# Recent content by madking153

1. ### 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. ### Some questions regarding EMC

thanks for the reply , I really need to know why lamda >> L .. pls help
3. ### 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. ### 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. ### 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. ### Potential conserved quantities

So i am correct ?? angular momentum of z and energy are conserved ?
7. ### Potential conserved quantities

no i am not familiar to Langrage mechanics - will learn next 2 months
8. ### 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. ### 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. ### 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. ### 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. ### 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. ### Are you in inertial frames?

Thanks for the reply -- i am clear now thanks
14. ### Centripedal & Centrifugal force

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