Recent content by dawin

When I was in college there was a modal research group which was looking to correlate FRFs to structural damage, which you could argue could include effects of aging. In general, you're assuming that damage affects local stiffnesses which in turn affect your final modal response. I think what...

As someone has mentioned, you need a mold. However, how you plan to make the carbon parts will affect your mold design. Also, do you plan to have just one piece, or will you be joining them? You can make carbon fiber tubes pretty easily. If you're hand-laying up woven fabric, at this point the...

What are the boundary conditions for this particular problem, and why are you trying to use an explicit method? Is there a particular reason? I don't see your explicit formulation, only a first-order approximation to the partial derivative. Depending what information they give you, I'd think...

Well that was an easy sell, haha. I think between the ones I listed, the book you gave, and the Irodov book (General Problems in Physics)--the last one has quite a few solution sources online too (that go into more detail if needed--I should have plenty of work to do.

That looks like a good book. I like that they go through the solution in some detail instead of essentially going, "Here." I'll pick this up and probably combine with some of the other books I've found. Thanks! For me, I'd like to improve my ability to "think" in DEs -- I watch some people...

Thanks for the comment. I do have this book and agree it's well laid out. Now I'm looking to stash some practice problem books so I can get a better grasp on applying the material I'm learning. After all, practice makes perfect. Or, perfect practice makes perfect. However it goes.

I want to develop my feel for reading/interpreting differential equations, particularly in Physics applications (for developing models and understanding ones that others have developed). Are there any good books out there that present problems that require deriving governing differential...

iBooks is plenty capable of reading PDFs, and storing them in the library. Granted, I've been experiencing a bug where all of mine have disappeared, but admittedly haven't looked into it too much. Worked fine up until that point, and on new PDFs, though.

I get 1.84 * 106 km (GM/(R\omega)^2)... 1.84 * 108 seems like a large number... 25% further than the distance between the Earth and sun.

I've never played the game, so I can't really speak to how it works out. Where did you see the physics engine? Why not identify some parameters and come up with an empirical solution from some mini design of experiments!

Well it looks like you have just the force balance there. Have you considered looking at conservation of momentum too? You have an \dot{m} term in there... if the "rocket" starts out with mass m, and loses a bit of propellant going in the opposite direction (staying consistent with your model's...

Is there a reason you can't make assumptions for the one of the terms on the right hand side? For one, it wouldn't be unreasonable to assume F_T is a function of \dot{m}. But not sure if how you laid it out is just how you wanted to approach the problem.

I don't understand what you mean by needing sampling points, etc. to achieve an accurate description of this system. Could you explain more clearly? My understanding is that you have some arbitrary gear system that you'd like to mathematically model so that at any point in time, call it t...

Is it possible to run an engine off the combustion of hydrogen? Yes. Using what method it seems like you're propsing? No. I'd agree with russ_waters. It look like you're going in the direction of what sounds to be a perpetual motion machine. Could you separate water molecule into their...