Train Definition and 650 Threads

Could someone please explain how crude oil could explode as shown in the recent crash in Canada. see: http://www.stuff.co.nz/world/americas/8943438/Insufficient-brakes-led-to-runaway-train

Hi! An attempted explanation for the tragedy of Lac-Megantic is that the only running locomotive was shut down by the fire brigade when extinguishing it, and as this locomotive stopped to provide pressurized air to the train, the wagon's brakes opened and the train ran away. Which I can't...

I saw a freight train cruising by today and thought "The momentum of that thing must be mind-blowing". I only have high school physics and thus couldn't calculate the momentum including many external forces. Did some quick research and was wondering what the momentum of an 80 car freight train...

I'm having a lot of trouble wrapping my mind around this... It seems there are some similar questions in this forum, but I can't tell if the answers can apply to my question... I'm sorry if this is an extra post: I am traveling in a vacuum, on a train, at the speed of light, from planet A to...

Does the gear train in a classic weight driven clock see a torque decrease when we lengthen the pendulum? thanks guys for your help - (inventor question)

Homework Statement A railway locomotive pushed a stationary wagon to accelerate it to a speed of 4.00 m s-1. The engine then applies an equivalent force over the same time on a second wagon to accelerate it from rest to a speed of 6.00 ms-1. The second wagon rolls down the track, collides with...

Homework Statement A train consists of a locomotive and five identical carriages, connected via massless ropes. Initially the train is moving at a speed V. At this speed, the tension in the rope, F between the locomotive and the first carriage exactly balances the resistive drag, so the train...

A train applies steel wheels to a steel track. Therefore, without any distortion of the wheel or track, the contact patch would be extremely small. Now, if you slice a chord from the wheel, creating a flat spot contacting the track, the result is a larger contact patch. With a larger...

Homework Statement A piecewise-continuous function models the velocity of a train (fps) as follows: $$ v(t) = \begin{cases} 80, & \text{if }\text{t>15} \\ bt+ct^2+dt^3, & \text{if }t\text{ <15} \end{cases} $$ How much time does it take the train to travel 5280 ft?Homework Equations $$(1)...

I have a circuit-diagram for a train which in the final stages converts the power to a 3-phase AC voltage (IGBT) that is the excitation for the motors in the train. However, right before the converter module there is a power inductor. I have looked through some literature and on the internet but...

Homework Statement A locomotive (6.4 × 10^5 kg) is used to pull two railway cars (Figure 11). Railway car 1 (5.0 × 10^5 kg) is attached to railway car 2 (3.6 × 10^ kg) by a locking mechanism. A railway engineer tests the mechanism and estimates that it can only withstand 2.0 × 10^5 N of...

A subway trains starts from station A with a uniform acceleration of .5m/s and attains full speed after 50 seconds. It travels at full speed for 120 seconds then is brought to rest at station by by the application of brakes which provides a acceleration of -2.50. Find the distance between A...

Homework Statement A train with proper length of 200m is traveling at the speed of 120km/hr. An observer on the ground sees two lightning striking the two ends of the train at exactly the same time. What the time interval of the lightning strikes observed by the observer on the train? The...

Lets say its the future your camera has an insanely fast shutter speed. You're standing on the ground watching a train travel past at just under the speed of light and the train driver is shining a laser pointer out the front window. With your insanely fast reflexes you take a take a picture of...

Homework Statement The problem and its solution are attached. Homework Equations N/A The Attempt at a Solution I'm very confused about how output pulse trains work. I already checked online (including Wikipedia) so, could someone please give me an explanation of the absolute basics in...

Hello 1 km long train traveling on a straight track at a constant speed V of 90 percent of the speed of light. At some point in the ground near the track there is a flashlight, when the last wagon passes the flashlight, a beam is sent to the engine. on the engine there is a facility that...

1. Homework Statement A train has a mass of 5.77E+6 kg and is moving at 99.4 km/hr. The engineer applies the brakes, which results in a net backward force of 1.11E+6 N on the train. The brakes are held on for 26.9 s. What is the new speed of the train? How far does it travel during...

1. Homework Statement A train has a mass of 5.77E+6 kg and is moving at 99.4 km/hr. The engineer applies the brakes, which results in a net backward force of 1.11E+6 N on the train. The brakes are held on for 26.9 s. What is the new speed of the train? How far does it travel during this...

You are on a train traveling east at speed of 14.0 m/s with respect to the ground. if you walk west toward the back of the train, with a speed of 1.4 m/s with respect to the train, what is your velocity with respect to the ground? I got the answer as 12.6 m/s east but is my answer going to...

I came home a bit early today. At one of the intermediate stations, a mother with two children got on. She and one child sat behind me and the other child, a boy of maybe 6, took the seat next to me. He basically sat with his back to me chatting to his family, but he turned round just before...

The Fourier series of a delta train is supposedly (1/T) + (2/T ) Ʃcos(nωt) ... where T is period and ω=2*Pi/T ...but when I plot this, it doesn't give me just a spike towards positive infinity, but towards negative infinity as well (see attached pic), so this does not seem to converge to the...

Homework Equations e=(product of number of driving teeth)/(product of number of driven teeth) e=(n_{out}-n_{arm})/(n_{in}-n_{arm}) The Attempt at a Solution e=(N_{p1}/N_{s1})*(N_{s2}/N_{p2}) e=1.25926 e should be 0.7941 however From there out it seems pretty trivial. I just need...

Guys, I've just come across this question regarding planetary gear train. I was asked to find the rpm of a gear within the train. but the solution given doesn't include the carrier speed within the calculations. I was asked to find the rpms to gear 4. The carrier is between 4 and 6. What...

Hi, thanks for taking a look! A toy train rolls around a horizontal 1.4-m-diameter track. The coefficient of rolling friction is 0.12. (a) What is the magnitude of the train's angular acceleration after it is released? (b) How long does it take the train to stop if it's released with an...

I am designing a gear train for my basic mechanisms class that consists of three shafts. The input horsepower is 10 and rpm is 1750. I calculated the torque of the first shaft to be 360 but I am not sure if the horsepower stays the same throughout the whole train or not. The first shaft has a...

I understand a railway locomotive generates about 4 MW of power. Also understand that an area of about 130 acres of trees (high density) can generate 1 MW of power from a wood-biomass based power generator. As railways normally have a lot of land, can not the land adjoining the tracks be used...

I have studied how gear trains work for a project I am working on, but can't find an analogous situation where the forces in the gear train oppose each other. Can someone help me? I have a 2:1 gear ratio on a dual rack and pinion gear train connected to opposing pistons, and there is equal...

The question is whether freight could be hauled along train tracks using only beasts of burden as a power source. My first ideas of a design involved tying, say, horses, to a belt which would drive a shaft, and, through simple gearing, provide power to push the train forward. The first few...

hello About Einestien's train example I can't get what it really does with the constancy of the speed of light , what would be the difference if , instead of two bolts , we have two balls thrown at the same angle ?! the observer in the train would still see the front ball first...

Homework Statement A train is passing a platform at 0.75c, and an observer, stationary and at the middle of the platform, sees two bolts of lightning simultaneously hit the front and back of the train when the train's middle was adjacent to the middle of the platform. A passenger on the train...

Hi there, I'm reading a report about the efficiency of the drive train of an electric car. The author recorded the speed and acceleration of the car over a period of time and created the graph below to illustrate the efficiency. Could anybody tell me what the relationship is between the...

Why are we moving back when train starts accelerating...can i get answers in terms of forces please?

Homework Statement Two trains leave a station, one going westbound and one going eastbound, both on the same track. A passenger who just wanted to get out of town missed both trains and, while standing on the platform at the edge of the track, observes the westbound train to be receding at 0.6c...

Centripetal force -- Train on a curved track Homework Statement You have a circular arc of railroad track to lay on the line from Dubuque to Albuquerque. The arc of track is 30º and the turn radius for the arc is 425 meters. It has to keep the path steady and secure for an ALP-46 locomotive...

Homework Statement While taking an eastbound train to work, a passenger of fixed mass finds that she weighs 542N. On the way home she weighs herself again while the train is at full speed and finds she weighs 543N. If she works 50km from home, how long is her commute if she lives at 40°S...

1. A train is moving parallel and adjacent to a highway with a constant speed of 28 m/s. Initially a car is 59 m behind the train, traveling in the same direction as the train at 43 m/s and accelerating at 5 m/s^2. What is the speed of the car just as it passes the train? Answer in terms of...

Homework Statement I've already done 10 probs, but I can't figure these out. Please help if you can. 1. An automobile traveling v = 90 km/h overtakes a L = 1.00 km long train traveling in the same direction on a track parallel to the road. If the train's speed is 80 km/h, how long does it...

Hello please see my problem below, 1. A gear train is to be designed to transmit power from shaft 1 to shaft 2 with the following condition: (i) Shaft 1 (driven by an electric motor) rotates at 100 revs min–1. (ii) Shaft 2 is to rotate at 400 revs min–1 in the opposite direction to shaft 1...

Homework Statement A car moving at 60km/h meets a train of length 1km moving at 40km/h along a track parallel to the road. What distance does the car travel in passing the length of the train given that they travel a) in the same direction, or b) in opposite directions? Homework Equations...

Hello all: I have a quick question concerning a variation of a planetary gear train I am working on. If I want a sun gear and then two planetary gears in between the sun and ring gear (like is shown in the attached picture), how do I find the number of teeth for the ring gear? Would the...

Homework Statement A train has a mass of 5 million kilograms and is traveling south at 22 m/s. If the train driver has to initiate a panic stop, how far will the train go before it comes to a halt. Use 0.08 as the coefficient of kinetic friction. m=5*106 kg v=-22 m/s μ-kinetic...

Hi there, I'm deeply ignorant about physics, but I'm curious about what conserved quantities (if any) are transferred from a section of railroad track to a train that's rolling along the track. I take it that in many situations if the track were absent, the gravitational attraction between...

Homework Statement A train starts from rest. The train (including the locomotive and all the freight cars) is 120 m long. A person standing still next to the front train (not in front of it -- she is NOT run over!) notices that the end of the last freight car passes her exactly 2 minutes...

Homework Statement A bob of mass 0.35 kg is attached by a string to the roof of a train that is accelerating rightwards and the mass is inclined at an angle of 15° to the left. Show that the acceleration of the train is 2.63 ms^-2. The Attempt at a Solution I don't know how to exactly...

I have just started reading "The Elegant Universe" by Brian Greene. In chapter 2, on pages 34-37 he uses an analogy to help explain relativity, and it made me think about the following scenario, I'm wondering if I'm missing something: 2 people face each other on a train moving at a very high...

Homework Statement An open-topped railway wagon of mass M is rolling freely along straight level frictionless track at a constant velocity v0. At time t=0 the wagon enters a heavy rain shower and starts to collect rainwater. The rain falls vertically. As a consequence the wagons mass increases...

Hi all 1 ) A train of 3000 KN weight starts from rest and reached a velocity of 54 km/h after one min . if the frictional resistance of the track is 5N/KN of the train's weight . Find the tractive force developed by the engine ? I don't understand what is mean "tractive force " ...

When it stops, you move forward but at the very last moment just before it comes to a complete halt (when it sounds relatively quiet), it moves back. On a bus or a car, I'm guessing that would be caused by the front of the car 'jerking' back up, but a train seems more...rigid? Also, why do the...

Hi, For my Writing for Engineers class I have decided to take on a feasibility inquiry: "Is it possible to power a NYC subway train using wind turbines atop that same train?" (provided that a NYC subway train requires 2.1 MW of power to run at 55 mph) Now, I have come to the conclusion that...

Hello Everybody! I have a question - If I'm standing inside a train and I jump up in the air I will land in the same place, I think. Likewise, if I'm holding a pen in my hand and I throw it up in the air it will land again in my hand. But if I stood on top of the train, on the roof, and I...