Rubber Definition and 242 Threads

Does there exist a known process to devulcanize rubber (i.e., getting out all the sulfur crosslinks from the polymer chains) and get out of the process rubber that can be revulcanized? Or does one big slash on a tire mean that 20-30 pounds of rubber can never be used for making tires again?

Hi to all I am new to this forum. I need some help. I want a chemical reaction which produces a harmless gas with the use of small amount of reactants. Thanks Shashank

Homework Statement A 18g rubber stopper is suspended by a 45-cm string from the rear view mirror of a car. As the car accelerates eastward, the string makes an angle of 5.1 degrees with the vertical. Determine the acceleration of the car. Homework Equations The Attempt at a...

okay guys I've been looking for ages and i just can't find anything that will help me with finding a distance that will be travel by a rubber band powered car. I've been playing around with kinetic energy= potential energy but i can't seem to get anywhere. Any help will be greatly appreciated...

anyone know a value for the coefficient of friction of wood on rubber? rhys

If a rubber ball is fill with air, attached to a cord and pulled under water, I assumed it collapses under pressure at some rate. The question is, will it at some point lose enough bouyancy to sink to the bottom?

Homework Statement A 10 g rubber ball and a 10 g clay ball are thrown at a wall with equal speeds. The rubber ball bounces, the clay ball sticks. Which ball exerts a larger impulse on the wall? Homework Equations J (impulse) = Favg*dt The Attempt at a Solution I think that...

Hmm...some experimenting led to an interesting result. I attached a weight to a rubber band and suspended the rubber band in some hot water. The rubber band expanded. I repeated the experiment in cold water and the band shrank. An expected result, yes? Well I redid the experiment in air and I...

Hi, Not sure if I'm asking this in the right place, but I was wondering about the energy stored in a rubber band for a physics project I am working on. We all know that for a spring or rubber band being extended, the restoring force is given by F=-kx, and the energy stored U=0.5kx2. However...

Homework Statement You have a rubber cord of relaxed length x. It be- haves according to Hooke's law with a "spring con- stant" equal to k. You then stretch the cord so it has a new length equal to 2x. a) Show that a wave will propagate along the cord with speed...

[b]1. The problem: Suppose a rubber band obeys the equation of state: L = f (b/T), where L is length, f is tension, b is a constant, and T is temperature. For this rubber band, determine (δC[SUB]L/δL)[SUB]T, i.e. the change in the constant length heat capacity with length at constant...

Note: I refrained from using any of the latex references, so bear with me. Homework Statement A rubber ball with a radius of 3.2 cm rolls along the horizontal surface of a table with a constant linear speed v. When the ball rolls off the edge of the table, it falls 0.66 m to the floor below...

The bullet hits near the top of block. Which will tip the block over? Which will do most damage? I believe the rubber will tip it over and the metal will do the most damage...but I'm not sure how to explain it. When the metal hits it enters the block. When the rubber hits there is a...

Homework Statement Two rubber bands pulling on an object cause it to accelerate at 1.6 m/s2 (a) What will be the object's acceleration if it is pulled by six rubber bands? Answer: 4.8 m/s/s (correct) (b) What will be the acceleration of seven of these objects glued together if they are...

Do I understand this?-if I stretch a rubber band from a 1" length to a 2" length... If I stretch a rubber band from a 1" length to a 2" length, is it true that it was not all possible lengths between 1" and 2" sometime during the stretch? In other words, at some level, quantization enters in...

Hi, I want to know that which one is more elastic: steel or rubber. and why?

Homework Statement Okay, so I'm not originally an English speaker, so this may be silly reading for some of you, especially a lot of the words here, which isn't to find in the dictionaries either, but hopefully you'll at least get a picture of the task and help me solve it. The drag (air...

Hello all, im trying to find some data for the static COF for rubber on steel. I have been looking hard but can only find info for rubber on concrete and other non metals. I am doing the initial sums for a combat robot I am designing, but want to get the figures sorted out before i spend...

When the rubber sheet with the bowling ball in it stretches, the density of the rubber is lowered as the rubber molecules become more widely separated by empty space. Are there particles of space time(?) that are similarily separated by more empty space when when the amount of nearby mass(?)...

I'm struggling to understand how the stretched rubber & metal ball analogy explains the relativistic conception of gravity. It's possible that there is a simple and obvious solution to my confusion. It's also possible that this question has been answered many times. But I'll go ahead and ask...

This indicates that sense of body position is arrived at by input from sight, touch, and proprioception, and that, when the stimuli are inconsistent, sight and touch are "believed" by the brain over proprioception: http://www.sciencedaily.com/releases/2004/07/040702093052.htm...

Rubber is an insulator, so why does it make a spark upon friction with the floor? What would be a good material for shoe soles to avoid this problem?!

Homework Statement A rubber balloon has a charge q evenly distributed over its surface. It is put into a uniform electric field of 120 N/C. What is the charge inside the balloon? Homework Equations The Attempt at a Solution I thought that E inside would be 120 since before it is...

The typical rubber sheet bowling ball analogy to "explain" gravity visually in layman's terms always seems to be two space dimensions. Why don't we use one dimension of space and the other of time? Both are curved by mass and everybody takes Eucledean/Cartesian type flat graphs of, say, x and t...

I have a pair of gym shoes that I really like, but because I have had them for about a year their bottoms have hardened up. They don't have very much grip anymore, and I'm wondering if there is some way to soften up their rubber soles. Is there something that they could be soaked in that would...

Please forgive my ignorance on what may be simple topics for most of you. I'm just trying to get my head conceptually around a ball launching pet project I'm fiddling with. If you take a rubber (tennis) ball, say of 5 oz mass, and blast it with a sprung plate moving at 70 mph, will the ball...

Basic question - How does an rubber ink filler work? (I don't want answers like - there is a vacuum created thus ink fills space and thus... Thats not Physics) Extending discussion : Is it better to press the rubber then dip and then suck and remove. OR To dip then press and suck and remove?

Homework Statement A giant rubber band is going to launch you straight upwards. Upon launch your acceleration is 15 m/s^2 upwards. If your mass is 70 kg, find the force applied to you by the rubber bands. This is a copy word from word of the problem. Please be specific. I have a physics...

Homework Statement How would you define the ultimate tensile stress of rubber? Homework Equations If I had a force/extension graph of rubber, what point in the graph would show me the value of the ultimate tensile stress?? The Attempt at a Solution Is it the same thing as ultimate...

Homework Statement 2 equal mass balls (one red one blue) are dropped from the same height and rebound off the floor. the red ball rebounds to a higher position. which ball is subjected to the greater magnitude of impulse during its collision with the floor? a. it's impossible to tell...

How close is this to what is being meant here? Let's say you have a big rubber sheet that can continue to stretch and stretch at the same rate and that it remains flat. (Yes a 2D analogy to help envision a 3D thing). On that sheet are little cars that move over the sheet. These cars...

Suppose we have a rubber band of some elasticity k and of unstreched radius r0 (the band is always kept in the shape of a circle). What work is necessary to strech it to some larger radius r? How do we apply Hooke's law in this situation? Thanks

It's been a while since I've been in science class and I was wondering if this was theoretically possible. It's so specific because I'm writing a story using this scenario and now am wondering if it's completely unrealistic... What are your thoughts? Here's the question: Let's say you have a...

Dear friends, If a bear's attacked by a: 1) Rubber bullet. 2) a lead bullet. Which'll be more effective in order to knock the bear down.I want to know how it's related to momentum phenomenon?I do know that lead bullet'll hit the bear down.Plz. reply in terms of momentum.Thanks.

Is it possible to have many rubber bouncing balls (7?) and send it into orbit?

I have a project that I'm working on involving a rubber band powered vehicle. I have a pretty well developed design involving several methods of propulsion but my main concern is a trigger mechanism in which to release this source of power from the rubber bands. Im not sure whether to go...

Homework Statement What is the electric force between a glass ball with 3.5 µC of charge and a rubber ball with -5.0 µC of charge when they are separated by 5 cm? Homework Equations Colombs Law: F(electric)=K((q(1)*q(2))/r^2) K=8.99E9 The Attempt at a Solution This seems like a...

Homework Statement A rubber balloon is rubbed against a wall and then sticks to the wall. This is because 2. multiple choice a. the balloon and the wall exchange charges through contact b. electrons hop back and forth between the balloon and the wall c. the balloon induces an...

How come both spring and rubber band are elastic whereas spring are contracted and rubber bands are stretched? I understand that elasticity of an object depends on it ability to reform from deform. I also get that spring works b/c of normal force(too much contraction...right?-being the reason...

Rubber Band Car For Physics-- Any Help? I'm building a rubber band car for physics and need as much help as possible. I'm by myself this time because I chose (and regret it). But, so far I have found this much out: Stuff so far: *Records/CD's are good because of large Diameter *Heating...

2008 Stanford Innovation Tournament http://eweek.stanford.edu/2008/winners.html Clever and amusing.

A material that is able to self-repair even when it is sliced in two has been invented by French researchers. The as-yet-unnamed material - a form of artificial rubber - is made from vegetable oil and a component of urine. The substance, described in the journal Nature, produces surfaces...

Hello, newbie here. I am building a dual purpose (street/strip) twin-turbo 77 T/A. I plan to run a midplate between the bellhousing and the block which ties into the frame. The midplate will react the driveline torque to the frame instead of through the stock mounts, which bolt to the side...

A small rubber wheel is used to drive a large pottery wheel. The two wheels are mounted so that their circular edges touch. The small wheel has a radius of 2.0 cm and accelerates at the rate of 7.2 rad/s^2, and it is in contact with the pottery wheel (radius 21.0 cm) without slipping...

Hello Everyone. It has a year since I have worked with Elastic Potential Energy & I have forgotten the formula to work it out. I have this question and would appreciate it if anyone could tell me how to do it, or tell me the formula of how to work it out. So here it is: Rachel pulls...

Help me?? I need to find three different names for the constant between length and force in hooke's law. I also need to find out why, when rubber bands are stretched by force, at a certain force, they actually get shorter. can anyone help?

Just looking for a few idea for me to explore. Basically I have a lump of material that is little bits of stone and rubber stuck together that I need to separate. Any ideas welcome Thanks

Can anybody explain how the momentum is conserved in the case of a rubber ball (bounced back),when it was throwned to a wall?

Homework Statement http://www.feynmanlectures.info/exercises/bug_on_band.html An infinitely stretchable rubber band has one end nailed to a wall, while the other end is pulled away from the wall at the rate of 1 m/s; initially the band is 1 meter long. A bug on the rubber band, initially...

A famous Einstein quote: “Dadurch verlieren Zeit & Raum den letzter Rest von physikalischer Realität. ..." “Thereby time and space lose the last vestige of physical reality”. for an online source see page 43 of [PLAIN]www.tc.umn.edu/~janss011/pdf%20files/Besso-memo.pdf[/URL] This source...