Posted by admin | Posted in Uncategorized | Posted on 09-08-2004
Tags: bike, cycling, design, njs, straight track fork, straight track hairstyles, straight track stables, straight tracks, track
Straight Track
a railroad train travels forward along a straight track at…?
a railroad train travels forward along a straight track at 80 m/s for 1000 m and then travels at 50 m/s for the next 1000 m. what is average velocity?
Think of the time. The 80 portion only takes 12.5 seconds and the 50 portion takes 20 seconds. This should tell you immediately that the answer is going to be closer to 50 than 80, definitely not in the middle at 65.
v=d/t
v=2000m/32.5s
..
Straight Track
How to grow your model train track without moving house
If you want to build your model train collection then you need to start by building more model train track. This is the first step, as your trains need something to run on. It is best to start small and then build up from there. You can find all the train track that you need in the model stores, online or in discount shops.
You should also think about joining model train clubs in order to learn form other members and enthusiasts. Often you can buy trains, track and other accessories from them for a good price. The price that you want to pay is the first consideration, as well as the space that you have available to build in.
If you have limited money then you need to look for discounted prices. As such, you can find old collectors that may be unable to continue, have passed away or want to sell their collections. You can often find these people in newspaper adverts, on auction sites, or advertised in model train clubs.
If you are able to find these old collections then you can get a great again. Otherwise, you can choose to buy all your trains and track brand new. This is a nice way to build your collection but it is going to cost you a lot of money.
The next thing you need to think about is the space that you have to build in. If you have a large space or room in your house then you are set. Also if you have a garden that you can use, then you may want to opt for the garden railroad scale trains. This is a luxury that most hobbyists simply don’t have.
In order for most people to keep building their model train tracks, then need to think of new innovative ways to expand. This can be done but it requires a certain level of skill and planning. You need to know the basics of track building and also have the skill to execute your plans.
You can think about adding more ovals, curves and bends into your track. You can also have two-tier track layouts in order to maximise your space. Another idea is to use straight track to replicate a train station. This is often the most difficult type of model train track to setup, as it requires skill to allow the trains to change direction.
Still, with practice and planning you can certainly achieve these results and ensure that your train collection keeps growing. You can also have great fun within a small area. If you have very limited space then you should think about using the smaller scales of trains and track. Use the N scale.
The N scale is very popular because of the details that are given to every locomotive. The result is very life-like and realistic. The trains also look great when they are running around the track.
As you can see, there are many options for expanding your model track within the space you have. You just need to be creative and use some imagination and skill.
About the Author
Philip Redfearn is an avid model train enthusiast. For more great information on model trains, and to sign up for a free Ultimate Model Railway Secrets 11 lesson mini-course, visit http://www.ultimatemodelrailway.com
A train is traveling down a straight track at 20 m/s when the engineer applies the brakes, resulting in an acc?
A train is traveling down a straight track at 20 m/s when the engineer applies the brakes, resulting in an acceleration of -1.0 m/s2 as long as the train is in motion. How far does the train move during a 40 s time interval starting at the instant the brakes are applied?
If the direction of the train travelling is taken as +ve, then velocity = +20m/s initially, and acceleration, is correctly -1m/s²
Equation:
s = ut + 0.5a*t²
s = 20*40 + 0.5*(-1)* 40²
s = 800 – 800
s = 0
How is this possible? The displacement of the train is zero – it is where it originally started from.
In order to solve for what has happened, let us calculate the displacement at 10s intervals:
Displacement after 10 seconds :
s = ut + 0.5at²
s = 20*10 + 0.5*(-1)* 10²
s = 200- 50
The train has travelled 150m in the 1st 10 seconds
You calculate the time for 20,30 and 40 seconds in exactly the same way:
Displacemenmt after 20seconds :
s = 400 – 0.5*(-1)* 400
s = 400-200
s = 200m away from start
Displacement after 30sec
s = 600 – 450
s = 150m away from start
And we have already calculated that at 40 seconds the train is back at its starting position. It is clear therefore that the train has slowed down and come to a stop, and the backward accelerating force has caused it to move backwards to its original position.
How far did the train travel to come to a stop? V = 0
V² = u² +2*a*s
0 = 20² +2*(-1)*s
2s = 400m
s = 200m
The train traveled 200m, came to a stop and then reversed 200m back to its original starting position:
Total distance travelled = 400m That is the answer.
Note that this answer is somewhat not in conformance with real life. In physics we are calculating on a retarding force slowing down the train. And that this force continues to act on the train throughout the whole journey. That is after stopping the force accelerates the train backwards to wards the origin. That is what the above solution is based on. But in reality, by applying the brakes, the train will have stopped at 200m after 20 seconds. The force no longer applies and the train will remain stationary 200m away for the remaining 20seconds. Under these conditions, the total distance travelled will be only 200m.
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