Rubber Definition and 242 Threads

I was reading Michael Faraday's story, and it described him using amber, wool, and small pieces of paper to bring about an amber-paper attraction. I tried doing this using the rosin from my violin case, wool-like material I found in my parent's room, and cutting up pieces of paper (very finely)...

I was feeling very bored so I wanted to play with my surroundings and I had: Crafting glue: And Rubber Dust: Near me so I (for some reason) mixed them together and rubbed them on my hand. After some time it started to take a spherical shape. It lost the stickiness of glue and started acting...

I would like to know the purpose of the rubber in this water pump and a metal piece behind it in this water pump of a vehicle. The water pump is located in the engine near the distribution belt. Best Regards There are two version of the rubber : one with a hole or without it.

Hi all! Usually, one would model a rubber as incompressible (##\nu \rightarrow \infty## or equivalently ##\kappa \rightarrow \infty##, where ##\nu## is Poisson ratio and ##\kappa## is bulk compressibility). However, I am trying to use rubber in an application where performance will improve the...

I just baked a cake, and accidentally left a rubber band around the cake tin (which was holding the greaseproof paper in place). Is the cake inedible due to fumes given off by the rubber band?? Thanks :)

Suppose the car is moving to the right, so if the wheels roll without slipping, they are rolling clockwise. To get the wheel to slip, a counterclockwise torque would need to be applied to cause the wheel to have some angular acceleration. If the wheel was slipping, then the bottom of the wheel...

Hi Folks, I promise there is an actual question at the end of this note. I couldn't see where to attach images on this forum page, so here is a link to a rough illustration and a photo of the project site in progress (the cabinet for the digester is partially built)...

Is it possible to maintain an environment with low humidity to preserve electronic devices from oxidation without this low humidity drying out plastic and rubber from electronic devices and DVD discs that are plastic and in that environment? in my room I have two digital hygrometers and an air...

Hello there, I am wondering, in this solution, I guessed that the restoring force is given by that equation in the problem because the vertical component of the force acting on the ball is -2Tsin(x). since sin(x) = y/L with L being the hypotenuse part of the triangle formed by displacing the...

I have a PS2 Slim 90000 and its case is ABS plastic and it has rubber parts, this device is located on a wooden table, the lights with UV in my house and the sunlight coming into the house will dry out, crack and damage the ABS plastic and the rubber of this device? my house uses LED bulb

A 7.80 g bullet is initially moving at 500 m/s just before it penetrates a block of solid rubber to a depth of 4.50 cm. (a)What is the magnitude of the average frictional force (in N) that is exerted on the bullet while it is moving through the block of solid rubber? Use work and energy...

I have a question in regards to a neuromuscular device. Can silicone be combined with hydrogel or the rubber silicone encased in hydrogel to form a wrist watch strap combined with a NMES device. If this is possible how would the hydrogel conduct the NMES device and what is the durability of...

How did you find PF?: Via Google search. Hi everyone, I am an enthusiastic vintage wireless restorer/hobbyist attempting to preserve rare and unloved wireless sets from extinction. There seems no limit to the effort I will go to in attempting to faithfully reproduce missing parts in my...

I appreciate some helps with this question. I understand that soft noodles is not as strong as calamari squid and breaks easily . I also know that that calamari squid does not have elastic behaviour since behaves like rubber band and it goes back to it's original shape after reloading. But I'm...

How many kinds of rubber are there? And what does "Environment Friendly Rubber Material" mean? Hundreds of thousands of babies put these in their mouth and lick them continuously.

If you take a rubber band and fix it in a stretched position for an extended period of time, would it eventually lose its elasticity? If yes, then how can you calculate how long it would take until its elasticity decreases by a certain amount, say, fifty percent? If no, why not? How does the...

Hi everyone I think I might have cooked a rubber band that got stuck to the bottom of the bowl of my rice cooker. The rice didn't smell of fumes, and I ate it before noticing the burned bit on the bottom of the bowl. I'm not sure it's a rubber band, but it was very sticky and not crispy like...

UV causes dryness of plastic and rubber and lights have UV so keeping it in the dark away from light inside boxes prevents this but notice this photo where the box where the arrows are marked the clarity q enters this region of the closed box is enough for the long term the UV of this clarity...

Nota that the path a to b is isothermal since J is proportional to L, then we can find the value of T_a and T_b using the equation of state and the figure. We have, \begin{equation} J_0=\alpha L_0T_b \end{equation} or \begin{equation} T_b=T_a=\frac{J_0}{\alpha L_0}=T_0 \end{equation} Also, by...

Hello, I am having trouble applying Lagrangian to this problem: A uniform thin circular rubber band of mass ##M ## and spring constant k has an original radius ##R##. Now it is tossed into the air. Assume it remains circular when stabilized in air and rotates at angular speed ##\omega## about...

The rubber hammer is more elastic so the time of contact will increase. Ft=m(v-u) Does this mean it is more effective as less force is needed for the same change in momentum of the hammer (and the nail) so it requires less force from you? Or does it mean it is less effective as it imparts less...

Does a rubber mat on a device prevent static build up and discharge on a metal device well using it

why can't we use Cartesian coordinates and in which way to proceed?

Option (B) is wrong because energy should be received by rubber band when it is being stretched Option (D) is wrong because energy should be released by rubber band when it goes back to natural length The area between graph of stretching and contracting represents energy dissipated in rubber...

If I have a metal electric conducting ball the size of an average snowball (Happy Holidays) and give it a charge of say 0.1 Coulombs and set it on a wooden table, will it ever discharge if not touched by anything else? If so, if it is wrapped in an electrical insulator, will it ever discharge...

Hello, How can I calculate the force that must be exerted on a ball inside a rubber tube? Thanks

Maybe someone already did this experiment? We have rubber band stretched and attached to the fence of Marry Go Around. When Marry is not rotating we are oscillating rubber band vertically, and oscillation remains vertical. What would happen if we oscillate the rubber band vertically when Marry...

I have been assigned by my tutor to design a hydraulic guillotine (rubber bale cutter). After designing its features of the hydraulic, cutting blade etc. I tried to calculate the force needed of cutting a piece of Rubber bale (Natural as reference) having an ultimate tensile strength of 30 MPa...

My very beginner level understanding is that the rubber band's tension stems from it's particles being held together by it's electric bonds: Atoms and molecules are bound together by their electric charges. And so, When I stretch a rubber band, I am presumably pulling it's particles away from...

Summary: Looking of someone to double check my work on this design issue. I am posting this here because I am no longer a student, but it is similar to a simple homework problem Problem: I am designing a rubber-band like product for a client. He wants to take a durable rubber band and stretch...

I have never felt comfortable about trying to explain gravitational attraction to children by using heavy balls running around elastic rubber sheets. After all, it is using gravity to explain gravity. It would be so much better to explain it more like it really is, thanks to that originally...

Hi. An ant walks with 1 cm/s along a rubber rope with initial length 10 cm that is stretched uniformly with 10 cm/s. Find its velocity at time ##t##. This is a a well-known problem, but I'd like to know what's wrong with the following alternative approach: At time ##t>0##, any point ##x_0## on...

I started having this problem with wearing slippers (or any shoes with rubber soles) in the house because the rubber, rubs the carpet and charges me up. Anything metal that I touch gives me a mild-nasty shock depending on how charged up I am. I tried different kinds of slippers and socks, I...

Good day all, I tried to solve the following exercise, I would be glad to get feedback for my attempt ( indeed I was puzzled by the numerical solution I got just need to check it for any mistake: A copper wire , 2mm in diameter and 100 m in length has an electrical resistance of 0,5 mΩ/m, the...

Hello; I import karting tires from Taiwan , while reviewing a sample tire sent for inspection for our order, I noticed a change in spec. of Duro rating . We spec. them at 65-75D ,this sample came in at 60-65D ..here is the factory response= Hi Gus, The tire factory explained that the tire...

Is there anyway to stop rubber from bouncing? My class is doing an experiment on material absorption. I have been given the task to stop a rubber ball from bouncing. I was given a rubber ball that weighs 5 and a half ounces and has a circumference of 8 in. My material can't be over an inch...

Which bullet of same momentum is more effective in knocking a bear down? Lead bullet or rubber bullet?

Hello My name is ron and i am a mechanical engineering in pump factory. In some project i work on, i have fluent that contains sulfur (less then 10 %). my question is how natural rubber react with sulfur? and if its currect to use natural rubber? thanks

I have to make a part that clamps into the inside of the end of a scaffolding tube. I’m thinking of two disk of metal with a disk of rubber sandwiched between and when inside the tube you tighten the bolts pulling the two disks together and squeezing/expanding the rubber so it wedges it’s self...

Homework Statement Homework EquationsThe Attempt at a Solution I tried to find constant k f = k ##\Delta##x 1/2 * 9,8 = k * 0,1 k = 49 N/m is rubber string the same as spring? Ep + EK at 0,1 meter = Ek + EP at 0,3 m 1/2 k x^2 + 0 = 1/2 k x^2 + 1/2 mv^2 v^2 = 2*49(0,08) v = 7*0,4 = 2,8...

I have an odd question after making a rubber band car. I'm wondering if placement of my pairs of wheels has any affect on how fast or how far my car goes. It seems to be a very impractical design, but I do want to know the science behind it. My question is if I move two wheels all the way to...

Hello All, Very new to design , especially in material selection and rubber stuff. I have requirement where piston/shaft reciprocates to housing at high speeds. In order to reduce noise and for safety reasons, I must add rubber pads on both. Application as below: Red part is the...

Homework Statement Let's put a ball in an empty space with a mass of 280 kg and a radius of 6 meters. Imagine that there is a rubber band around this ball. The initial radial extent of the rubber band is 2 meters. How can I determine the force that stretches the rubber band? And can i say that...

I was reading this wikipedia article: https://en.wikipedia.org/wiki/Ant_on_a_rubber_rope In the analytic solution section, it says that, at time ##t##, a point at ##x=X##, i.e. initially at a distance ##X## from the starting fixed point on a uniformly expanding rope moves with a speed...

Homework Statement For a stretched rubber band, it is observed experimentally that the tension ##f## is proportional to the temperature ##T## if the length ##L## is held constant. Prove that: (b) adiabatic stretching of the band results in an increase in temperature; (c) the band will...

Hello gang! I am dealing with a new issue at work and I though you might give me some much useful insight. Im trying to fix a component to a plate and using 4 screws and rubber bushings to attach said plate to the firewall. The component is around 5-6 kgs and needs to held in place firmly but...

Cross posted this in the materials forum but i received nothing so I'm posting it here. << Mentor Note -- OP has been reminded not to cross-post at the PF >> So the application is in a pedal set for a racing simulator cockpit. The brake pedal has a high resolution pressure transducer that...

Used as a boat buffer.

Hi all, I am working on a rubber band plane (something like this: http://www.instructables.com/id/Rubber-Band-Powered-Aeroplane/) and I got a question regarding to the physics on these plane. As there is only one propeller and one rubber band, when the rubber band untwist, why doesn’t it rotate...

I was reading the Feynman lectures and in one of the chapters on thermodynamics it is stated that stretching a rubber band makes its temperature rise. I feel like I understand the thermodynamics of the rubber band and yet this statement is puzzling me. I believe that when you stretch a rubber...