Opent top freight train with coal

In summary, an open top freight train with coal is a specialized type of train used for transporting coal. It works by using gravity and interconnected cars to evenly distribute the coal, making it a cost-effective and efficient method of transportation. The coal is loaded and unloaded using conveyor belts or chutes, and there are some safety concerns regarding exposure to the elements and coal dust. Proper safety measures must be taken to ensure the safe transport of coal.
  • #1
12boone
21
0
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. <-----
cannot be determined from the information given
 
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  • #2
Looks good to me. Use conservation of momentum to confirm.

[tex] m_1v_1 = m_2v_2 [/tex]

m2 is greater than m1 therefore v has to decrease.
 
  • #3


Based on the information given, the velocity of the car will decrease. This is because when the coal is dumped into the car, it adds mass to the car. According to Newton's second law of motion, an increase in mass will result in a decrease in velocity if the force remains constant. In this case, the force of the train pushing the car remains constant, but the mass of the car has increased, causing the velocity to decrease. Additionally, the added mass may also increase the friction between the car and the track, further slowing down the car's velocity. Therefore, the correct answer is that the velocity decreases.
 

1. What is an open top freight train with coal?

An open top freight train with coal is a type of train used for transporting coal. It consists of a series of open top cars that are specifically designed to carry coal. These cars have no roof and are loaded with coal through the top, hence the name "open top".

2. How does an open top freight train with coal work?

An open top freight train with coal works by using gravity and a series of interconnected cars to transport coal from one location to another. The coal is loaded into the cars through the top and as the train moves, the coal is distributed evenly throughout the train. This allows for efficient and continuous transportation of large amounts of coal.

3. What are the advantages of using an open top freight train with coal?

There are several advantages to using an open top freight train with coal. Firstly, it is a cost-effective method of transporting large quantities of coal. The open top design allows for easy loading and unloading of the coal, making the process quick and efficient. Additionally, the use of trains reduces the need for trucks, which helps to reduce traffic and carbon emissions.

4. How is the coal loaded and unloaded from an open top freight train?

The coal is typically loaded into the open top cars using a conveyor belt or loading chute. This allows for a continuous flow of coal into the cars. When the train reaches its destination, the coal is unloaded using a similar method, either through a chute or by using a rotary car dumper. This process is also quick and efficient, allowing for a speedy turnaround time for the train.

5. Are there any safety concerns associated with open top freight trains with coal?

Yes, there are some safety concerns associated with open top freight trains with coal. The open top design can leave the coal exposed to the elements, which can cause it to become wet and potentially shift during transport. This can lead to derailments or accidents. Additionally, coal dust can be a potential hazard to workers and the environment. Proper safety measures, such as covering the cars and minimizing dust, must be taken to mitigate these risks.

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