harmonic motion.

    A equals to zero. Because r cannot be negative, so A cannot <0. Plus, B>0.
  8. X

    I do not why the particle does the simple harmonic motion.

    I think it is A>0 and A>B
  9. X

    I do not why the particle does the simple harmonic motion.

    If A>0, r will decrease as time, If A<0, r will increase as time.
  10. X

    I do not why the particle does the simple harmonic motion.

    So it needs A>0,B<0?
  11. X

    I do not why the particle does the simple harmonic motion.

    If B is negative, is it OK?
  12. X

    I do not why the particle does the simple harmonic motion.

    If γ >0, e-γt decreases as time goes up, e+γt increase. So I need find the derivative of these two items make de+γt/dt>de-γt/dt?
  13. X

    I do not why the particle does the simple harmonic motion.

    I can get Be2γt>A
  14. X

    I do not why the particle does the simple harmonic motion.

    So it needs A+B<0?
  15. X

    I do not why the particle does the simple harmonic motion.

    Is it a resistance force? If not, how can r decrease?