Recent content by Redoctober

Hi ! I have recently graduated with a BSc in AEing. I published an article, won an international design competition, and graduated with a perfect CGPA + honors. My original plan was to work for 3 years for experience then join an MSc program to specialize in the topic. Yet it has been around 6...

Pretty much like boneh3ad said. Having the 1/2 makes the Aerodynamic coefficient wrap up in a nice manner ## C_L = \frac{L}{qS} ## with the dynamic pressure. It's really convenient this way especially when it comes to application in Flight mechanics, Stability and Control.

The definition comes from the following mathematical model, ## V_{avg} = \frac{\int_{t1}^{t2} \vec{V} . dt }{t_2 - t_1} ##... 1 dimensional so ## \vec{v} = V \vec{i} ## It happens that the integral of the Velocity vector dot the time to be net distance between starting and ending point...

Usage of gc would make sense. actually, but in case if i use it, would it be always set in side with the force, For example ## F g_c = ma ## where F is set in lbm and F as lbf.. Can i conclude that the Weight is taken as lbf but mass as lbm. Yet their magnitudes are same. When i substitute to...

In american high schools, The mass is inserted to the F=ma as slugs ?! ... Its cruical because in Aerospace Eng. Variables such as the Dynamic head ## \frac{1}{2} \rho V^2 ## which is typcally used in non-dimensional analysis in Lift... If in american system, Lift is in lbf which is pretty much...

So if I say a car is 1 lbm and is accelerating by 5 ft/s^2. Then force is 5 lbm ft/s^2.. Is there a label to this unit ? Something that symbolise Force. Then what's the force in lbf .. 0.155 lbf ?

Ok i am too confused with these american units. I have a couple of questions about them Q1) Is lbf a force. Is lbm a mass. If yh does it mean 1 lbm = 32.174 lbf. Q2) Is lb equal to lbm or lbf. Q3) Is lbs equal to lb or lbm or lbf. Q4) Let's say 1 lbm = 32.174 lbf. and from many sources i...

Thanks a lot for your replies. I am sorry that i am late to reply. Unfortunately i had a busy week filled with midterm exams. Now, i am trying to find the gaps where i have problems regarding the nature of partial derivatives. I found out the following. Lets assume a function such that...

I have been trying to convert the Del operator from Cartesian to Cylindrical coords since like 5 days. but still i can't see why my way doesn't work. It worked for the 3D heat equation and 3D wave equation but for vector quantities no :( ... This is the way i followed \nabla P =...

V = \int \frac{x}{(sin(x^2))^2}.dx I tried to solve this by parts or by substitution but that doesn't seem to work. Any Idea how to solve it :/

Thanks a lot :D !

How do i integrate this ? ∫ (x/(x+2)) .dx Any idea ?

Oh i c :D ! Thanks a lot . I wasn't aware of shifting the origin :) ! Thanks :D !

I need some help in this The question states find the volume for the region bounded below by z = 3 - 2y and above by z = x^2 + y^2 using cylindrical coordinates . Now i tried to do it but i got stuck with the part where i find the radius . i found r^2 = 3-2r*sin(zeta) :( its hard to...

Its alright i found out the solution It turns out, because f(x) is divergent , i shall choose a smaller function g(x) but diverge too i chose g(x) = \frac{e^x}{e^x + 1} \int^{\infty}_{1} \frac{e^x}{e^x + 1}.dx the integral is easy to calculate . It will give infinity ...