Train Definition and 650 Threads

Question 3 text 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? Question 3 answers It increases. It remains the same. It decreases...

If a fly were flying very fast, perhaps .5c, and it struck a train, what would probably happen? A red-hot little fly hole through the train? A dent and a spray of fly plasma? A slow moving train? Something else? Ignore air resistance, and consider the train to be a series of 3cm steel...

I need some help with this question: Two people, who are traveling on a bullet train between Tokyo and Kyoto, are willing to tolerate acceleration magnitudes as large as 0.2 g. The driver wants to change speeds from 250 to 300 km hr-1 on a curved piece of track. If the radius of curvature...

Homework Statement A train slows down as it rounds a sharp horizontal turn slowing from 90.0 km/h to 50.0km/h in the 15 s that it takes to round the bend. The radius of the curve is 150 m. Compute the acceleration at the moment the train speed reaches 50km/h. Assume it continues to slow down...

If I hang a pendulum on the ceiling of an accelerating train (with an initial angular displacement), how would the angular acceleration be affected? My intuition told me that the angular acceleration of the pendulum should be affected by the acceleration of the train. But...whether the...

Three identical train cars, coupled together, are rolling east at 4 m/s. A fourth car traveling east at 6 m/s catches up with the three and couples to make a four-car train. What is the speed of the four-car train? I have no idea what to do. Please Help...thanks in advance :)

Homework Statement A train slows down as it rounds a sharp horizontal turn, slowing from 90.0 km/h to 50.0km/h in that 15.0s that it takes to round the bend. The radius of the curve is 150m. Compute the acceleration at the moment the train speed reaches 50.0 km/h. Assume that it continues...

http://www.cnn.com/2008/US/09/15/train.collision/index.html

Hello, I have a problem connecting an answer to the question Describe how superconductors and the effects of magnetic fields have been applied to develop a maglev train. I have the information on the superconductors, but i don't have the information of the maginetic field how it is applied. I...

http://www.newsday.com/news/nationworld/nation/la-me-traincrash13-2008sep13,0,245095.story" Man, this is really terrible. The last time I remember something like this happening was when some guy left his car on a Metrolink track. A sorry example of physics at work :(.

Homework Statement A fugitive tries to hop on a freight train traveling at a constant speed of 6.0m/s. The fugitive starts from rest and accelerates at 4.0m/s^2 to his maximum speed of 8.0 m/s. How long does it take him to catch the train? What is the distance traveled to catch the train...

I try my best to solve this problem but couldn't ...here is the question 1.the train starting rest leaves a station with a constant acceleration.at the end of 5.34 s,it is moving at 15.549m/s. what is the train displacement in the first 3.15 s of motion?answer in units of meter. I try in...

Homework Statement A light-rail train going from one station to the next on a straight section of track accelerates from rest at 2.27 m/s2 for 15.7 s/ It then proceeds at constant speed for 1346 m before slowing down at 2.2 m/s2 until it stops at the station. What is the distance between the...

Hi, I was wondering if i could gt anyhelp with some research i was doing? I'm looking at the Maglev train systems used in Japan, and some of the developing ideas in the USA and Germany. What i was wondering is if anybody would be able to help me compile a list of all the physics concepts...

As a train accelerates away from a station, it reaches a speed of 4.6 m/s in 5.2 s. If the train's acceleration remains constant, what is its speed after an additional 6.0s has elapsed? I know I should be able to do this,but nothing I try works.If anyone could just point me the right way...

Homework Statement (a) If the maximum acceleration that is tolerable for passengers in a subway train is 1.54 m/s2 and subway stations are located 816 m apart, what is the maximum speed a subway train can attain between stations? (b) What is the travel time between stations? (c) If a subway...

Homework Statement A train moves past a tower at a speed of 0.78c. The train has a rest length of L' = 450m. When the front of the train passes the tower, the clocks in the tower and in the front of the train are synchronized to t=t'=0s. The instant that the back of the train passes the...

An isotropic point source of neutrons emits 10E8 fast neutrons per second. It is 3m horizontally away from a train track. A train goes by at 60 miles per hour. Ignoring scattering and attenuation, what is the fluence (i.e. neutrons per meter square) of neutrons that would strike a pasenger at...

Maybe the US government has a "no-bad-news-allowed" policy just like the Enron execs had. Or maybe the Bush government is leaving a huge fiscal train wreck (I think that's actually a technical term) for the next president on purpose. I think everyone knows how partisan they are. Check it out...

I want know that can we build a long Permanent magnet for a Maglev way ? Please say that its possible ? (i attached one picture , with that you can understand that what is my question and what is a long Maglev way by a Permanent magnet)

Homework Statement A train leaves the station at 10:00 and travels due south at a speed of 60 km/h. Another train has been heading due west at 45 km/h and reaches the same station at 11:00. At what time were the two trains closest together? Homework Equations c^{2}=a^{2}+b^{2}The Attempt at a...

Homework Statement A subway train rounds an unbanked curve at 67 km/h. An unused strap makes an angle of 15 degrees to the vertical. What is the radius of the turn. The book answer is 132 m. Homework Equations F = ma = mv^2/r The Attempt at a Solution A...

There's one of the paradoxes with SR that I've never actually seen an answer for. There is a man on a train traveling at a velocity where length contraction starts to matter. Say, .3c. There are some dirty bandits that have rigged up a trap door system in a mountain up ahead on the tracks...

Homework Statement Suppose the two lightning bolts shown in the figure 37.5a in the txtbook are simultaneous to an observer on the train. Show that they are not simultaneous to an observer on the ground. (Relevant Diagram Attached) Homework Equations The Attempt at a Solution...

Homework Statement I need help finding the exponential Fourier series for the pulse train below. http://img329.imageshack.us/img329/1184/20080427091409ev5.jpg Homework Equations p_T(t)=\sum_{n=-\infty}^{\infty}{D_n e^{j2nt} D_n=\frac{1}{T_0}\int_{T_0}^{}{x(t)e^{-j2nt}dt}The Attempt at a...

Hi. I am learning special relativity and have decided to take Einstein's train example to practice some calculations. I have given the train speed v=1/4c and have decided on distances that make the side observer's space and time calculations straightforward. I have calculated everything using...

Homework Statement A train whistle sounds. As the train approaches, a stationary observer near the track hears the whistle at a frequency of 500 hertz. As the train recedes the observer hears the whistle at a frequency of 450 hertz. what is the speed of the train? v (sound) = 343 m/s...

1.A passenger train is traveling at 25m/s around a circular curve of 1000 m radius. if the maximum total acceleration is not to exceed g/10, determine the maximum rate at which the speed may be decreased. Take g = 9.81 m/s^2. Answer is 0.756 m/s^2, but what steps do i take to find the answer?

If a train is traveling 100mph in one direction and a fly is traveling 5mph the opposite, and the fly hits the train what speed is the fly traveling at the point of impact?

1. The figure below shows the drive train of a bicycle that has wheels 67.3 cm in diameter and pedal cranks 17.5 cm long. The cyclist pedals at a steady angular rate of 76.5 rev/min. The chain engages with a front sprocket 15.2 cm in diameter and a rear sprocket 7.25 cm in diameter. 2. v...

i'm having a LOT of trouble understanding pulse train response in RL and CR circuits... could someone please recommend a good reading over the internet... i understand LR and RC response fairly better... and use the snapshot idea to get voltage equations etc... but its very confusing and i...

A subway train starts from rest at a station and accelerates at a rate of 1.60m/s2 for 14.0s. It runs at a constant speed for 70.0s and slows down at a rate of 3.50m/s2 until it stops at the next station. Find the total distance covered. I have no idea what to do for this problem.

Hi ! can anyone help me ? A train locomotive is pulling two cars of the same mass behind it. Show that the tension in the coupling between the locomotive and the first car is twice that between the first car and the second car, for any nonzero accelerationv of the train . thanks

this questions has been bugging me for a long time now: Imagine you are in a train, in a compartment, sitting there. Then suddenly you see outside of the window a bird that flies exactly at the speed of the train. It gets closer and closer, until it flies into the compartment through an open...

i have no idea at all how to do these. someone help please 1. On a hot summer afternoon, Keith and Nate are out fishing in their rowboat when they decide to jump into the water and go for a swim. Keith, whose mass is 65.0 kg, jumps straight off the front of the boat with a speed of 2.00 m\s...

Homework Statement A deisel train accelerates uniformly from rest to reach 60km/hr in 6 minutes, after which the speed remains constant. Calculate the total time taken to travel 6km and the acceleration. Homework Equations s= ut v= u+at s=ut + 0.5*at^2 The Attempt at a Solution I'm not sure...

suppose i am moving in a train and at the same time playing a violin .Is the dopller effect/formulae applicable for me

Homework Statement What speed must a 15 metric ton train travel to have a momentum of 700,000 kg(m/s)? Homework Equations Momentum = mass X velocity change in momentum = mass(Finalvelocity - initialvelocity) The Attempt at a Solution I though you did it like this... 15...

A high speed train is traveling at a speed of 41 m/s when the engineer sounds the 416 Hz warning horn. The speed of sound is 345 m/s. What is the frequency of the sound as perceived by a person standing on at the crossing when the train is leaving? I used the equation: f0=fs/(1-vs/v) f0=416...

Homework Statement A person is standing on top floor anywhere along a measuring tape that runs from point A to point B. There is a train on the ground level directly below that floor. The distance between the top floor and the level of the train is 4.95 m. Train is going from Photogate A (a...

why we do not observe any “lack of simultaneity” when we substitute sound signals for the light flashes in the “thought experiment” with a train moving past a platform (Einstein's lightning strike-train "thought experiment")? this has troubled me for 5hours now. i don't know whether it is too...

A 10,500kg railroad car travels alone on a level, frictionless track with a constant speed of 15.0 m/s. An additional 5,000kg load is dropped from a tower onto the car. What will then be its new speed? 2. Homework Equations Momentum of conservation: m1i+m2i=(m1+m2)vf 3. The...

Homework Statement When 2.66 grams of a compound containing only carbon, hydrogen, and oxygen is burned completely, 4.50 grams of CO2 and 1.10 grams of H2O are produced. What is the empirical formula of the compound? Answer Options: C5H6O4 C5H6O5 C5H12O5 C4H6O3 C4H8O3 C3H4O3 C4H4O5...

Homework Statement A train is moving eastward at 60.0mi/hr. A waiter is walking westward at 2.0mi/hr. A fly is crawling north across the waiter at 3.0mi/hr. What is the velocity of the fly relative to the tracks? The Attempt at a Solution I don't understand what it means by the fly...

I need some physics experts to help settle a debate between me and a coworker. Would it be possible for a large enough puddle to derail a passenger train? Obviously if you tried to drive a train through a lake it would derail, but could there ever be enough water from heavy rainfall to do the...

Homework Statement A 8000 kg freight car rolls along rails with negligible friction. The car is brought to rest by a combination of two coiled springs as illustrated in the figure below. Both springs are described by Hooke's law with k1 = 1600 N/m and k2 = 3000 N/m. After the first spring...

Homework Statement Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60m long. The first moves past her in 1.50 s and the second in 1.10 s. Find the constant acceleration of the train. Homework Equations...

the setting: A train travels at high speed. A runner on the train sprints towards the back of the train with the same speed (wrt to the train). as the train moves forward (wrt the earth). therefore the runner doesn't move wrt to earh. The paradox: the runner's clock runs slower than compared...

if a man is standing on a point "A" inside a train moving at a very high speed then he jumped . will he land on the same point A?

1. Homework Statement A train is moving parallel and adjacent to a highway with a constant speed of 33 m/s. Initially a car is 32 m behind the train, traveling in the same direction as the train at 47 m/s and accelerating at 4 m/s^2. What is the speed of the car just as it passes the train...