Recent content by VooDoo

Homework Statement the sulphur atoms in the self-assembled monolayers are ~ 4.99Å apart, and that they form a hexagonal close-pack structure, estimate the number of functional molecules/cm2 of the substrate Homework Equations 1 angstrom = 1.0 × 10^{-10} metres Area of hexagon =...

Hi all, Trying to design a simple gate for the side of our house and in order to select the size of the square tube for the frame, I need to calculate the forces in the members of the frame. I have tried the method of sections and joints, however both do not seem to work. My next...

Apologies, just realized I posted this in the wrong section, was ment to go in electrical.

Looking into “reverse engineering” a pump and running it like a turbine and using an induction motor of some sort generate power. Basically design/build my own micro-hydro power system. The system if I do go ahead with it, will be connected to the grid. I am very capable of handling the...

Hi all, Need a bit of help with a problem. I have a 4 inch pipe (carrying water). On the end of this 4 inch pipe is a 2" orifice. Now flowing through this orifice is water at 50L/s at a head of 100m (790 GPM and 330 feet). Basically as you can imagine, there is a lot of energy behind this...

Hey guys, Thanks for all the replies. I ended up having the test for this subject and the question was a bit different to what I was expecting. I have attached an image similar to that of the test question. Basically the question asked to explain what would happen to the angular...

Thanks very much for the replies. To be honest, I originally had FBD 2 down, but then the thought of the link being in compression threw me off for some reason. But the logic behind FBD 2 kind of makes sense out. Just for the sake of learning, I have drawn up an arbitrary arrangement and...

Hey guys, I have a counterweight that connects to an L-shaped link that pivots about a point. I need to work out the moment at the pin due to the counterweight, but I am stuck on the basics. The first free body diagram I drew assumes that the weight of the counterweight acts entirely...

Thanks for the reply. The piece of metal has just been exposed to the outside environment and is not in a aqeuous environment. So would it be correct to say that the build up of calcium has no major negative effect on the metal besides maybe effecting its visual apprearance? Whereas a...

Hey Guys, Just curiosity, but if a metal surface has a build up of calcium does this mean there is a higher chance of corrosion occurring? Or can it accelerate corrosion? Or is the build up on the surface of metal generally harmless?

Hey guys, I was just wanting to know, if there is a special way to add a damper in spring in parallel (as per the image below). i know that springs in parallel is; 1/k(total) = 1/k1 + 1/k2...

Hi guys, I am a mechanical engineering student and before the end of this year, I must select final year project to do research on. I am really interested in renewable energy and have a particular interest in wind energy/wind turbines. I am after a project that will require me to do site...

Hey guys, Just a bit stuck with getting enthalpy values off a table I have in a textbook. If we look at R-22 for example, the textbook gives me different answers than what is available on the net. If I use the values that are given to me on the net I get the correct value. The blue...

Hey guys, A picture of the question is attached, I am not seeking answers just an explanation of some theory. Now I understand that point A will be under compression due to the weight, tension due to the bending and shear due to torque produced by the wind point b will be under compression...

Cheers guys! Quick question, I understand that the first building that is producing the vortices can vibrate if the frequency of the shedding is close to the natural frequency. If the second building is close to the first building can this potentially vibrate as well? Also if the buildings...