Recent content by farso

Thats amazing, thanks. I hope I have now got it correct. So... F(\rho,\varphi,z) = \rho cos(\varphi)\widehat{i} + \rho sin(\varphi)\widehat{j} + z\rho^{2}\widehat{z} and \widehat{\rho} = \widehat{i} cos(\varphi) + \widehat{j} sin(\varphi) Subbing that in I am just left with...

I have searched my notes, and my textbooks, but do not have anything which seems to cover this. Is there a particular name for this operation that I may be able to search up and check out some examples? Thanks

Sorry, I am unsure what you mean here? Ok, I think I see what you mean here... Would it be: \rho \leq 1 x^{2}+y^{2} \leq 1 = \rho cos^{2}(\varphi) + \rho sin^{2}(\varphi) If this is correct, I am still unsure how to get \varphi? Thanks for the speedy response!

Homework Statement Hi I am converting from Cartesian co-ordinates to cylindrical co-ordinates systems and can do the conversion fine, but am unsure about how to convert the limits. Q) Region V is given in Cartesian by: F(x,y,z) = xi+yj+z(x^{2}+y^{2})k Where x^{2}+y^{2} \leq 1...

Hi Thanks for the speedy reply! Looking at it again and the definition of greens theorem I am not entirely sure why I chose to try and use it. Are you suggesting that I do it as: \oint \nabla \theta (x,y,z) dr = \int_{0}^{1} \nabla \theta (x,y,z) dr_1 + \int_{0}^{1} \nabla \theta (x,y,z)...

Hi everyone. I am going through examples for maths exams and am unsure on the final part of a question I am attempting so hoping you may help me? Homework Statement "Let C be the closed, piecewise smooth curve comprising individual curves C1 and C2 defined by r1 = (x, x2, 1) and r2 =...

The way i have always done it is through Kirchoffs law.. using I1=I2+I3 then replacing the terms with ohms law V=IR and in the end getting a load nice simultanius equations, one for each loop of the circuit, in your case three. I you don't know this method, Ill explain more if needed? The...

Ah, there's my problem! I did asin(0.1) to try and actually figure out the angle which θ related to. Thanks very much for all your help!

Sorry, i copied and pasted and it was theta before that. Still can't get this working right, I am using wx=mg sin(theta) to get component force but it still falls short. I am really sorry if you think I am being slightly dumb here, I just don't get this problem at all and its always the way...

Ok, I think i may have got this now thanks to tiny tim! Tractive force id calculated to 6000 using tf=p/v the resistive force was calculated to nearly 4000 using fr=kV and the weight of the vehicle is naturally 2000kg Therefore using your equation, this proves k to be 333.3 Please...

Ok then, work so far... a) work = force*distance power = work/time therefore power=(force*displacement)/time as displacement/time = velocity power = force*velocity tractive force = power/velocity b) Ive tried calculating each force acting upon the vehicle if the surface was...

I assumed instant acceleration to max velocity, and i know that they are all in equilibrium, I am just having real difficulties proving that coefficent f is 333.33... Have you got any hints on how this might be proved? Thanks

Thats great thank you! I'll include units and also a verbal definition of what I've shown to make it clear. Quite honestly, I am having trouble finding a way of working out resistive force, seems like the term isn't used very widely? Naturally i know that F=mg, but I can't make the link...

Hi everyone, just found this place and think its a brill idea that people can get extra help outside of class! Hope one or two of you can assist me with my problem! Thanks! Homework Statement 3) (a) Define the terms Work and Power. Derive an equation relating the power developed by an...