Train Definition and 650 Threads

Homework Statement Imagine you are traveling in a train, and see in the distance how the train path splits into two parallel tracks separated by a distance d.1) Obtain an analytical expression of the de Broglie wavelength of the train. 2) What condition would you use to determine at what point...

A stunt car is driven along a flat train car. The stunt car is moving toward the engine of the train. How would you calculate the velocity of the stunt car relative to earth? Im in physics 11 and we are almost done our velocity chapter and this question was on our review.

I'm still having difficulty with the fully mathematical approach to GR (via metric and tensors), so I'm making thought experiments to get a feel for some issues. Let's have a train moving at relativistic speed on a flat planet (so that the train goes straight). Also the gravity is supposed to be...

Homework Statement .[/B] A model steam train engine has a mass of 2.3 kg is powered by a sterno and white gas mixture that heats a small boiler. Once sufficient steam pressure is produced, the train is released from rest. The train travels along a straight and level track. At any time after...

Hi all, I've been trying to find an answer to this question for a while, (bear with me physics is not a strong point). I would like to know how one would go about calculating how fast you have to throw a ball out of a train to negate its forward momentum. My understanding is that if you throw...

Homework Statement A train is at 0 m/s at the begining. It accelerates on a distance of 60 m, after it goes on a constant speed on the next 120 m and it finally decelerates on the next on 30 m and stops. The whole traject is 25 sec. Find the constant speed. Homework Equations x final = x...

Homework Statement A train is going towards a stationary car at a speed of 50 km/h. There is a distance of 250 m between the train and the car. What must be the acceleration (which is constant) of the train so that the train won't collide with the car ? Initial position of train = 0 final...

< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > I have a design problem that has two predictions that I must make. The constants that I am given is the amount of teeth each gear has, the diameter of the gears, the input torque, speed in...

Homework Statement Two trains run in opposite directions on parallel tracks. Train A is 30 meters long and runs east to west at 60 mph. Train B is 45 meters long and runs west to east. It takes 0.5 seconds for the trains to pass each other. How fast is train B travelling? What is the velocity...

Homework Statement A passenger train is traveling at 27 m/s when the engineer sees a freight train 366 m ahead of his train traveling in the same direction on the same track. The freight train is moving at a speed of 5.9 m/s. (a) If the reaction time of the engineer is 0.39 s, what is the...

Homework Statement a train travels between stations one and two (station one is marked by "A", and station two is marked by "D". There are also the other points "B" and "C") the engineer of the train is instructed to start from rest at station 1 and accelerate uniformly between points A and B...

With Dirac Comb is defined as follow: $$III(t)=\sum_{n=-\infty}^\infty\delta(t-nT)$$ Fourier Transform from t domain to frequency domain can be obtained by: $$F(f)=\int_{-\infty}^{\infty}f(t)\cdot e^{-i2\pi ft}dt$$ I wonder why directly apply the above equation does not work for the Dirac Comb...

We all know the experiment - here It says that for the observer on a train the lightning strike that we are traveling to happened first, but I have some questions. 1) We are moving towards right, so we must see the right lightning first. And we are moving away from left lightning so that...

Bravo Zulu! http://www.nbcnews.com/news/world/three-americans-hailed-heroes-stopping-train-attack-n414206 Don't forget the Briton. http://www.france24.com/en/20150822-france-train-attack-briton-chris-norman-thalys

Homework Statement the question exactly states that a 8000 kg pulls a train of 5 wagons each of 2000 kg along a horizontal path now if the train exerts a force of 40000 N , and the track offers a friction of then calculate a_NET FORCE b_ACCELERATION OF TRAIN c_FORCE OF WAGON 1 ON WAGON 2 2...

Dear PF forum, I have a problem with Train experiment. Perhaps someone can take a look at it and tell me where did I go wrong? V = 0.6c; Gamma = 1.25 Train length = 1500 Platform length = 1200, so the light can reach the observer at the same time. I draw the space diagram for that problem...

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...

Assume there is an engineer who built a tunnel, tunnel length is 10m, and we have a train its length is also 10m...so the tunnel can encompasses the entire length of the train. But if we assume that train is a light express train, it always comes through the tunnel at relativistic speed, let's...

Homework Statement a) Determine the input power required at shaft 1. b) Specify the efficiency of the gear train as a percentage. c) Determine an equation for the efficiency of the gear train in terms of the load (torque) on shaft 2 (all other factors remaining constant). Knows: 4 gear train...

[ A train starting from rest accelerate at the rate of 6m/s² for 20 seconds to attain a constant speed and it traveled for another 20 seconds and decelerate at the rate of 3m/s² for 20 seconds. Calculate the total distance (in kilometer) traveled by the train. That's the question. I found it...

Can anyone tell me what is the air resistance on the top of a bullet train when it is moving at top speed

Hi everyone, I am an aspiring writer, and I have come here seeking some insight/a second opinion. I recently decided to work on my one novel, a science fiction story, and unlike some other sci-fi writers, I want to make my book as scientifically plausible as I can, without relying on something...

Calculating the input power required for a drive gear in a train. I have 4 gears, all in line. The driver shaft A rotates at 100 revs/min and the gear has a diameter of 40mm. 20 teeth with a module of 2mm The output is to rotate at 400 revs/min and has a diameter of 160mm with 80 teeth and...

I was reading a closed thread here about the length contraction being real or not. The best I could understand my self is that space is the one that contracts, the final post by an experienced forum member saying something like its the space-time that changes, it rotates. But I still have to...

I am standing in the middle of a train. There are two lightsources attached to the train. One in the front, and one in the back. Both aimed at me, both with the same distance from my position in the train. No matter how fast the train is moving, i will always stay equally distanced to them. The...

Homework Statement A train wagon of mass M moves on a rail with constant velocity V (without friction). It passes a sand hopper which pours sand in the wagon at constant rate C [kg/s]. The sand falls vertically so it does not transfer any horizontal momentum to the wagon. The length of the...

Homework Statement The engineer of a passenger train traveling at vP sights a freight train whose caboose is distance D ahead on the same track. The freight train is traveling at vF in the same direction as the passenger train. The engineer of the passenger train immediately applies the brakes...

I'm a 10th grade student and I'm very interested in railway engineering. Especially railway vehicle engineering. What are the requirements for that kind of profession?

Question: A streetcar is freely coasting (no friction) around a large circular track. It is then switched to a small circular track. When coasting on the smaller circle its speed is: a) greater b) less c) unchanged Relevant Formulas: w = v/r KE = 1/2mv2 My teacher said the normal force from...

I am a student, and a few days ago in physics class we were discussing about the 'bullet fired from a train scenario', where e.g. if a train is heading towards a certain direction at 200 km/h and a bullet is fired at 800 km/h, the bullet would travel at 1000 km/h relative to the ground. However...

if we fly over a moving train at the speed of train can we out run it?? it not, how come we fly at 255m/s when Earth is rotating at 460m/s and we reach from paris to america

1. The problem statement, all variables and given/known A train of mass M is moving at uniform velocity v, being pulled by a locomotive with power P. A single cart of mass m gets detached. How far will it go before coming to stop? M, v, P and m are known. The attempt at a solution I know I'll...

Im doing a prac for school that we have to create ourselves. My groups prac goes along the line of a train pulling two carriages. Our train is a LEGO NXT unit that runs at a constant velocity, no acceleration. We will have two force gauges between each carriage and the carriage and the train and...

While on a long distance train in India I noticed that there were two huge cars devoted to power generation, one at each end of the train (approx. an 18 car consist). A pic. below. Apparently diesel powered generators. Each car had two exhaust pipes on top (one at each end) so presumably these...

Homework Statement Suppose that you are standing on a train accelerating at 0.16g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?Homework Equations F=ma The Attempt at a Solution

Homework Statement A bob of mass m is suspended from the ceiling of a train moving with an acceleration g/√3 (a) If an observer is sitting inside the train, what angle with the vertical will he observe? (b) If an observer is standing on the platform, what angle will he observe? Homework...

Ok so the question is a freight car moves along a frictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the car? And I asked my teacher if the coal dumped in was stationary relative to...

Can someone briefly describe to me how this works? I am making my own for a physics project and have to do a report with it. What is this an application of / What should I go over in the report, I originally found this when doing a project on Maglev trains but i don't know if it is a similar...

Homework Statement I'm on the very last section of a question for the design of a simple gear train. I've managed to design the gear train with all criteria fulfilled and I am confident that it is correct. I just need clarification that my calculations thus far are correct and also a fresh...

Homework Statement What is the coefficient of friction between the train and the track, given that the train has 20,000 kg and is going at velocity of 26m/s. Note that when the train conductor saw a pedestrian he started braking and also the distance between the pedestrian to the train is 500m...

In the moving frame, relative to the stationary frame, if time is slowed and the speed of light isn't, why doesn't the light travel further in less elapsed time?

Homework Statement A train at latitude λ in the northern hemisphere is moving due north with a speed v along a straight and level track. Which rail experiences the larger vertical force? Show that the ratio R of the vertical forces on the rails is given approximately by: R= 1+ 8Ωvh sin λ / ga...

I think it may have something to do with momentum or vectors, but I'm not sure? Can you explain to me why Wolverine jumping off the train and then flying several feet backwards in a perfect straight line is unrealistic?

Who first came up with the light clock on a train thought experiment.

Homework Statement The velocity of a tram traveling on a straight line between two stops is given by: v = 16sin(pi(t)/30) m/s find the time lapse between stops the distance traveled between stops the maximum velocity of the tram and when it occurs Homework Equations Displacement = x...

Youre on a train going the speed of light and you look into a mirror and can see your reflection. Which means that light is reflecting off your face and to the mirror. But to do this the light bouncing off your face would have to be going twice the speed of light to an outside observer. Which...

Homework Statement Train A travels with the velocity v= 30m/s, suddenly the driver sees another train ahead, Train B which travels with the velocity v=10m/s. Immediately Train A's driver starts the brakes ( a=1m/s²) while Train B still travels with its velocity. The moment A starts the brakes...

Homework Statement A train pulls away from a station with a constant acceleration of 0.4 m/s2. A passenger arrives at a point next to the track 6 s after the end of the train has passed the very same point. What is the slowest constant speed at which she can run and still catch the train...

Homework Statement A locomotive accelerates a 34-car train along a level track. Every car has a mass of 6.2 × 104 kg and is subject to a frictional force f = 165v, where the speed v is in meters per second and the force f is in Newtons. At the instant when the speed of the train is 31 km/h, the...

Never mind the title. It could be New York City to Newark. The idea is thus: Permanent Magnet Rail - Train Now imagine a train running on rails, and permanent magnets arranged on the side of the train, suitably arranged so as to cause forward motion of the train? I am not familiar with...