# Search results

1. ### 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...
2. ### 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
3. ### 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
4. ### 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 ?
5. ### 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...
6. ### 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
7. ### 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
8. ### 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...
9. ### 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 ?
10. ### 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
11. ### 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 !
12. ### 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 ??
13. ### Linear (in)dependent vector sets

are 6, 3*(sinx)^2 and 2*(cosx)^2 - linearly independent ? Can someone explain how to determine it ?
14. ### 2 simple vector spaces question

hi,i got 2 question about vector spaces : 1. Do the set of all n-tuples of real numbers of the form (x, x1 ,x2.....xn) with the standard operation on R^2 are vector spaces? 2.Do the set of all positive real numbers with operations x+y =x*y and kx=x^2 are vector space?