![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
A vehicle weight 5T, rated power 80kW, acceleration a = 1m / S2 for uniform acceleration linear motion, the resistance of the vehicle is 0.06 times of the vehicle weight, G take 10m / S2, calculate, 1. Analyze the change of traction and engine power during the process of constant acceleration from static to constant speed 2. How long can the car maintain a uniform acceleration linear motion 3. The average power of the car in the process of uniformly accelerating linear motion 4. Instantaneous power at the end of 10s acceleration 5. Maximum speed
1. From f-f = ma, f = P / V, when the power does not reach the rated power,
Traction force F = ma + F = 5000kg × 10m / S & # 178; + 0.06 × 50000n = 8000n, is a fixed value;
When the power reaches the rated power, the traction decreases with the increase of speed
The engine power increases gradually from 0 to rated power
2. When the engine's traction force F equals to the resistance, the car starts to move at a constant speed, and the speed reaches the maximum value
The resistance of the vehicle is 0.06 times of the vehicle weight, and the vehicle weight is 5000kg × 10m / s and 178; = 50000n,
The resistance of the vehicle is f = 0.06 × 50000n = 3000n,
V=P/F=P/f=80000/3000=80/3≈26.67m/s
From v = v. + at, V. = 0m / s, time t = V / a = 80 / 3S ≈ 26.67s
3. Displacement S = v.t + 0.5at & # 178; = 1600 / 9 ≈ 177.78m,
Average power P = w / T = FS / T = = (MA + F) s / T = (8000 * 1600 / 9) / (80 / 3) = 160000 / 3W = 160 / 3kw ≈ 53.33kw;
4. P = FV, f = 8000n, v = P / F = 5000W / 8000n = 5 / 8m / s
RELATED INFORMATIONS
- 1. When a vehicle with a mass of 5t starts from a standstill and runs along a straight road with an acceleration of 1m / S2, the resistance of the vehicle is known to be 1000N. What is the traction force of the vehicle? What is the power of the car at the end of 10s? How much work does the external force do to the car during this period?
- 2. The car starts to move in a straight line with uniform acceleration from standstill, the acceleration is 0.1, and the path is a and B points 150m apart, sharing 10s What is the speed of the tram passing through point a and point B?
- 3. The length of the bridge is 150m. The time of the whole train passing through the bridge is calculated as follows: (1) the time of the whole train passing through the bridge. (2) the time of the whole train passing through the bridge
- 4. The weight of a vehicle is 5T, the rated power is 80kW, the acceleration a = 1m / S2 is used for uniform acceleration linear motion, the resistance of the vehicle is 0.06 times of the vehicle weight, G is taken as 10m / S2 To find the average power of the car in the process of uniformly accelerating linear motion
- 5. A 5T car, the rated power of the engine is 80kW, the car from static start to acceleration of 1 meter per second to do uniform acceleration linear motion, the car resistance It is 0.06 times of the vehicle weight, G is taken as 10, and the maximum time for the vehicle to make a uniform acceleration straight line? The instantaneous power at the end of 5S and 15 seconds after the vehicle starts to move?
- 6. The rated power of automobile engine is 80kW, the mass is 5T, the resistance is 0.1 times of the vehicle weight, and the acceleration at the speed of 10m / s
- 7. The object moves in a straight line with a uniform velocity of 5 m / s. The displacement in the third second is 2.5 m, and the acceleration of the object is the process of explanation and calculation
- 8. An object starts from 1 m / s and rises for 3 s with uniform acceleration a, and the velocity reaches 4 m / s (1) Acceleration a of uniform acceleration rise (2) Height of rise H
- 9. An object makes a uniform zero acceleration linear motion with an initial velocity of 2m / s and an acceleration of 1m / S ^ 2. Find 1. The velocity of the object at the end of 3S. 2. The object moves in the first 4S 2. The displacement of the object in the first four seconds 3. Average speed in 4S 4. The displacement of the object when the speed reaches 8m / s Ask 1.3 questions
- 10. When a car moves at a constant acceleration of 0.5m/s2, passing through two points AB 125m apart for 10s, the speed of the car after passing through point a for 5S is 0.5m/s2
- 11. The motorcycle starts from standstill, runs for a distance with the acceleration of A1 = 1m / S2, then makes a constant speed movement, and then makes a constant deceleration movement with the acceleration of A2 = - 4m / S2 until it stops. The motorcycle has walked 1440m in total and lasted for 100s. The maximum speed of the motorcycle in this process is calculated
- 12. A particle starts to move in a straight line from its rest. In the first second, it moves at an acceleration of a = 1 m / S & sup2; in the second second, it moves at an acceleration of a '= - 1, and in the third, it moves at an acceleration of a = 1 m / S & sup2 =What is the total displacement of this particle after 100 s of repeated acceleration in the fourth second?
- 13. A particle starts to move from rest with an acceleration of 1 m / S2. Some people say that its velocity at the end of the first second is 1 m / s and that at the end of the second is 2 m / s. therefore, its displacement in the first second is 1 m and that in the second is 2 M. do you think that's right? Why?
- 14. When the particle moves along a straight line, its acceleration is a = 2-3T (SI). If t = 2S, the particle is located at x = 1m, v = 2m / s, find 1, the velocity of the particle; 2. The equation of motion of a particle
- 15. When someone goes from a to B, he moves at a speed of 2km per hour. He advances one meter, then retreats two meters, then advances three meters, retreats four meters Q: Someone goes from a to B at a speed of 2km per hour. He advances one meter and then retreats two meters. He advances three meters and retreats four meters. How far is he from a after 10 minutes
- 16. A maintenance team took a car along the road maintenance line, agreed to forward as positive, backward as negative, one day from the o to the end of work The route (unit: km) is + 10, - 3, + 4, + 2, - 8, + 13, - 2, + 12, + 8, + 5 (1) How far is the closing time from o? (2) If the fuel consumption per kilometer is 0.2 liter, how much is the total fuel consumption from O to the end of work? Formula
- 17. The forward and backward trajectory of a car with full wheels Is the track of forward and backward motion the same circle when the car is full of wheels to the left,
- 18. When the car moves forward or backward, turn the steering wheel to the left or right, and the direction of the front and rear of the car is the same or the opposite
- 19. Motor vehicle D is forward, what is backward
- 20. (1 / 2) the car starts to move at an acceleration of 1 meter every second. At 20 meters behind the car, while the car starts to move, someone starts to ride a bicycle at the same time (1 / 2) the car starts to move forward at an acceleration of 1 meter per second. 20 meters behind the car, while the car starts to move, someone starts to chase the car at a constant speed of 6 meters per second. Can he catch up with the car (1 / 2) the car is driving at the speed of 18 meters per second. When the driver suddenly finds an obstacle in front of him, he brakes immediately. Assuming that the acceleration is 3 meters per second after braking, he decelerates evenly, and calculates the sliding distance of the car in 10 seconds (2 / 2)?