Recent content by madking153

  1. M

    Some questions regarding EMC

    The main subject of it is about cable shielding in electromagnetic compatibility. I've googling myself but nothing much info about it. I got some answers from german , after translate is something like this ( dotn know correct or not ): 1. reflection produces ripples 2. to against strong...
  2. M

    Some questions regarding EMC

    thanks for the reply , I really need to know why lamda >> L .. pls help
  3. M

    Some questions regarding EMC

    HI, I got some questions regarding Electromagnetic Compatibility: 1. When we measure transfer impedance for cable shielding , why we have assume that lamda >> L ? 2. What is the difference between trasnfer impedance & admittance? My friend told me that the impedance in purely...
  4. M

    Material to dissolve enamel paint

    hi, I spray with my keyboard with Spray paint ( i think is enamel paint ) and now i am regret - so i need a solution to dissolve it but i can't remember the name , can anyone tell me ? thanks
  5. M

    Energy is conserved ?

    energy is conserved ??? hi, just read about energy conservation but i am not so clear about it .for example : a particle moves in uniform oscillation electric field - does the energy conserved ? what is the criterion for conservation energy? thanks
  6. M

    Potential conserved quantities

    So i am correct ?? angular momentum of z and energy are conserved ?
  7. M

    Potential conserved quantities

    no i am not familiar to Langrage mechanics - will learn next 2 months
  8. M

    Potential conserved quantities

    My thought : angular momentum of z component and the energy of the system is conserved ... Pls tell me if there are more quantities are conserved thanks
  9. M

    Potential conserved quantities

    hi, if i have mass possess potential U(x)=-Gm1m2/(x^2+y^2+(kz)^2 )^1/2 , i said angular momentum of z is conserved but not angular momentum of x , y .. is it correct ? what else is conserved ? energy ?
  10. M

    Projection with coriolis force

    hi, i read lots of book regarding fictitious force - coriolis and centrifugal forces, but i am not clear how to determine the direction of the force.. example. if we throw a ball vertical up , how we can know the deviation from the original position ( from book we know that if the ball...
  11. M

    Motion of spring mass with charge in magnetic field

    ya, i dont know is right or wrong - dv/dt= qBv/m -kx but the spring's motion is in x y plane ( if z is magnetic field) - how can i decribe the force cause by spring ?
  12. M

    Motion of spring mass with charge in magnetic field

    hi, got a difficult question to ask : we can easily find the motion of charge in magnetic field.But now if the charge is attached to a spring, how can we find the general motion ? is it like a gyroscope ? thanks
  13. M

    Are you in inertial frames?

    Thanks for the reply -- i am clear now thanks
  14. M

    Centripedal & Centrifugal force

    yes, centrifugal forces and coriolis forces are called Fictitious force..
  15. M

    Centripedal & Centrifugal force

    hi, what is difference between Centripedal & Centrifugal ? One is in inertial frames and the other in rotating frames? one is 'true' force and the other is fictitious force? thanks
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