Materials Definition and 919 Threads

okay, I've been banging my head against a wall for a few hours. It's a bit difficult to describe but here goes... There is a rope being pulled up with force P. The bottom of this rope is tied to a bent bar. The bent bar is shaped like an upside down U with the two ends stuck in a piece of...

Hi, I was wondering why some plastics seem to shrink when heat is applied? Does the plastic expand when it is colder? Is it some how due to the molecular bonds in the material rather then the ionic bonds in something like a metal that expands when heated? Thanks Derek Mohammed

What are, and the diffrences between p and n type materials?

I just wondered, that our view of how the universe is is ussually WRONG. We've made zero-viscosity fluids, materials with no electrical resistance, and just all together "non-sense" things. Is anyone willing to suggest then that there are materials that do not provide friction(when...

:smile: Can anyone give me the website?

I wanted to do an experiment that had to deal with thermoeletric materials, and the out but of electricity. Does anyone know of a common thermoelectric material? Maybe somthing around the house? If not then just name off what you know. I want to see the output of electricity compared to the...

I'm wondering why the amorphous phase materials have wider bandgap compared to its crystalline phase. To my best knowledge, the bonding mechanism does not changed as the material transform from crystalline phase to amorphous phase. So what causes it has larger bandgap? ST

how do you build & design a bridge with these materials? 4 drinking straws 10 pieces dressmaker's oin 5 pieces of 5-peso coins (the bridge should be able to withstand the weight of these coins) 1 short bond paper and a 1 meter sticky tape Anyone who has performed this project...

how do you build & design a bridge with these materials? 4 drinking straws 10 pieces dressmaker's oin 5 pieces of 5-peso coins (the bridge should be able to withstand the weight of these coins) 1 short bond paper and a 1 meter sticky tape Anyone who has performed this project...

umm i got some silly question to ask , i just couldn't find a good answer by my self. 1. is my body made up with atoms, ? i don't really think so, so what's my body made of? i mean my flesh. 2. wats is a piece of material such as wood or gold, made of, ? i mean when u cut down to...

For years I heard all sorts of promises about materials made in space. An alloy of lead and aluminum was often mentioned as a favorite. What is the state of this technology? Are things looking as good as promised?

i'd like to know about the materials that were used to build the hull of the titanic?...i'v googled it,,, but i suck at finding info so bad, can anyone help?

deleted. GO

So thinks the researcher in the second link. http://www.aip.org/enews/physnews/2003/split/660-3.html http://www.zoology.ubc.ca/labs/biomaterials/slime.html

Can someone give me some information about laminated materials? Is a bar of steel made of many layers, for example, stronger than one solid piece?

I don't know if this is the correct section or not, but I'll let hosts and mentors decide that. My question comes as a result of hearing a number of things floating around as to the possibility of mining asteroids for materiasl valuable to space colonies. Do many asteroids contain...

Experiments to describe the band structure of bulk (solid) materials? I just want to know the name of some of the most used techniques to describe or obtain information of how the band structure of the material is. Not by theorethical calculations, just experiments. For example, let say I...

Seeing as no-one has posted any good geology books, I'll recommend some of my favourites... The Fossil Trail, Ian Tattersall - an excellent summation of Human evolution, a little bit out of date now. Trilobite, Richard Fortey - how he makes a whole book about small arthropods interesting...

Hello, 150kcal of heat raises the temp of 2.0kg of material by 400 degrees F. Whats the materials specific heat capacity? I cam up with 1.35 kcal/kg degrees C. is this correct? Thanks! Dx :wink: