Recent content by DrMath

I think a trick in handling trigo qns is to convert all to sine and cosine functions. since sec, csc and even tan functions can be derived from sine and cosine. Do remember this to help in your future sch works as well.

Homework Statement Hi, Is the answer = 0.05 / s+0.05? Any quick steps to determine H(S) from cursve like that? Homework Equations The Attempt at a Solution

Homework Statement Hi PF frens, I've got the attached picture translated into differential equation representation. However, not so sure how the r(t) and f multiply dee-y / dee-t comes about. Kindly advise? Homework Equations The Attempt at a Solution see attached jpeg.

Laplace Transform is just a means engineers convert representations in time domain into frequency domains in engineering. Things in time domain do happen in frequency domain. as F= 1/T. Convolution (which is complicated) in the time domain means multiplication in the frequency domain - which...

Homework Statement Hi, I have a problem to find the reverse saturation current for a piece of diode. I have a question - given conductivity, a I-V curve with forward bias information (a table of I vs V values), how can i proceed? I have other information abt the diode such as its mobility...

Dear PF Friends, Given the system to be controlled. I'm stuck in finding the inverse laplace (to find y(t) from Y(S)) - any advice?

See attached. Not very sure how to proceed.

if you get "0/0" - you should always use L'Hopital Rule. Note that "0/1" or "1/0" results you shouldn't use... :)

attached

But as i proceed... Say at the 3rd time.. it becomes (as attached). Hmm.. so i assume after up to 13 times differentiated; is should get things like: - K sin (2z) / z^14 + ...+ ...+ - (Last temr -ve here) ------ by pattern matching. (well, if i take limit term by term; this term gives...

Laplace Transform? Don't quite get what u mean :P

Thanks tiny-tim oh.. how to become a Homework Helper here?

i find it very tedious to work out 13 times... :redface:

thanks

Homework Statement is: >= 1 valid for a circle equation? See attached? Homework Equations reference attached The Attempt at a Solution reference attached