Train Definition and 650 Threads

Say you are riding in a windowless train that is either stationary or moving at a constant velocity with respect to earth. How can u determine whether you are moving or not? I cannot think of a way since u would feel anything unless the train accelerates right? Thanks to whoever reply :rolleyes:

Hello, Please help me to find out the answer for the following question...! When a train is running, wheels at both sides are rotating with a same speed . So when it runs through a curve, the inner rail is having a small curvature than the outer rail. So Outer wheel has to travel a long...

Hi everyone. I have a question that my friends and I have debated for several years. I think I'm right and everyone else is wrong... Let's say I was in a train. This train is moving forward at a constant speed, maybe 200 mph. The ceiling is very high and there are no windows, doors, or...

How do you calculate the mechanical advantage of a 3 gear train system. The formula I have for gears is only for 2 gears: MA = number of teeth in the driving gear/number of teeth in the other gear.

I am working on a project of maglev train and want to build its physical model(as simple as it works) just to give an idea that this project is in working condition and also some mathematical modeling that will help me in my research paper So please if anyone can help me in this project I will...

Mmmm if it's not too much of a problem could someone help me with the following question?: A late passenger sprinting at 8.0m/s is 30.0m away from the rear end of a train when it starts out of the station with an acceleration of 1.0m/s^2. Can the passenger catch the train if the platform is...

The very desciption of Space-Time being only Relative Concepts is not what Einstein proported. He thought about calling it the opposite - "invariance theory." It ought to be known that relatives owe their existence to absolutes. They coexist. You don't want disagreement mentors? Then...

A toy train track is mounted on a large wheel that is free to turn with negligible friction about a vertical axis as shown in the figure above. The mass of the wheel plus track is 3.59 kg and the radius is 1.79 m. Ignore the mass of the spokes and hub. A toy train of mass 0.203 kg is placed on...

I'm trying to calculate the top speed of a train and I think I'm almost there but I've hit a wall. I started off by using the equation found at the link below and solved it for V (velocity). D=.5*PV^2ACd http://en.wikipedia.org/wiki/Drag_equation That gives me V=SQRT((2D)/(PACd))...

q,1: the hero of a western movie listens for an oncoming train by putting his ear to the trck. why does this method give an early warning of the approach of a train? a: My thaught are that any object that vibrates causes sound waves (due to compression waves in air..which are sound waves). so...

A train that had a mass of 18200 kg was powered across a level track by a jet engine that produced a thrust of 521000N for a distance of 444m. Find the work done on the train. I thought this was pretty straightforward; however, it's apparently not. I used W=Fd, but I got the wrong...

Lets say that I'm on a trian moving a velocity of 100 mph, and I release a ball with a velocity of 80 mph in the same direction the train is moving. The ball would appear to move at a velocity of 180 mph to someone on the ground right? Well what would happen if I shoot a beam of light. The...

Let T1 be the pull on the last car of the train I tried to solve this problem by calculate the acceleration first. I used this equation F=ma a=F/M = (1000N)/(6000kg+850kg+1700kg) And then I used T1-f = ma T 1-680n = 850kg x a from the above answer But I didn't get the answer. Can anyone...

So, I searched and found one almost identical to this, but no direction towards solution was posted, and I couldn't make sense of the formula in the original post. So... A red train traveling at 72km/h and a green train traveling at 144km/h are headed toward one another along a straight level...

hey could someone tell me how to start this problem? i don't know which formula I'm suppose to use.. A 90 m long train begins uniform acceleration from rest. The front of the train has a speed of 19 m/s when it passes a railway worker who is standing 190 m from where the front of the train...

dont know how else to word the title but here's the problem: you are in a train traveling on a straight and flat track (just assume its going right to left for my explanation) at 3.0 m/s. your window is 0.9 m high by 2.0 m wide and as you look out, the wall is going up at a 12 degree slope...

Einstein wrote about a long train that experienced bolts of lighting hitting on both ends. Einstein tells us that a midway observer on the ground would see both bolts at the same time, but the midway observer on the train would have moved off from the same ground point because of the time it...

A rocket-driven sled running on a straight level track is used to investigate the physiological effects of large acceleration on humans. One such sled can attain a speed of 1000 miles/hr in 1.8 sec starting from rest. (a) Assume the acceleration is constant and compare it t o g . (b) What is the...

Two trains, one traveling at 60 miles/hr and the other at 80 miles/hr, are headed toward one another on a straight level track. When they are 2.0 miles apart, both engineers simultaneously see the other's train and apply their brakes. If the brakes decelerate each train at the rate of 3.0...

I'm stuck... help someone! here is the problem: Two trains are traveling on the same track. One is going West at 25 km/h and the other is going East at 30 km/h. When they are 100 km apart an eagle takes off from the first train and flies at 50 km/h towards the other train. On reaching the...

A train moving at an essentially constant speed of 60 miles/hr moves eastward for 40 min, then in a direction 45 degrees east of north for 20 min, and finally westward for 50 min. What is the average velocity of the train during this run? So average velocity is \frac{\Delta r}{\Delta t} . I...

hmmmmmmmmmmm consider u r driving a train. there is 100 passengers in the train. at first station 50 more get into the train. 2nd station 27 more come in. but at the third station 45 left the train. 4th station no one leave or enter... 5th station 37 ins and 49 out. what is the name of...

Hi i was wondering if you guys could help me out on this i think i know the result but i would like to see if your guys agree. heres the situation: A cannon is positioned vertical on top of a moving train, the cannon shoots the ball straight up in the air. Where does the ball land, behind...

A train is traveling down a straight track at 20m/s when the engineer applies the brakes,resulting in an acceleration of -1.0m/s^2 as long as the train is in motion. How far does the train move during 40-s time interval starting at the instant the brakes are applied? After 40s, displacement...

I am an amateur and I have a question about time and relativity. It is my understanding that Einstein theorized that time slows down for a moving object based on his thought experiment of an individual shining a light in the forward direction on a moving train. Since the speed of light is...

Hi, Question: A train locomotive is putting two cars of the same mass behind it. Determine the ratio of the tension in the coupling between the locomotive and the first car(FT1) to that between the first car and the second car (FT2), for any nonzero acceleration of the train. Work: F=ma...

I have recently completed my mid-year chemistry exam and came across a question that i cannot find an answer to. Me and my friends completely disagree and i was wondering if anyone could help me? -The question showed a simplified diagram of a train around a circular section of a track, and the...

Hi, Can someone help me out on this one ... A train is driving from one point to another at a constant speed. In the gangway of this closed train we let a RC-helicopter take off from the ground. What will happen with the helicopter, will he stay in the air near us or will he crash...

I am working on a computer program that determines the minimum time it will take for a subway train to go from one station to the next based on a few parameters: The parameters to the problem are all positive integers not greater than 1000. * d - the distance between stations, in...

I am doing a project for my physics course...I have to design a device that uses electromagnetism. I'm thinking of doing something "different" rather than the boring bells/radios etc.. Would a small-scale model of a maglev train be feasible in everyone's opinion? I am planning to build a...

How do you calculate Gear Train Radios? Thanks

This is not original with me, and might be on the web somewhere, but I like it a lot: Two trains travel nose to nose at the same speed along adjacent parallel gradeless tracks. The trains are identical in construction, maintainance, cargo distribution, fuel load, etc. When they approach the...

Anyone here, besides me, who railfans and/or models trains. My college friends thought I was loony chasing trains. :biggrin: But I had a lot of fun. :smile: My grandfather (mom's dad) worked on the railroad (Victorian Railways), and on occasional weekends and during holidays, my brother...

train and spring problem problem: At the train station, you notice a large horizontal spring at the end of the track where the train comes in. This is a safety device to stop the train so that it will not go plowing through the station if the engineer misjudges the stopping distance. While...

I have seen this recent photo of a twisted meteor train http://antwrp.gsfc.nasa.gov/apod/ap050202.html As the image shows, the meteor followed an spiral path, I couldn't imagine that such thing was possible. Does somebody here take photos of meteors? Ever photographed a twisting path?

Hi there, I need to build a Maglev= (Magnetic levitation) train for a science project. I already build a track with coils and permanent magnets, but unfortunately my teacher doesn't know which computer program is suitable to switch the current whenever it's needed along with the north and...

A commuter train can minimize the time t between two stations by accelerating (a1 = .20 m/s^2) for a time t1, then undergoing a negative acceleration (a2 = -.5 m/s^2) by using his brakes for a time t2. Since the stations are .90 km apart, the train never reaches its maximum velocity. Find the...

PROBLEM: A train with a total mass 2.20E+6kg rises 600m as it travels a distance of 53.0km along a steady slope at a constant speed of 10.0km/hr. The frictional force on the train is 1.400 percent of the weight. Find the kinetic energy of the train. I did this using K=.5*m*vsquared and got...

Using speical relativity a train is moving along a track is v = (3/5) c. At the instant the train passes a construction worker standing right besides the track both the worker and the train driver set their watches to read the same time. A bridge collapses 200m furhter up ahead the track 2.0...

Greetings, I'm a physics newbie with a simple (?) question. If it's free-floating, where does the energy come from to power the lights, controls, etc. inside a moving maglev train? Another related question, if data needs to be transmitted to a moving maglev train, can it be done through...

Hi all, I was wondering if someone could help me out on this (taken from Newtonian Mechanics, A.P. French, pg 705, problem14-23) A wheel of uniform thickness , of mass 10kg and radius 10cm is driven by a motor through a belt. The drive wheel on the motor is 2cm in radius. The motor is...

This should be a simple question for this Forum: Einstein tells us that when the train is moving and the lightning flashes on both ends of the train,if it meets at the center of the tracks, it will not meet at the center of the train for the obvious reason that the train has moved off from that...

In the following the observer at the M' locations does not know if she is moving or stationary. All data is available for analysis one week after it is acquired. 1). A__________________M_____M'_____________B Light sources at A and B emit photons simultaneously both directed to...

A train pulls away from a station with a constant acceleration of 0.21 m/s2. A passenger arrives at the track 6.0 s after the end of the train passed the very same point. What is the slowest constant speed at which she can run and catch the train? Xtrain=Xo+Vot+1/2(a*t^2) Xtrain=3.78m +...

Good, cause you know the saying: "What's yours, won't pass you by!"

Hey! I am trying to get a rough estimate for the B-field (from a electromagnet) required to levitate a train. Assuming the train is of mass M, the force required to lift it and hold it at a distance D would have to equal M x g right? But how do i estimate the b-field an electromagnet...

In the 1950s, an experimental train that had a mass of 2.5 x 10^4kg was powered across level track by a jet engine that produced a thrust of 5 x 10^5N for a distance of 500m. a) find the work done on the train. b) find the change in kinetic energy. c) find the final kinetic energy of the...

My friend was in a ponderous mood and asked me the following question: If a train is traveling at 40mph and you are inside the train and running 10mph in the same direction as the train is travelling, what speed are you moving at? The answer i gave him was that 1/ The overall system is...

A Physics 111 student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 12 m/s. The student throws a ball into the air on a trajectory that she observes to make an initial angle of 53° with respect to the horizontal along the same line as the...

The normalization of the free (say, electron) in quantum mechanics is achieved by a trick with the dirac delta function. Typically we write the orthogonality conditions for u1=c*exp(i*k1*x) and u2=c*exp(i*k2*x) as: int(u1*u2)=delta(k1-k2) and then out pops the nomalization constant...