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  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
  16. M

    Are you in inertial frames?

    but his question is : How to determine that your lab is in inertial frame or not ?
  17. M

    Are you in inertial frames?

    Are you in inertial frames??? hi, today my friend ask me 2 simple questions, too shame i cannot answer him...so i post it here: is the classroom an inertial system ?? earth is rotating around the sun - so ...can still consider as inertial ? 2. If u working in laboratory to find so...
  18. M

    Vertical Projectile with air friction

    i will consider both conditions .. if the initial velocity is not too high - then is propotional to v , if not ( high velocity ) then is proportional to v^2... i got a long a strange solution for max height...
  19. M

    Vertical Projectile with air friction

    i had the same equation motion, but how we can find the max height ?
  20. M

    Vertical Projectile with air friction

    hi, If we throw a ball vertical upward, we can easily find the maximum height if ignore the friction.. So if we switch on the friction, how can we find the max height ?
  21. M

    Kernel of differentiation and integration

    i asking a question but u ask me back ???!!!
  22. M

    Kernel of differentiation and integration

    nevermind - i think i konw the answer
  23. M

    Kernel of differentiation and integration

    hi, i got a algebra question regarding kernel 1.what is the kernel of intergration operator: T(p)= p'(x)? 2. what is the kernel of differentiation operator : T(p) = integration of p(x) from -1 to 1 thanks
  24. M

    Use identities to Prove linearly idenpendent

    that mean any set of vectors contain a 0 cannot be linearly independent ? not independent but linealy independent
  25. M

    Use identities to Prove linearly idenpendent

    determine following setd of vectors in F(-infinitity, infinitiy) are linearly independent (using appropriate identities) 0, [cos (pi*x)]^3 , [sin 3*pi*x]^5 pls help !
  26. M

    MATLAB Determine the machine precision in Matlab

    hi, how to determine the machine precision in matlab and estimate from this how many bits are used in the mantissa ??
  27. M

    2 simple vector spaces question

    ( a 1 ) --- is this 2x2 matrix a vector space ? sorry for asking this coz this is abstract 1 b me
  28. M

    Linear (in)dependent vector sets

    how i use the identity to solve that problem
  29. M

    Linear (in)dependent vector sets

    are 6, 3*(sinx)^2 and 2*(cosx)^2 - linearly independent ? Can someone explain how to determine it ?
  30. M

    2 simple vector spaces question

    so you are saying that : the set of all positive real numbers with operations x+y =x*y and kx=x^2 are vector space?
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