Track Definition and 329 Threads

It's finally here! (Over) Post your experiences and track the results here. I live in a small town near Philadelphia, PA and the line at the poll a few minutes after it opened was a good 50yds/100 people long outside the building. That would probably take an hr to get through, so I left...

Homework Statement Forgive me as I am trying the recall this question by memory. A racecar track is a perfect circle and 3000m long (I took this to be the distance traveled by cars, so the circumference) and after a day of time trials it is determined that the fastest possible time of...

Hello everyone! So within my major I can choose from various specializations, but I'm not sure what one would carry me the farthest in my career. I was wondering if I could get some advice on what I could do with these specific tracks before I make the final decision on which one to study. They...

Hi. I have issue of continuous failure of Track roller because of excess loading. I am looking for bush bearing with bearing pressure with 150 to 200 MPa @ 0.144 m/sec sliding speed & Friction coefficient shall be max 0.1. I will install a sleeve on the bush bearing & use it as a roller . Can...

Homework Statement The diagram shows a section of a curtain track in a vertical plane. The curved section, CDE, forms a circular arc of radius of curvature 0.75 m and the point D is 0.25 m higher than B. A ball-bearing of mass 0.060 kg is released from A, which is 0.50 m higher than B. Assume...

Academically, I look like I slacked off sophomore year at UIUC. On the other hand, living in a really bad situation and losing focus during that year can do a number on you, but it's my fault I let it affect me. Here's where we are, everyone. Over the course of a year, I have gone from having a...

Homework Statement A student runs an experiment with two carts on a low-friction track. As measured in the Earth reference frame, cart 1 (m = 0.48 kg ) moves from left to right at 1.0 m/s as the student walks along next to it at the same velocity. Let the +x direction be to the right. A. What...

Homework Statement A car has an initial speed v0= 20m/s. It increases its speed along the circular track at s=0, at=(0.9s) m/(s2), where s is in meters. Determine the time needed for the car to travel 35m. The radius of curvature of the track is 40m. Homework Equations an = v^2/p a = dv/dtThe...

Hi all, I graduated from university with a BSc in Physics (3rd class) in 2000. I was having some issues with depression then in my university years but I managed to graduate with a B average in my basic degree. In 2005, I was warded in a psychiatric hospital and diagnosed with schizophrenia. I...

I was reading about track reconstruction. So, I read about the "inside-out" and "outside-in" strategy for track reco. However both those strategies utilize information coming from the InDet parts... I know though, that the Muon Chambers are also used for the track reconstruction in ATLAS. How is...

Homework Statement He is running around a running track training for a 400m race. His velocity is 5.11m/s around the circular end of the track, which has a radius of 31.8m. I'm trying to find his acceleration which I know is 0.821ms-2 but I can't find out how to get it. Homework Equations v=rω...

Hi All, I was wondering how I would go about creating a circular maglev track using electromagnets? The idea is to have more control over it and to eventually write a piece of code that would allow changes in the strength of the magnetic field potentially? I was just wondering how it would work...

Homework Statement A boy slides on a sled on the curved track sketched (black line). (Treat the boy and sled as a particle.) His mass plus that of the sled is m = 41 kg. Friction and air resistance are negligible (I want a sled like that!). His initial speed is v0 = 1.3 m.s–1. The height h =...

Homework Statement Homework Equations H(s)= Vo / Vi Ideal op amp: V+ = V- Vo = V- The Attempt at a Solution To simplify the circuit, I noticed that the 200 ohm resistor and 60 microFarad capacitor are in parallel so: Zp = (R/sC) / [(1+sRC)/(sC)] = R / [(1+sRC)] Seeing that the Zp is in...

I recorded an amazing cloud chamber track tonight. It came from the direction of the sun, seemed like the angle was off slightly though. I was at 1200ft above sea level and it was 6 pm. I will attach a picture of my setup and a video that is typical and then the video with the awesome track. It...

Hi, I'm trying to implement an auto track guidance system for ground vehicles (Eg Tractors), I'm using Matlab and Simulink. I'm at a point where I can calculate heading errors. I'm not too sure how to calculate the lateral errors. Also, I need help in designing the controller. I'm using...

Hi I was wondering if someone could help with creating a track map using lateral accel and speed. More specifically the steps to the maths needed to plot the coordinates. I know how to find the curvature radius but not sure what the next step is. Thanks

I'd like to discuss the question in the title, following up on my remark quoted below. Note that I don't want to repeat the discussion in https://www.physicsforums.com/threads/tracks-in-particle-detectors-and-quantum-paths.758778 so maybe reread that one first! The traditional analysis is...

Hi, I've a question that is baffling me a little. If a train was made so that it would act as a moving track / roadway and the cars were connected so as to complete a length of the track, in an oval for example. Say we accelerate the moving trackway to 100 Mph, and then a car accelerates to...

I need to make a time keeping apparatus that doesn't require electricity. It needs to be something I can make at home and can obtain the resources from a local department store(menards or Home Depot etc.). Any suggestions?

Homework Statement Consider a frictionless track as shown (I will attach an image in a follow up post). A block of mass M1= 5.00 kg is released from point A. It makes a head-on elastic collision at B with a block of mass m2 = 10 kg that is initially at rest. Calculate the maximum height to...

Homework Statement A roller coaster is going down on a track (see image below, the track itself is highlighted in red) without initial velocity. What is the coefficient of friction between the roller coaster and the track? height at which the cart starts (h) = 12m weight of the car (m) = 620kg...

This is a simulation and some of the crashes are really epic!

If a car us on a frictionless banked track what causes the normal reaction force to be greater than the weight force? My understanding from what I've read is that the vertical component of the reaction force cancels the weight force which makes sense as the object doesn't leave the ground. And...

Homework Statement [/B] Chris runs round a track at a speed of 6 km/hour. Dave runs round the same track in a speed of 9 km/hour. When Chris has run 18 laps, how many laps has Dave run? 2. The attempt at a solution Dave runs 1.5 times faster. So Dave will run 18 laps x 1.5 = 27 laps in the...

Why does star luminosity change while on Henyey track? A lecture: https://astro.uni-bonn.de/~astolte/StarFormation/Lecture2012_PMS.pdf Page 31 claims that luminosity changes as 4/5 power of temperature. I´m not even asking for derivation as to why the power is specifically 4/5, which presumably...

Homework Statement A toy car coasts along the curved track shown. The car has initial speed VA when it is at point A at the top of the track, and the car leaves the track at point B with speed VB at an angle θ above the horizontal. Assume that energy loss due to friction is negligible...

please explain why? Take 2 cases,and explain how is the direction of friction different in these 2 cases. CASE 1:uniform circular motion CASE 2:non uniform circular motion my thought was,friction opposes relative motion,so it must be tangential to the particle at each and every point. i very...

Hi all, I'm a researcher at a university and I got an important project with a company. For the first time in my professional life I need to cooperate both with a PhD student and an industrial partner and I should mostly coordinate the project. I want to perform well and to do this, I think I...

Or why don't they? All the mystique around them I would have thought even amateur's would do it for fun. What/why are they still a mystery? Or am I missing something?

Homework Statement This isn't a problem from a textbook or homework but just a general question. Say there's a car traveling in a circle and that the track has some coefficient of kinetic friction µ. What would make the car skid? Homework EquationsThe Attempt at a Solution I'm thinking that...

Homework Statement Three masses as shown below are resting on a horizontal, frictionless surface. The blocks are connected by massless, frictionless ropes. A force F of 60 N acts on the system as shown. Find the tensions in each of the other two ropes. m1= 10kg, m2 = 20 kg and m3 = 30 kg...

Homework Statement A block of mass M=2kg with a semicircular track of radius R=1.1m rests on a horizontal frictionless surface.A uniform cylinder of radius r=10cm and mass m=1kg is released from rest from the top most point .The cylinder slips on the semicircular frictionless track.The...

What if we built an electromagnetic track around the circumference of the moon? We could then accelerate a spacecraft to a very high speed. In theory it would only be limited by the strength of the materials holding the craft to the track and the centripetal acceleration that the craft/people...

Homework Statement a motor traveling at a constant speed is just able to completely go round a vertical circular track of radius 8m The total mass of motor is 210kg i)Compute the angular velocity at the top of the track ii)compute the maximum force on the track Homework EquationsThe Attempt...

From what I can recall the shape of tracks of particle accelerator is circular. Is it possible to change this circular shape in future particle acclerators, to shapes like some knots (with more than one crossing)? to gain more distance in less space, I don't know how construct it, but it's a...

I have a Asphalt Super that has a 3 link rear suspension with coil overs. I run a flat 1/2 mile track and no matter what I do to it I can't get aggressive on exit. We are very fast and winning races but when I pick up throttle I have to roll it to a mat or it will blow the rear tires off. Entry...

I have a project I'm working on where I need to have a model train be able to have an electromagnet hold its wheels to the track -- so that it can go "upsides down" and resist derailment. I'm making the wheels and the track -- so all options are on the table. If I used a steel track (say...

China is embarking on developing high speed railways that use wireless transmission of power, thus reducing the need to replace the sliding electrode which needs frequent replacement. The project is aware of the health & safety issue, of course. It also implies that they have already come to the...

Hi guys, My logic is obviously flawed here I'm just not sure what I'm missing. I'd love a hint but don't tell me too much as I want to try to figure this out once I'm heading in the right direction :) I'm really upset with myself that I couldn't solve this, so I'd love more SHM problems to...

Hello, I have a cart going down an air track with an inclination of 7 ° and for some reason my acceleration is going on a downward trend, my velocity is increasing and naturally so is the time. to find velocity I'm using v = (2x)/t and for acceleration I'm using a = (2x) / (t^2). Can you tell mr...

Homework Statement In a classroom demonstration, a glider moves along an inclined track with constant acceleration. It is projected from the low end of the track with an initial velocity. After 8.2 s have elapsed, it is 103.3 cm from the low end and is moving along the track at a velocity of...

1st tope, in my sci-fi universe let's say there is a warp drive that can power a ship that can travel 10*c. One of the first things I have people doing is coming up what is called "The Big Picture Project" which is installing this drive onto probes and sending them out unmanned and have it so...

I'm going to enter graduate school in August and I read in an article title something like "Some number of things I wish I knew before going into grad school" that having a way to keep track of all the papers you've read is endlessly valuable. Incidently I lost the article and don't know the way...

Homework Statement A block of mass m = 1.5 kg is launched from point A with speed VA = 12 m / s, in the circuit shown in Figure 4. If we assume that there is no friction determine: a) the speed of the block when it reaches the point C; Drawing of the problem: http://i.imgur.com/TrcMJ5I.png...

At time t=0 s a 0.362-kg air track glider is moving rightward at 5.1 m/s. At t=2.5 s, it's going leftward at 5.4 m/s. Determine the magnitude and direction of the constant force that acted on the glider during this interval. Give your answer in Newtons. If the force is going rightward, your...

I don't know if many of you have snapchat, but it's basically an app for taking pictures and sending them to others. Something you can do is add a filter that shows what speed your phone was going while the picture was taken.. How is this done? Or, more generally, how do things like running apps...

Hi All, New to the forum. I am a lineman by trade so I have an understanding of physics as it applies to not getting yourself killed when setting telephone poles and line tension. I am also a short track inline roller speed skater and they just announced that they will be allowing 125 mm...

Hello everyone, A university has two positions open: one is tenure track and the other is full time year-to-year. I am definitely fit for both, but I probably have a higher chance getting the full time (non-tenure track). Should I apply for both or it is better to just apply for the one I have...

Hello everybody, 1st post (please don't bite :P) I am a freshman student from California and I have an interest in engineering, and hopefully I will major in either biomedical, computer, electrical, industrial, or mechanical engineering. I understand that I have little to no experience and have...