Glass Definition and 635 Threads

Glass lenses behave in the way it is expected to behave when the medium they are in is a vacuum or air. But if the medium is also glass it obviously doesn’t work as a lens. If the density of the medium is higher than that of glass the lens works in the opposite way. The power of a lens...

My proffesor assigned the question to the class. Will an hourglass filled with sand weigh any different if you tip over (i.e. the sand is on the top falling down vs. the sand is on the bottom not moving) If the sand is on the top. a few grains of sand will be in free fall (these would be...

Hi, I am trying to prove algebraically that light cannot pass across the corner of a right-angled block of glass of refractive index n=1.5. Would someone be willing to let me know whether the method I have used below is valid or not? 'i1' denotes the angle of incidence that the light ray...

http://www.newscientist.com/channel/mech-tech/mg18624931.000

Someone in a physics class here proposed, a white light beam going through a meter worth of glass and because different frequences refract at different angles, a 1 cm rainbow would come out the other end. The only way I see this to be possible is for the beam to be infinetely thin. I mean REALLY...

I was recenlty on the phone with my friend who moved into a new house. The house has been around for a little while...nothing too long. He was on the phone when his mom told him to hang up and look at this. As it turned out, a pane of glass in the bathroom shattered. He looked at it and watched...

Hello, I have a question on resonant frequencies. Everyone knows the example of breaking a wine glass by singing an extended note at the resonant frequency of that glass. My question is: Can other objects be "broken" by this same process? For example, is it possible to produce the...

How can I determine the speed of light from a glass plate? I have the the numbers that I compared the average experimental value of the index of refraction with the general range of the index of refraction of glass.

This question bothered me for some time. From what i have seen in textbooks, dispersion occurs as soon as white light passes from air into a glass prism, but why not for a glass block, assuming that the angle of incidence is the same? The standard answer for why dispersion happens in glass...

High...I'm a hardy Minnesotan which also means I go through some harsh winters. The ice on my car always freezes pretty thick at school. That being said, I want to invent some sort of cool-looking low-heat flame device to basicaly melt the ice very very fast. So I was wondering: 1. What...

Some people must get to write books simply because someone owes them a favor. I'm pretty sure if I went to a publisher and said, "I'm writting a book about high level math, without resorting to actually using math, for people who aren't all that interested in math." My publisher would place it...

if you dropped a steel marble onto a steel plate and then dropped a steel marble onto a glass plate which would you expect to bounce higher?

which collision of marbles is more elastic, steel on steel or steel on glass?

Hi to everyone, I'm new here and this is my first post. I have been reading por a couple of days without nothing to ask/say but I have just remembered an e-mail that a friend sent me a last week. In her mail, I don't paste it because it's written in spanish, she wants me to explain, using my...

A painter has a gallon tin (eight pints) full of yellow paint and another gallon tin half full of blue paint. He wants to mix the paints together so he can paint a room green. He reckons he will need at least 10 pints of paint to cover the walls. Unfortunately, he doesn't have a mixing vessel...

Hi all, I've this question and I don't know how to go about... can somebody pls assist? thanks question: a cylinder of glass 1cm long has a resistivity of 10E12 ohm meter. how long would a copper wire of the same cross sectional areqa need to be to have the same resistance as the glass...

Is it wrong to use a thermocouple to mesure the temperature of glass that will range from 20-300oC? as the range of the thermocouple is much higher, does this make it inaccurate? :confused:

In nearly every physics textbook I've encountered, it is always claimed in the optics section of the textbook that light travels slower through glass, water, diamond, etc. The speed of light in vacuum is divided by the material's index of refraction in order to calculate the "new speed" through...

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?

well, I am sure most of the readers of this forum would agree with me that glass in not a liquid. for the ones who don't -> solids used to be defined as highly organized crystals. since glass is not a highly organized crystal it has been referred to being a supercooled liquid that is still...

Hi, In our class, we were asked whether it's practical to use a magnifying glass to focus sunlight to burn wood. One question really bothers me. Could somebody please explain to me how the focal ratio (focal length of converging lens divided by its diameter) affects the temperature of the...

Hi, In our class, we were asked whether it's practical to use a magnifying glass to focus sunlight to burn wood. One question really bothers me. Could somebody please explain to me how the focal ratio (focal length of converging lens divided by its diameter) affects the temperature of the...

Hello, I was wondering if anyone could tell me the young's modulus of: Graphite, Wood, Steel, Glass, Titanium, and Aluminium... I know this is a strange thing to ask, but it would really help me understand more fully the way Graphite compares with other materials. Search engines...

hey guys i found this little bit of info about glass and i was wondering if it is true or not. the statement was: So is this true? and if it is can some one please explain it to me. Thanks allot Pinky

It may seem like an odd question, but why is glass see-through? What properties of glass (and indeed light) make it possible for us to see through glass? Has anyone else ever wondered this? Thanx

I have never really thought about so any help would be great.

A glass marble is dropped down an elevator shaft and hits a thick glass plate on top of an elevatior that is descending at a speed of 2.0 m/s. The marble hits the glass plate 3.0 m below the point from which it was dropped. If the collision is elastic how high will the marble rise, relative to...

Ive heard some arguments for and against glass being a liquid. But what is it officially?

I don't even know where to start with this question! Two coherent sources are traveling as shown below. Find the minimum thickness of the glass (n=1.51) for the waves to be out of phase at the screen

probably a stupid question, but that's what I'm there for... if light travels slower through glass than through air or vacuum, would time be going slower for me if i were sitting in a block of glass?? thanks. cucumber.

New Glass. There's a new glass in town. The glass, developed with the help of a unique NASA levitator facility, is available for numerous commercial applications including lasers and optical communications. "We have patented a family of new glasses and have established processes for making...

Why is it that when you put a cork in a glass of water, it won't float in the center? ~Kathleen

Does anyone know why glass is transparent?

"glass" is a solid material with an amorphous internal structure. http://science.nasa.gov/headlines/y2003/14apr_zeroglass.htm So does it imply that if I have 1kg egg shell, and I heat it to 2000 F and cool it immediately before the atoms arrange themselves regularly again, then I can...

When you hold a certain piece of glass up to the light... Hi, My question is thus: When you hold a certain piece of glass up to the light, the light coming through it appears blue. But when you shine light on it, it has a yellow color. What's going on?