When a person is sitting in a car, what does it mean if he sees the scenery moving backward out of the window
People take their own car as a reference. When the car moves forward, they will see the scenery outside the window moving backward
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- 1. The length of a and B buses are 150 meters and 200 meters respectively. They are running on parallel tracks. It is known that a passenger on car a has measured that the time for car B to pass outside his window is 10 seconds, so what is the time for the passenger on car B to see car a pass outside his window______ Seconds
- 2. The length ratio of a and B trains is 4:5. They travel in the same direction. Xiaoming on car a sees that car B has passed from back to front for 20 seconds. How many seconds does Xiaodong on car B see that car B has passed car a?
- 3. When passengers on the train look out of the window, the trees on both sides of the railway quickly retreat. What is the reference for passengers to choose
- 4. There is an observer on the train platform. When the train starts, he just stands at the front end of the first carriage. After the train starts, he accelerates evenly. After 4 seconds, the first carriage passes the observer, and the time for the whole train to pass the observer is 20 seconds. If each carriage is equal in length and the length of carriage connection is not taken into account, we can find: (1) how many carriages are there in this train; (2) the last 9 carriages pass the observer The time experienced by the observer
- 5. If a person throws an object horizontally towards the rear of the train in the train carriage, what can another person standing on the ground platform see the trajectory of the object
- 6. An observer on the platform stood at the front of the first carriage as the train started There is an observer on the platform. When the train starts, he stands near the front end of the first carriage. The first carriage passes him in 10 seconds. Suppose the train moves in a straight line with uniform acceleration, what is the time interval for the seventh carriage to pass him? If there are 10 carriages, what is the time interval for all the carriages to pass him/
- 7. A train runs at a constant speed on a flat track, and a passenger drops two objects a and B from the window. If the air resistance is negligible, what will happen when they fall freely () A. A is directly below B B. A is directly behind B C. A is under the front of B D. A is under the back of B I want a solution But I lost it in different order.
- 8. When Xiao Ming was on the train, the first time Wang looked out of the window, he happened to see that the number of kilometers on the roadside milestone was one by one, and the number was six double digits When you look out, you can see that the kilometer on the roadside milestone is just the original two digit number, and the front and back positions have been exchanged; when you look out of the car window after another 20 minutes, the kilometer on the roadside milestone is a three digit number, and it's just the middle of the two digit number you see for the first time, with an extra 0. According to the above information, calculate the train speed When Xiao Ming took the train, when he looked out of the window for the first time, he saw that the number of kilometers on the roadside milestone was two digits of six. When he looked out of the car again, he saw that the number of kilometers on the roadside milestone was just the original two digits, and the front and back positions were exchanged. After 20 minutes, when he looked out of the window again, the number of kilometers on the roadside milestone was three digits, According to the above information, the train speed can be calculated
- 9. Xiao Ming is looking out of the window at the milestone. The number Xiao Ming sees at 12 o'clock is a two digit number, and the sum of the numbers is 7; the number he sees at 13 o'clock is the same as the previous number On the contrary, what you see at 14:00 is a three digit number, which is one more 0 than what you see at 12:00. Find the number you see at 12:00? (the car runs at average speed)
- 10. When a train leaves from the station, it accelerates uniformly and moves in a straight line. When it starts, the operator on duty stands beside the front end of the first carriage. It takes 4 seconds for the first carriage to pass by him, and 20 seconds for the whole train to pass by him. The length of each carriage is equal, and the length of the carriage joint is not included. How many carriages are there in this train? How long does it take for the last nine carriages to pass by him
- 11. The two trains are both 180 meters long. If the two trains run in opposite directions, it will take 12 seconds from the front to the trunk. If they run in the same direction, it will take 60 seconds from the front of a to the rear of B until the rear of a exceeds the front of B. assuming that the speed of a and B is constant, calculate the respective speed of the two trains
- 12. In a section of double track railway, two trains pass at the same time, one speed is 20 meters per second, one speed is 24 meters per second, and the length of the train is 180 meters and 160 meters respectively On a section of double track railway, two trains pass by at the same time. The speed of one train is 20 meters per second, the speed of one train is 24 meters per second, and the length of two trains is 180 meters and 160 meters respectively
- 13. On a section of double track, two trains run in the same direction. The speed of train a is 20 meters per second, and that of train B is 24 meters per second. If the total length of train a is 180 meters and that of train B is 160 meters, the time taken for train B to completely exceed that of train a (i.e. wrong train) is 30 minutes___
- 14. On a section of double track, two trains run in the same direction. The speed of train a is 20 meters per second, and that of train B is 24 meters per second The total length of the train is 180 meters, and the time for train B to catch up with train a to completely exceed train a (i.e. wrong train) is calculated Set up equations to do
- 15. How many hard seat tickets do you need to prepare for a full stop train between Beijing and Shanghai at 15 stations?
- 16. If the train from a city to B city has to pass through 12 stations, how many different tickets will a prepare for the train Make it clear why
- 17. On the railway from station a to station B, there are five stations. How many different fares do you need for the train from station a to station B? How many different tickets do you need to prepare?
- 18. There are eight railway stations on a railway. If a passenger car has to stop at each station during the round trip, how many kinds of tickets should the Railway Bureau prepare for this line
- 19. The railway between station a and station B is 1800 km long. At 10:30 pm on September 30, a train runs from station a to station B at a speed of 90 km per hour At 12:00 that night, a train was going from station B to station a at the speed of 95 kilometers per hour. What month, day and hour did the two trains meet
- 20. The railway between station a and station B is 660 kilometers long. At 10:30 in the morning, a train runs from station a to station B at a speed of 90 kilometers per hour, At the same time, there is a train going from station B to station a at the speed of 75 kilometers per hour. How long can the two trains meet