Recent content by SpeedBird

Hello, You could do this with a very cheap microcontroller and a digital potentiometer. A simple circuit could measure the output of the potential divider made with the Jeep fuel tank sensor and R1 (in the diagram). The microcontroller could then calculate the resistance and output the...

maybe try finding voltages due to the individual batteries at first. i.e. short circuit the other two. im not sure if this is the way to go about it. i may be completely wrong! it's a suggestion anyway :-)

i havnt computed the FT. the integration is huge and i get stuck pretty quickly. do you think getting the Freq spectrum could mean getting a_k and b_k coefficients for the Fourier series and plotting their magnitudes against k?

microcap is also pretty good

does anyone have any ideas?

maybe if i was in the exam at the time. :smile: it's a question from last years signal analysis exam. thanks anyway!

Hello there, Im sure someone on this forum must know how to go about this. It is part of an exam question. Firstly I must draw a sketch of this pulse: v=0 when |t| > a v=V0( 1 + t/a ) when -a < t <= 0 v=V0( 1 - t/a ) when 0 < t < a v represents amplitude, V0 represents peak...

well the talk went excellently :-D Nik

Hello there, i am a third year undergrad physics student in ireland i have to give a talk on careers with a basic physics degree. id like to hear from people that have gone straight into work after getting their degree in physics. does anyone know what areas people go into? is it mostly...

Thank you very much :-) Nik

so, to get the phase differece in radians - would i multiply the time difference by 2*Pi/T? (T is the period). Thanks, Nik

i think the wave should be propagating in the z direction if it's propagating at 45 degrees to the x-axis, it's also at 45 degrees to the y-axis. So, i think you're looking for something more like E(z,t)=Eo Cos(kz-wt) or something.. i've got an exam in the subject in a weeks time and...

if i have two sinusoidal waveform that are out of phase.. is it possible to calculate the phase difference knowing the frequency and time interval between the peaks of the waves? im sure it is but I am stumped on how to go about it. I am sure its quite easty.. any ideas? thanks very much...

No worries :biggrin:

i made an error there sorry 1.0006 is the relative permittivity of air you multiply this by the permittivity of free space. permittivity of free space is 8.85*10^-12 permittivity of air is (8.85*10^-12)*1.0006 = 8.85531*10^-12 d = dist between plates = unknown A = overlapping area of...