Recent content by Rusty789

Its a higher national certificate, a british thing, I'm right in thinking this is mainly american? Differentiation is definitely part of the next topic so maybe it was just to see how we'd handle it..

I'm doing HNC in electronics, and this unit is called analytical methods.

Firstly I have no idea how to tackle this one, I am not sure if we've been taught it yet or if its sort of a lead on to the next set of topics.. Homework Statement The shear stress t in a shaft of diameter D under torque T is given by t = KT / \PiD3. Determine the approximate error in...

I've done this now, thanks for the help.

I can only remember one of the ways i did it, as said i forgot to bring my paper work with me! :rolleyes: I first rearranged it to give me: (i/12.5)-1 = e-t/CR Which then i made the left hand side of the equation G to make it easier for me (this may be were i went wrong on this one) i...

Homework Statement i = 12.5(1-e-t/CR) Current = i Resistance = R Capacitance = C Time = t Firstly i had to calculate the current flowing after 0.5s, given a 30k\Omega resistance and a 20µF capacitance.. easily done. Then i had to work out how long it took to reach 10A, so...