The Physics of the Bullet Train: Exploring Zero MPH

In summary, the conversation revolved around a physics lesson on the bullet train in Japan. The train is capable of traveling at 190 miles per hour and on a day with no gravity and air, a man fires a bullet from the back of the train. The teacher explained that an observer outside the train would see the bullet going at 0 mph. This is because the bullet and the train are both traveling at 190 mph in opposite directions, resulting in a relative speed of 0 mph between the two objects.
  • #1
bondinthesand
15
0
So today in physics my teacher was talking about the bullet train that is in japan. SO this train is traveling at 190 miles an hour, and on this day there is no gravity and no air. a man walks to the back of the train and fires a bullet from the back. My teacher said that a person watching the train go by will see the bullet go 0 mph. why is that??
 
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  • #2
If you fill in the details, then you can start to create a picture for yourself.

First for the example your teacher would have to state that this bullet travels at 190 mph, which is AWFULLY slow (may a low power air rifle). Given that information what is the only way to get 0 mph from two objects, each traveling 190 mph seperately?
 

1. How does the bullet train maintain its speed without an engine?

The bullet train uses a technology called electromagnetic propulsion, which involves the use of powerful magnets to propel the train forward. This eliminates the need for a traditional engine and allows the train to reach high speeds.

2. What factors contribute to the bullet train's ability to reach speeds of over 300 MPH?

There are several factors that contribute to the bullet train's speed, including the use of aerodynamic design, lightweight materials, and advanced braking systems. Additionally, the train runs on dedicated tracks that are straighter and have fewer curves, allowing for a smoother and faster ride.

3. How does the bullet train prevent derailment at such high speeds?

The bullet train is equipped with a sophisticated system of sensors and computers that constantly monitor and adjust the train's position on the tracks. This allows for precise control and prevents derailment, even at high speeds.

4. How does the bullet train use regenerative braking to increase efficiency?

The bullet train uses regenerative braking, which means that the kinetic energy produced during braking is captured and converted into electricity. This electricity is then used to power the train, reducing its energy consumption and increasing efficiency.

5. How is the bullet train's speed limited in areas with sharp turns or steep inclines?

The bullet train's speed is limited in areas with sharp turns or steep inclines to ensure the safety of passengers. This is done through a combination of speed restrictions, advanced braking systems, and tilting technology, which allows the train to lean into curves and maintain stability.

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