Train Definition and 650 Threads

Homework Statement A gear ratio is req from A/D of 1:100 and that it will be necessary to redesign D so that it has 100 teeth. Determine: a)number of teeth on c b)number of teeth on planet gears. This followed on from another question. An epicyclic gear c is the annulus and is fixed. The...

Homework Statement Consider a train that rounds a curve with a radius of 570 m at a speeed of 160 km/h (a) Calculate the friction force needed on a train passenger of mass 75 kg if the track is not banked and the train does not tilt. (b) Calculate the friction force on the passenger if the train...

Homework Statement The Doppler shift was first tested in 1845 by the French scientist B. Ballot. He had a trumpet player sound a 463 Hz note while riding on a flat-car pulled by a locomotive. At the same time, a stationary trumpeter played the same note. Ballot heard 5 beats/s. How fast was...

A 0.50 kg battery-operated toy train moves at a constant velocity of 0.30 m/s along a level track. The power developed by the motor is 2.0 W and the total force opposing the motion of the train is 5.0 N a) Calculate the efficiency of the train's motor b) Assuming the efficiency and the...

You are riding a roundabout which is itself on a train traveling in a straight line at a constant speed. Would you notice any different inertial effects or forces compared to when the train is stationary? I think not but am discussing this with a friend who says this: "If the train was...

Its my first post here so i say hello to you. I have a 'problem' with understanding relativity. Here is the thing: We have a train and a station. Station and train have same lengths measured in rest (v=0). Station has attached two detectors, one at rear and one at front. They have built...

Homework Statement A railroad engine pulls a train of mass 1.3*10^6 kg up an average slope of 1.1 degree for a distance of 57.0 km. If the speed of the train is 48.0 km/h, what is the average power produced by the engine? Homework Equations a = Fn/m The Attempt at a Solution...

A train is traveling up a 3.73 degree incline at 3.25 m/s when the last car breaks free and begins to coast without friction. A) How long does it take for the last car to come to rest momentarily? B) How far did the last car travel before coming to rest? Newtons Second Law I know...

Homework Statement A toy train rolls around a horizontal 1.8 m diameter track. The coefficient of rolling friction is 0.11. What is the magnitude of the train's angular acceleration after it is released? How long does it take the train to stop if it's released with an angular speed of 31 ...

Hello, I am following a proof in a book, in which the author makes use of the fact (without proving it) that the Fourier serie of a train of Gaussians is given by the following relationship: \mathcal{F} \{ \sum_{n=-\infty}^{+\infty}\frac{1}{\tau}e^\frac{-\pi(x-n)^2}{\tau^2} \} =...

Interesting four minute video with a magnetic levitation superconductor train http://www.youtube.com/watch?v=5el1A5B-h3Q&feature=player_embedded Perhaps a good demonstration for teachers

Hi all, I've read some references to an example of a person on a train using a flashligt and one outside the train also using a flashlight and as I understand it both flashes would travel at the same speed even if the train was moving? Also as I understand nothing can travel faster then the...

I was wondering, within a static train, for a fly which is currently floating in the air and not moving at all, what will happen if : 1) The train start to accelerate and moving forward. Will the floating fly experience inertia and being pushed backward? Does the inertia caused by air...

Homework Statement Two trains emit 516-Hz whistles. One train is stationary. The conductor on the stationary train hears a 3.5-Hz beat frequency when the other train approaches. What is the speed of the moving train? b = beat f'_b = 3.5 Hz f = 516 Hz Homework Equations f_b = |f_1...

Many people have difficulties to understand how time dilation can be consistent with he special relativity principle: "According to the observer on the Earth, the observer at the spaceship is aging slower, but according to the observer at the space ship, the observer on the Earth is aging...

A train moving up an incline at 4 degrees has it's last train compartment detached. The train was moving at a speed of 5 m/s when the compartment breaks free. How far did the train get before the speed momentarily reaches zero? No other information is given, but using all that was provided, I...

1. What determines the frequency of a train of waves? 3. v= (Frequency)(wavelength)

Homework Statement You take a subway every day for 23 days to get to school and back. Time of your arrival on the station is random and waiting time for a train to arrive is between 0-3 minutes. What is the probability that the sum of waiting time over 23 days is not going to exceed 80 minutes...

Hi, I've seen several posts/comments here about how wracking your brain on a new concept - especially in mathematics/physics - is painful, but at the same time enjoyable. When I encounter something that is painfully difficult (especially when it's math-related), I feel like throwing the book...

I was just wondering while watching Spider-Man 2 .. Would you need MORE or LESS gravity than the standard of 9.8 m/s2 in order to stand on the side of a train like he did? I want to say less like the moon, but I feel like on the moon you don't stop moving and would keep rotating. So would you...

Homework Statement 1800 HP motor spins at 6600 RPM FIND: 3 stage reduction (and 90deg turn up) to main rotor to spin at 300 RPM 2 Stage reduction (and 90deg turn to the side) to tail rotor to spin at 1700 RPM Homework Equations torque = 525*HP/RMP Saftey factor = 2 Loading...

hello, can someone help me with this, a wagon train of given mass collides with a passenger train at rest... the train loses 27% of kinetic energy after the collision... find the mass of the passenger train... so what i did is, i put this formula for inelastic collision,v(final)=...

Homework Statement I have a question to calculate the spectrum of an infinite pulse train from a mode locked laser with each pulse having I(t) proportional to exp(t^2 / tau^2) where tau is the pulse width. tau is 50 fs, repetition rate is 100Mhz, wavelength of operation is 800nm. Please...

Homework Statement In the 1950’s, an experimental train that had a mass of 22500 kg was powered across a level track by a jet engine that produced a thrust of 4.63 × 105 N for a distance of 533 m. Find the work done on the train. Answer in units of J. Homework Equations The...

[PLAIN]http://img573.imageshack.us/img573/9443/1132y.jpg So I did what I thought was right, but I'm a little confused on whose frame they are talking about when they say she arrived at the back of the train at the same time the back of the train leaves the tunnel..I think it makes a...

A head-on collision occurs between a flying bee and a moving train. The bee smashes and sticks onto the front of the train and both continue in the direction of the train. For the bee to completely reverse its direction, does the bee's velocity need to equal zero at any point during this...

you are on a train moving along a track at constant velocity. hanging from a switcase in an overhead luggage compartment is a balloon the end of a string. as long as the train continues at constant speed you observe the string is vertical . as you neer your destination you obsrve the ball swing...

The train paradox used to demonstrate relativity of simulatneity says that ( I will assume most people are familiar with it and therefore be brief) the observer on the train moves into the light from the front of the train and away from the light coming from the back of the train, therefore...

A subway train starts from rest at a station and accelerates at the rate of 2.0m/s^2 for 10s. It runs at a constant speed for 30s, and then decelerates at 2.4m/s^2 until it stops at the next station. Find the total distance between the stations and the average speed of the train.

Homework Statement Consider four clocks at different locations in train: A and D at two ends, B and C midway between the center and A and D respectively. How can a people standing at the center of the train synchronize all four clocks with a mirror M which he can install beforehand at...

Throughout our relativity section in class, we've had two problems with light and a train, and I'm confused as to why they are two different answers. The first is that Mavis is on a train moving close to the speed of light, and lightning bolts hit the left (back) and right (front) part of the...

Homework Statement The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.25 with the floor. If the train is initially moving at a speed of 48 km/h, in how short a distance can the train be stopped at constant acceleration without causing the...

The engineer of a passenger train traveling at 25m/s sights a freight train whose caboose is 200m ahead on the same track. The freight train is traveling at 15m/s in the same direction as the passenger train. The engineer of the passenger train immediately applies the brakes, causing a constant...

[b]1. Homework Statement [/b A railway engine of mass 100 tonnes is attahched to a line of trucks of total mass 80 tonnes. assuming there is no resistance to motion find the tension in the coupling between the engine and the leading truck (a) when the train has an acceleration of 0.020 ms/1^2...

1. (a)A train slows down at a constant rate as it rounds a sharp circular horizontal turn. Its initial speed is not known. It takes 16.6 s to slow down from 86 km/h to 30 km/h. The radius of the curve is 162 m. As the train goes around the turn, what is the magnitude of the tangential...

Homework Statement Two trains, each having a speed of 30 miles/hr, are headed at each other on the same straight track. A bird that can fly 60 miles/hr flies off one train when they are 60 miles apart and heads directly for the other train. On reaching the other train it flies directly...

Homework Statement In the 1950's, an experimental train that had a mass of 2.50 x 10 to the power 4 kg was powered across level track by a jet engine that produced a thrust of 5.00 x 10 to power 5 N for a distance of 500m. a.) Find the work done by the train Work = (500,000)(500) Work...

I'm trying to understand the relativity train thought experiment. One of the key concepts seems to be that the clocks at the front and back of the train are "synchronized" such that the clock at the front of the train is running slightly behind the clock at the back of the train (as seen by an...

I was watching I LOVE LUCY and they were traveling on a train. Lucy kept pulling the emergency lever for various reasons. One of the times, Ricky was taking a leap up into the air and when the train stopped, he ran into the wall of the train because he was making the leap but the train...

A friend of mine posed this SR paradox to me a few weeks ago and I was unable to come up with a convincing answer (nor have I been convinced by any I've heard!). The problem is as follows: Assume we have a train track which has certain gaps in it. At rest, the train which moves on the track is...

I have a project where I am using a hobby servo with 133 oz/in of torque which currently has a 32 tooth timing pulley on the output shaft ard driving a 102 tooth timing pulley connected to a camera platform that has a 950g camera sitting on it. The issue is that the camera weight needs to be...

A train is moving parallel and adjacent to a highway with a constant speed of 31 m/s. Initially a car is 49m behind the train, traveling in the same direction as the train at 43 m/s and accelerating at 3 m/s/s. What is the speed of the car just as it passes the train? Answer in units of...

Homework Statement A freight train has a mass of 1.4x107 kg. If the locomotive can exert a constant pull of 6.7x105 N, how long does it take to increase the speed of the train from rest to 84 km/h?Homework Equations F=ma a=v/tThe Attempt at a Solution I converted 84 km/h into 23.3 m/s. F=ma...

Homework Statement A 12 metrick ton train is moving with a 72KMH velocity.when brakes It comes to rest in 2 mins.find the force caused by the force? Homework Equations F=ma a=v/t The Attempt at a Solution didn't get the correct answer which is given on the answers page(only the...

Homework Statement The train (92m long) starts from rest, constant accel. at t=0s The car at t=0s just reaches the end of the train. The car is moving at a constant velocity. At time t=14s the car just reaches the front of the train. The train eventually pulls ahead of the car, and at t=28s...

Homework Statement A cuboid of constant density, height h and length of bottom side=L is in the train. Determine the minimal necessary acceleration (of the train) needed for the cuboid to fall. There is no slipping. (that's all that is stated in the text) Homework Equations not...

I've been trying this problem for a while now and can't seem to get the given answer. I know I'm probably making an elementary mistake somewhere but I can't find it. Homework Statement A track is mounted on a large wheel that is free to turn with negligible friction about a vertical axis. A...

NOTE: This is no homework, just me having fun with physics, maths, logics etc. Do not take this problem as priority, there are surely more serious and urgent problems out there! Homework Statement A passenger standing beside the railway noticed that the first wagon of the electric train...

This is a question off a take-home exam and I just need some help getting started on each part. Homework Statement A train of length L moves at speed 3c/5 with respect to the ground. A ball is thrown from the back to the front, at speed c/3 with respect to the train. How much time does this...

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