Plastic Definition and 278 Threads

I was doing some research online, about making plastic, and I came across a tutorial explaining how you can use milk and vinegar to make plastic. I basically want to be able to make sheets or molds of objects. I don't really know what questions to ask, I don't really have any background in...

Why is it that when I fill my plastic pure water drinkbottle with chili water from a drink tap, the whole bottle becomes a little wet even if I did not spill water onto the bottle?

A plastic pipe has an inner radius of a = 35.00 cm and an outer radius of b = 71.00 cm. Electric charge is uniformly distributed over the region a < r < b. The charge density in this region is 30.00 C/m3 A)Calculate the magnitude of the electric field at r = 0.44 m. B)Calculate the...

At my work the students are supposed to keep their student IDs on them at all times and show them to whom ever is at the entrance when they come through so we know that they are students. Now my boss doesn't seem to really care whether or not we know they are students, he wants us checking...

hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii wish for ur help please i want to detalied description of plastic sheets calendering and extrusion processes. (pdf files prefered) thanks alot

hiiiiiiiiiiiiiiiiiiiiiii please could u inform me about plastic sheets manufacturing processes (pdf files prefered) thank u industrial engineer:smile:

Does anyone know a good product that will glue plastics back together? The plastic is... well... pretty much the kind you'll find on, oh, let's just say, my mothers computer case. It also needs to set somewhat fast because i'd have to hold things in place :mad: And while we're at it, does...

"PLastic Surgery" as a form of expression I ride Motorcycles a lot,,, I also crash motorcycle A lot... ussually my body do just fine but sadlly the bikes end up suffering a little more, so over the years I develope a varaity of ways to keep them running without replacing parts every time...

the reason i ask is that i will be getting some tools cryo'd and am wondering if it will affect the plastic and rubber? im thinkin i should also take out springs as it may make them too stiff? any help would be great!

can a plastic conduct? why or why not? help..

I have some crystallized sodium hydroxide drain cleaner that I want to use on my bathroom sink drain, but I just put in a plastic drain and the trap is plastic as well. The clog is past the trap, somewhere deeper. So will the NaOH be alright with the plastic? Not sure exactly what kind of...

Dear all, I got a problem to justify the stacking height of bottles crates where locate at the public area. As you may see the attached photo and draft as reference. The pattern of stacks like 4x10, 4x9, 4x8...(horizontal placement) or 2x10, 2x9, 2x8... (vertical placement)...

can a radar detect a plastic object? could the uhf and microwave signals be reflected by the target if it's made of plastic material? please give justifications :smile: thanks.

1.Will a charge be induced on a plastic-made object if a charged metal is put near it? 2.Is the sharing of charge between two conductor(placed on a insulator) is considered as a current? I think charge can be induced similar to the way in which charged is induced in water. But, I am not...

Recently i got an offer from a company which asked for finite element analysis and design of ultrasonic welded plastic parts. I didn't know that but nevertheless i want to study that. Can anybody help?

Ok, I was getting ready to go fishing the other day, when i noticed that my plastic sinker container was melted, but i didn't know how. I then noticed a type of artificial bait (powerbait to be exact) seemed to be the culprit. I did not know how this could have happened, being that i didn't...

does anyone know the best way in which to attach pvc with pvc? this is for a boat, so it must be as strong as possible.

This is for my Hard SF world so the questions aren't limited to today's technology level, just someday. How plausible is a plastic explosive 50 times more powerful than C4? Is C4 even the strongest chemical explosive per amount? What does the speed of the burning of the explosive have to do...

I wasn't sure whether to put this in bio or chem, so I put it in bio. Environmentalists always argue that plastic takes thousands of years to break down, so is there any way to turn large amounts of plastic into something that doesn't harm the environment? Are certain bacteria able to break...

Help Now Please! What happens to a sound wave and a light wave tht are trying to pass through a piece of plastic. I think that the light wave slows down and may eventually stop and thre sound wave will get faster. Is this for which of the following reasons: A. Sound travels faster...

Please consider this problem: A plastic slab of thickness t has a uniform free charge density, +rho, embedded inside, and also one surface has a surface charge of -sigma. Find the electric fields here and sketch as a function of distance from one surface. Also find the potential as a function...

I am designing a machine called a Ring Expander. Simply put, it's a machine used in metal forging operations to stretch metal rings (15 x 15cm cross section, 30cm inside diameter, 60cm outside diameter) by about 20mm on the diameter. It does this by forcing a cone through a set of jaws, which...

What are some of the more unusual planetary compositions you can imagine? I envisioned a planet embodying exuded, colorful petro-plastics - like a "Lego Land." Earth itself is pretty strange with its lifeforms. I guess science fiction is replete with creative orbs.

Hi, I'm doing a project where I need to find the velocity after penetrating a certain thickness of polycarbonate. What equations do I use to find this. Thanks

I remember learning that in mixtures if the particles were small enough light would go through and make it trasparent, my question is how/does this relates to things like glass or trasparent plastic? What at the molecular level makes something transparent?

Hello! I'm making some home-made capacitors for an up-coming lab, and I was thinking of using Market Basket/DeMoulas' plastic kitchen bags as a dielectric. I'm really hoping to use it because the packaging info includes the thickness of the bag (19 micrometers), which should increase the...

You go to the store, make a purchase, proceed to pay and what does the clerk do? They take out a pen and "mark" your twenty, or ten, etc. Makes you feel like a criminal. Plastic money? HMMMM, I am not really a fan of it. It is easier in some respects using your debit card, etc. The problem...

A question, I have a plastic disc with a coil wound around is axis of rotation. The coil carries current I. Now the disc carries charges at its circumference. Now the current flowing in the coil is brought to 0 instantaneously. This creates Electric Field to be produced that travel in...