Recent content by rudy

Thanks for your help (sarcasm), goodbye physics forums. PS "a", "b" etc are labeled in the drawing as your "specs". I'm sure you're familiar with solving such equations so that numbers can be plugged in later. I'm solving for "b". Mass is "m", as labeled in the drawing. It's just a preliminary...

Neither of you are helping me here. Furthermore, you are twisting my words! I said "decide how far away I want to stand" (think Factor of Safety), not "stand with half of my body mass over the edge". If you would like to correct my approach then I am open to suggestion, I came here for help...

Thanks for the feedback - but isn't that the challenge of every engineering question? Once I find the exact location of the cliff, I will decide how far away I want to stand. I concede that the design is far from perfect, it's really just a couple of sketches at the moment.

Hello all- I am trying to design a simple cell phone holder that will be printed using a 3D printer. For this phone holder I would like the base to be the minimum length possible to avoid the thing tipping over backwards. I drew a simplified slope and base which represents the phone on the...

Glad I'm not the only one struggling lol. Thanks for the reference.

Appreciate your patience! Still practicing this summation convention notation.

I see, thanks. So my terms in brackets should really read [1 1 k]; [1 2 k]; etc

Brilliant! Thanks for clearing that up

Hello all, I was just introduced the Levi-Civita symbol and its utility in vector operations. The textbook I am following claims that, for basis vectors e_1, e_2, e_3 in an orthonormal coordinate system, the symbol can be used to represent the cross product as follows: e_i \times e_j =...

Oh snap, thanks BvU. I thought it might be something obvious.

Hello- In the attached screenshot from my textbook, I am trying to understand how they get from equation 6.5 to 6.5a. I have attached my attempt to solve it, but I am stuck evaluating the left side. I do not see how to get their result. Relevant information: k, T_w, T_inf, h and L are all...

Thanks Mark - reformatted

Hi Chester- Went back and reviewed my D.E. textbook on Euler's Method for solving systems. Sorry if it looked like I was looking for a free lunch, I really don't have much experience doing numerical techniques and I didn't recall this method. After reviewing the method I was able to verify that...

That was very helpful, thank you! However, I appear to be hitting another snag. I got an equation for y3 which will not ever approach 1 as n goes to infinity. I will attach a picture of my work, in the end y3 = 6 / (n^3 + C), which approaches zero no matter what C is. Don't I want this to...

Hi Chester, Starting with the first bullet-point suggested in the question I will guess f" = 1 at n = 0. (They say later in the question that this is incorrect but they suggest it as a starting point so I'll go with it) But that's only one point, I can't get f' using that. I have two more...