Rubber Definition and 242 Threads

Considering how quirky the theme is, we have a very good group of pictures for this contest. Please vote for the picture that best represents our theme - Rubber Eraser! 1. Chi Meson 2. scorpa 3. Physics is Phun http://img263.imageshack.us/img263/4233/img2695pm1.jpg 4...

In my physics book it says that friction between cars and air can cause a build up of charge on the vehicle's body and that's why a rubber strip is often connected from the body of the car to the ground - to ground the car. Since the tyres which are rubber are connected to metal which is...

[FONT="Comic Sans MS"]Rubber Eraser This is silly enough, and trivial enough, that I just HAD to include it in our contest. April 15 is, get this, http://www.holidayinsights.com/other/rubbereraserday.htm" here in the US! Honest! You can't make these things up! So, to mark this joyous occasion...

i need some help. i am supposed to design a vehicle that is powered only by one standard rubber band to transport an egg to the greatest possible horizontal displacement without breaking the egg. the vehicle can't have any rotating parts. must be constructed from basic parts (ie not...

im to design something, a plane, or any kind of material to let it stay from the time of release up to it falling into the ground for 13 seconds provided that it is powered by a rubber band... i'm having a hard time thinking about it, having it stay in mid-air longer than usual, and just want...

Homework Statement So a 2kg block hangs from a rubber cord and it's being supported so that the cord is not stretched. The unstretch length of the cord is .500 meters and its mass is 5.3 grams. The spring constant for the cord is 105 N/m. The block is released and stops at the lowest point...

If you have a rubber band wrapped around a cylinder, how can you tell the tension in the band? What parameters do you need to know?

Suppose you have a weight hanging from a rubber band and you heat up the rubber band, will the weight go up or down? from grade-school the answer "down" was pounded into my head - obviously - when something is heated it expands! but yesterday i was reading the Feynman lectures and in the...

A child slides across a floor in a pair of rubber-soled shoes. The friction force acting on each foot is 25 N, the cross-sectional area of each foot is 20 cm2, and the height of the soles is 5.0 mm. Find the horizontal distance traveled by the sheared face of the sole. The shear modulus of the...

I need to prove that the distance of an object launched by a rubber band decreases as its mass increases, algebratically. Can anyone help me? Thanks.

A small rubber wheel is used to drive a large pottery wheel, and they are mounted so that their circular edges touch. The small wheel has a radius of 2.0cm and accelerates at the rate of 7.2rad/s^2 and it is in contact with the pottery wheel (radius 25.0cm) without slipping. Calculate: a) the...

hi, i am doing a level physics in the uk(first year of the 2), we are doing this big coursework on the materials, where each member of the class is supposed to choose a material and make a big report on it, with plan, report, predictions, and in the end we have to have a microsoft presentation...

I am doing some work with tension forces and applying different masses to different items like strings. We did some things with rubber bands too. I am having trouble with one of the questions posed. "In general, in order for a rubber band to pull back, what does it have to do?" I want to...

Here's a cute problem I came across recently. Suppose you have a rubber band with spring constant k, mass m and unstretched radius r. Now suppose you have a frictionless cone and the angle of the peak is 2 \theta (that is, if you project the shape of the cone onto a plane it looks like a...

Imagine that now i have a can. I poke a hole at the centers of both the bottom and the cover of the can. Then i tie a rubber band onto the holes that it goes across the tin from the hole at the bottom to the hole on the cover. After that i stick some plasticine onto the rubber band. When i roll...

What would happen if you didnt tie that rubber while the needle is in your arm gathering blood. Would it spray a lot faster or not at all?

Greetings all... When I pull a fairly good size/quality rubber band and then quickly hold it against my lips, I feel it to be quite hot. I assume that some of the energy used in stretching the rubber band is converted into heat by virtue of the properties of a "rubber band" My question is...

Hi all. I have something of a problem in my understanding of a current lab experiment that I am doing in my second year. The experiment is set such that we explore the elastic properties of an elastic band through small and large deformations and measure the force that it exerts on the...

Set-up: Rubber band modeled as an Ideal chain (polymer) with Nr (links) monomers pointing right, and Nl monomers pointing left each of length l. Find expressions for the length of the band, its statistical weight (iI think that means the multiplicity?) and its entropy, in terms of N[SIZE="1"]r...

Hello, i'm currently doing a project based on the theme rubber, specifically the friction/texture of rubber. so I'm just wondering, what gives rubber the "rubbery" texture that it has (chemically, structurally, etc.)? any links to good sites would be helpful! thx, jen.:rolleyes:

Hi All Suppose we have a rectangular pool filled with water. But the concrete ground of this pool is substituted by a rubber sheet, resistent obviously to the weight of the water inside the pool. Now consider we produce a plane wave traveling along the greatest dimension of this rectangular...

Well i have been assigned a project in my physics class that is totally clueless to me so i have come to all you smart peoples to help me with it because I am like totally clueless of what to do... I am to create a rolling device powered by (a) rubber band(s) (no engines, etc)...

HI guys. I am facing a problem that is quite interesting but quite complicated to explain. so would like to ask some help. the problem is talking about the boucebackability of three different balls. Tennis ball , glass ball and rubber ball. there is one little boy claims that the glass ball...

My materials professor told me the restoring force of rubber increases with temperature because of entropy. At normal solid forms because the structure is energetically favorable. He says the unstreched state is entropically favorable. Is this reasonable? I plan to test it this weekend when...

Okay, here's the deal. 2nd day back at college and I pretty much have forgot most everything Physics related already :rolleyes: Had a very easy assignment today in one of my engineering classes to take two dowels and a bunch of rubber bands and build something that could launch/throw a...

A 100 g ball is attached to a rubber tube and is spun around in a circle at a rate of one revolution every second. A force of 0.5 N is required to stretch the tube 1.0 cm. If the original length is L = 1.0 m, what will be the change in length of the rubber tube when the ball is revolving...

Can "spacetime as a rubber sheet" be taken literally or merely as pedagogic? Doesn't a literal interpretation imply that gravity is not a "force" in the usual sense, but merely a consequence of how the space is shaped? Unless the potential energy content of the rubber is counted, perhaps. (I...

Hello everyone My phisicsproject for school is to test the strength in every rubber band in a bag with new fresh rubberbands. The problem is i can't really understand how I should do this test, and i hop you guys can help me out. //daniel :confused: <-- me right now :-p

I have found a website which claims that rubber bands obey a force law F=-kT(x-\frac{1}{x^2}) x=\frac{L}{L_0} While this is similar to Hooke's Law in the sense that it *almost* approaches it for large values of x, it is also quite different. Can anyone confirm or deny the formula's...

Two physics students are having a debate about the best way to define a force scale using rubber bands. Each one is trying to convince you to do it their way. They have the following apparatus to use in tests: A bunch of identical small rubber bands 10N spring scale meter stick Joe...

I read recently about an analogy to how general relativity tries to picture gravity. Its the one about a rubber sheet and a heavy sphere placed on it deforming it to cause a depression.Another ball in the region will tend to move towards this depression .But doesn't this assume the existence of...

Okay, here is the question, I am a little clueless on where to start, on how I would go about solving this. Any help is greatly appreciated. Thanks The rubber worn from tires mostly enters the atmosphere as particulate pollution. Estimate how much rubber (in kg) is put into the air in the...

“Smart skin” http://www.popsci.com/popsci/science/article/0,12543,676853,00.html

This has caused me to be very confused because at one time i did an experiment, the rubber band followed Hooke's Law, but at another time, it does not. When I search the internet, some websites state that such experiments are only correctly done when the force is linear with the extension...

As you all know, rubber balls (tennis balls) do not bounce good if there are holes in them. Why is that? I have 2 ideas as to what it is but I'm not sure which one. 1. The rubber cannot compress properly so the ability for the rubber to store elastic energy is gone. 2. The air inside of the...

OK, maybe this is an odd question, but here goes: When I pull on a rubber band, is the force I "feel" the resistance to co-valent bond separation? Am I actually "feeling" electron forces?

I need help. I need to design a device to transport a 1kg pass ten meters over a level surface using the energy stored in a #10 rubber band. I decided to use three wheels at the structure, and i created a car with a basswood top and the rubber band is wounded up at the rear axel to get power...

A Rubber Band?? OK...i need your help people... i have to construct a vehical that can transport a 1 Kg weight over 10 meters using any materials i please...here's the catch: Its only source of power can be a size-10 rubber band! It can have no other source of power and it cannot be launched...

what is the coefficient of static friction of rubber on wood?

Hi all. I have a question. How do you show the difference between stress (pressure) and force? We were given 2 short elastic bands, 2 long elastic bands, and 2 paper clips. Idea that came up was to tie one elastic band to 1 weight (anything). Suspend it. And measure length of elastic band. Then...

a 2kg block hangs from a rubber cord. the block is supported so that the cord is not stretched. the unstretched length is .5m and its mass is 5g. the spring constant is 100 N/m. The block is released and stops at the lowest point. a) determine the tension in the cord when the block is at this...

I have a circular motion lab, in which we spin a rubber stopper attached at one end and a mass at the other end of a string. We calculate the period by the recording the time it takes for 20 revolutions. And we figure out the force Fc. So we do three different graphs: one for Fc vs...