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A certain section of railway is made up of L-length rails one by one. When a train is moving at a constant speed, a passenger in the train needs to measure the speed of the train. He has measured that the time interval of N consecutive vibrations when the train passes through the rail joint is t, then the relationship V of the speed V is calculated=
This question is too false. In fact, it is impossible to measure the train speed in this way. But after all, the question is a very simple mathematical question. The answer is: v = (n-1) l / T
27. A certain section of railway is made up of L-length rails one by one. A train is moving at a constant speed, and a passenger in the train needs to measure the speed of the train
There were n consecutive vibrations, passing (n-1) tracks,
The length of each rail is l and the distance is (n-1) L
When the time interval is t, the formula v = (n-1) l / T is used to calculate the speed v
A railway is made up of L-length rails one by one. When a train is running at a constant speed, a passenger in the train should measure the speed of the train
He measured that the time interval between N consecutive vibrations of a train passing through a rail joint is t, then the formula v =?
V=(N-1)*L/T
Please tell me the reason. A certain section of railway is made up of tracks of length L one by one. A train is moving at a constant speed, and the train is running at a constant speed
A certain section of railway is made up of tracks of length L one by one. When a train is moving at a constant speed, a passenger in the train has to measure the speed of the train. He has measured that the time interval of N consecutive vibrations when the train passes through the rail joint is t, then the relationship of the speed V is calculated as v = ()
（N-1）L/t
Why does the train take a step back before it starts
Usually, the hooks between the carriages of the train are very tight. If the train is started by direct traction, the traction force must overcome the maximum static friction between the whole train and the rail to start. When the locomotive starts, the traction force is too large and it is difficult to start, It's just to relax the hook between cars, start forward, start cars one by one, and it's much easier for locomotive to start
It takes 26 seconds for the train to pass through a 256 meter long tunnel (i.e. from the front entrance to the rear exit). At this time, it takes 16 seconds for the train to pass through a 96 meter long tunnel. Find the length of the train
Suppose the length of the train is x meters, from the meaning of the question: 256 + X 26 = 96 + x 16, the solution is: x = 160, answer: the length of the train is 160 meters
It takes 25 seconds for a train to pass through a 250 meter tunnel (i.e. from the front entrance to the rear exit). The train passes through a 138 meter long tunnel in 18 seconds. If the train keeps running at a constant speed, the length of the train can be calculated
When you see several such questions, use your mind more. Don't ask others all the time. I won't ask you any more
It takes 80 seconds for a train to pass a 204 meter bridge, and 72 seconds for a train to pass a 172 meter tunnel at the same speed?
And the conductor
Train speed:
（204－172）÷（80－72）
=32÷8
=4 (M / s)
=14.4 km / h
Conductor:
80×4－204
=320－204
=116 (m)
A: the speed of the train is 14.4 kilometers per hour and the length of the train is 116 meters
It takes 25 seconds for a train to pass a 250 meter long tunnel and 23 seconds to pass a 210 meter long tunnel. If the train is connected with another 150 meter long train with a speed of 72 km / h
How many seconds does it take for a train of 72 km / h to pass by
Vehicle speed = (250-210) / (25-23) = 20 m / s
Vehicle length = 20 × 25-250 = 250 (m)
72 km / h = 20 m / S
The time of passing by the wrong train = (150 + 250) / (20 + 20) = 10 (seconds)
It takes 80 seconds for a train to pass a 218 meter bridge and 72 seconds for a train to pass a 170 meter tunnel at the same speed. How many meters per second is the speed of this train?
（218-170）/（80-72）
＝48/8
= 6 m / S
RELATED INFORMATIONS
- 1. It took 50 seconds for a train to pass through a 1140 meter long bridge (from the front of the train to the rear of the train leaving the bridge), and 80 seconds for the train to pass through a 1980 meter long tunnel?
- 2. A train runs at a constant speed through a 500m long tunnel, If it takes 30 seconds for the train to enter the tunnel and leave the tunnel completely, and the time for the whole train to be in the tunnel is 20 seconds, the length of the train can be calculated Using equation
- 3. A train is 200 meters long and has to pass through a 300 meter long tunnel. How many meters does the train travel from the front to the rear of the train?
- 4. Wang Xiaoya was riding on a 200m long train with a speed of 72km / h. from the window, she could see the train running head-on Wang Xiaoya was riding on a 200m long train running at a constant speed of 72km / h. from the window, she saw a 300m long freight train coming in front of her. The passing time was 10s, so she calculated the speed of the freight train
- 5. A train runs at a speed of 72km / h, and there is a tunnel directly in front of it. The train must whistle before entering the tunnel. The driver hears the echo reflected from the cliff at the tunnel entrance after 1.5s. How far is the driver from the tunnel when he hears the echo? (sound speed is 340m / s)
- 6. It takes 20s for a train to pass through a 300m tunnel. The tunnel light shines on the train for 10s. Ask the conductor
- 7. When a train enters a 300m long tunnel, it takes 20s from entering the tunnel to leaving completely. The time for the train to be completely in the tunnel is 10s
- 8. It takes 56 seconds for a train to pass a 240 meter bridge, and 48 seconds for a train to pass a 144 meter tunnel at the same speed There are detailed formulas
- 9. It takes six seconds for a train to pass by a power pole on the side of the road. It takes 46 seconds for a train to cross a 2000 meter long bridge at the same speed. How long is the train
- 10. It took 24 seconds for a train to pass through the first tunnel with a length of 360 meters, and then it took 16 seconds to pass through the second tunnel with a length of 216 meters. This train is facing another train with a length of 75 meters and a speed of 86.4 kilometers per hour. What is the time for the wrong train to cross?
- 11. On the double track railway, there are two fast and slow trains, both 250m long, running in the same direction at the speed of 50km / h and 45km / h respectively How much time do they overtake? Use the system of linear equations with one variable to solve!
- 12. A freight car is running on the straight road at the speed of V1 = 28.8km/h. Due to the wrong scheduling, a passenger car behind it is driving on the same road at the speed of V2 = 72km / h. at the distance of S0 = 600m, the driver of the passenger car immediately stops the truck. In order to avoid collision, at least how much speed should the passenger car speed up?
- 13. A train with a length of 300m crosses the bridge at a speed of 36km / h. It is known that it takes 5min for all trains to pass through the bridge, so the bridge length can be calculated rt
- 14. A 200m long train takes 45s to cross a 700 long bridge. What is the average speed of the train passing the bridge?
- 15. It takes 30 seconds for a train to cross the 430 meter long railway bridge. If the train speed doubles, It took 50 seconds for it to pass the 2180 meter iron bridge, so what's the length of the train
- 16. 4. A 200m long train runs at the speed of 36km / h. It takes 100s to pass through a cave. How many meters is the length of the cave
- 17. How long does a 100 meter long train go through a 500 meter long cave at a speed of 72 km / h? Thank you
- 18. Emergency. The length of the train is 200m, the length of the bridge is 1000m, and the train passes through the bridge at a constant speed Emergency. The length of the train is 200m, the length of the bridge is 1000m, and the train passes through the bridge at a constant speed. (1) the time for the train to pass through the bridge? (2) what is the time for the train to finish at the bridge? (3) the time for the train driver to pass through the bridge? Note: This is a physics problem
- 19. When a train passes a bridge at 2160m per minute, the time for the whole train to be completely on the bridge is 2
- 20. For example, how long does it take for a 300m long train to pass through a 1600m tunnel at a speed of 36km / h? How long does the whole train spend in the tunnel?