Recent content by PaulDirac

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    FRM Fission Barrier Analytical Sketch

    I'm trying to work out an analytical approach to plotting fission barriers of heavy atoms as a function of angular momentum. I've visited some articles but I have found no way of calculating it. Has anyone any ideas?
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    Understanding Intrinsic 'Fraction' Function in Fortran

    I have tried to use the intrinsic' fraction' function in Fortran but have failed to understand how it works. I thought that it would return the fractional part of a real number, but when I ran a few numbers through it, I got something that was a far cry from what I expected. For example, I...
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    Vibration Massless spring static equilibrium

    I understand. I was assuming that there is still a little mass in order to involve it in the vibration. Otherwise, it is nonsense to think of vibrating a massless spring. But I don't think that is what he means, i.e. we don't have any physical spring to be totally massless. By M = 0 I think he...
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    Vibration Massless spring static equilibrium

    When you remove the force F it gets vibrating around the equilibrium point L and keeps so provided there is no dissipating forces like the air resistance to deplete the vibrational energy of the spring.
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    Why angle of incidence equal to angle of reflection

    Write Maxwell equations and apply them to the inner and outer medium. One out of three consequences you get would be the equality of incident and reflected angles. Let me know if it is not clear.
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    Is (i/x^2 d/dx) a Hermitian Operator?

    Such problem involves some integration to figure out whether it looks as a Hermitian operator or not. There's a useful thing that may help you: For a Hermitian operator we can show that < psi | H^ | phi > = <phi | H^ | psi >*, where H^ is a Hermitian operator sandwiched between the kets | psi >...
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    Is theory of relativity really relative ?

    Yeah, I believe so. I was trying to understand what he said above but I couldn't. There were just words put together in a meaningless way. @Shyan please try to write in proper English.
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    What's Coming in Physics Forums 4.0?

    The admin Greg Bernhardt should explain:)
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    What's Coming in Physics Forums 4.0?

    When somebody posts to a threat that I have already been in I tend to not take any alert of knowing it. Also when I receive a private message I don't usually get informed after having refreshed my browser. Does this upcoming version improve these weaknesses at all?
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    Relative Velocity of Stone?

    Yes, as I said above.
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    Relative Velocity of Stone?

    The question is about how to understand the initial velocity. When the balloon is moving upward (ascending) the object will have an upward initial velocity upon releasing, of course with the same magnitude as the balloon ascending. and vice versa in the case of downing.
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    What Is the Wind Velocity Affecting the Light Plane's Course?

    I just can't get the question. The plane had been moving due south with a relative speed of 185km/h. Then they decided to turn 75 degrees toward south of east, distancing 135 km in an hour. The question is to figure out what the wind velocity was. Is it the question?
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    Potential Difference in Circuits

    I just can't grasp what you are getting at. Are you saying why the pd between the negative end of E1 and the lower end of resistor R2 is claimed to be 6v?
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    Potential Difference in Circuits

    where's the picture?
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    Understanding the Ratio of Forces between Blocks in a Frictionless System

    Hint: Using the Newton's second and third laws you can write 8 separate equations. Add up all of this 8 equations to get the force F exerted to the first block.bI think it is 8ma, where a is the same acceleration for all bodies; since they are moving at the same constant rate of change of speed...
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