Recent content by luznyr

Thanks for your help, didn't end up needing to multiply them just required a lot of tedious manipulation!

Ok cheers, I did try that but I couldn't get it. Will have to try again, thanks :)

"multiplying equations" - spiral coil heat transfer Hi, I was wondering if anyone could explain to me what is meant in this article by "Multiplying equations 8 & 9". I have both equation 8 and equation 9 however I cannot seem to work out how to get equation 10...not sure if it's something...

i have no idea if either of my answers for d or e are right, hence why i stuck it on here...im just so confused haha

im not too sure what you mean question three sorry, if by part C, then I'm not too concerned about that for the moment, just part D and E

Homework Statement the problem is in the attached file, I am having trouble with part d and e. cheers. [the answer for B is mr^2(0.5-16/9pi^2)] Homework Equations The Attempt at a Solution i won't upload all my working as i have stuff everywhere but for part d: i got my...

alright thanks for that. the removal of the holes was a later part of the question, and the parallel axis theorem can be used for that.

Yes, the letter T is the vertex of the triangle. It's not for a calculus course but the problem states that we need to use integration.

Homework Statement Find the mass moment of inertia about the tip T (into the page). All dimensions are in mm, and the density is 7820 kg/m^3. The thickness of the triangle is 10mm Homework Equations The Attempt at a Solution I tried to do a triple integration over dV (as density is constant)...

hey, thought i would do this question randomly for some exam study, here's how i did it (not sure if its right, hopefully is though, lol). EDIT: sry stuffed up my working, here new working

yeah sry bout the genius thing, thanks for the help anyone, much appreciated

haha yep ty

ok that gives x(7y+4) -2y= -5, 7xy+4x-2y=-5, so how do i get it back to y= then genius?

Homework Statement Find inverse of f(x) when f(x) = (2x-5)/(7x+4) Homework Equations none The Attempt at a Solution x=(2y-5)/(7y+4) and then i get stuck trying to rearrange back to y=...

for the first problem u could use logs to differentiate such that lny = 1/2ln(z-1) - 1/2ln(z+1) and then implicitly differentiate, dy/dz.1/y = 1/2.(1/z-1) - 1/2(1/z+1). dy/dz=[1/(2z-2)-1/(2z+2)].y = [4/(4z^2+4)].root[(z-1)/(z+1)] and simplify. u = sin2x therefore y=tan (u) therefore dy/du =...