![](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 car with a mass of 0.8 * 103 cubic kg drives at a constant speed of 72 km / h on a straight road, The resistance of the car is one tenth of that of gravity, 10 N / kg per gram Ask: 1) the distance the car has traveled in 5 minutes 2) Work done by car traction in 5 minutes
(1) Five minutes' journey by car
72km*（1/12）=6km
The work done in 5min by the traction of a car
Let g = 10
mg=8x10
1. The density of sand is 1.3 kg / m ^ 3, and the thickness of sand layer is 5mm. If the car transports 1.5 tons of sand each time, how many m ^ 2 can a car pave the road? 2. Oil tank truck is used to transport crude oil, and the volume of each tank truck is 40 m ^ 3. How many cars are needed to transport 400 tons of crude oil? (oil density: 0.88? ^ 3 kg / m ^ 3) the more detailed, the better,
1.1.5t = 1500kg v = m / density = 1500kg / 1.5 * 10 ^ 3kg / m ^ 3 = 1m ^ 3 1m ^ 3 = 10 ^ 6mm ^ 3 10 ^ 6mm ^ 3 / 5mm = 2 * 10 ^ 5mm ^ 2 = 20m ^ 2.400t = 400000kg v = m / density = 400000kg / 0.88? ^ 3 kg / m ^ 3 = 454.5m ^ 3 454.5/40 = 11.3625 = 12
How many tankers are needed to transport 900t crude oil with the capacity of 50m and 179; for transporting crude oil with the density of 0.9x10 and 179; kg / M and 179; by tankers
1. Volume of 900t oil: v = 900 / 0.9 = 1000m3
2. Oil tank required: 1000 / 50 = 20 knots
RELATED INFORMATIONS
- 1. The crude oil with density of 0.9 × 10 ~ (- 179) kg / M ~ (- 179) is transported by oil tanker, and the volume of each oil tanker is 50m ~ (- 179);, How many tankers are needed to transport crude oil with density of 0.9 × 10 ~ (- 179); kg / M ~ (- 179); and the volume of each tanker is 50m ~ (- 179); to transport 900t crude oil?
- 2. The capacity of each tank truck is 50m. How many tank trucks are needed to transport 800t oil with density of 0.8 × 10 kg / M?
- 3. A. B. the distance between the two places is 120 km, and the expenses for both the automobile company and the railway company to start transportation business are shown in the table below [unit: yuan / (t · km)] The cost of one kilometer per ton of goods Freight of means of transport [yuan / (t · km)] toll (yuan) handling and management fee (yuan) Car 2 200 0 Train 1.8 0 1400 A customer has a batch of goods to be transported from place a to place B. according to the quality of the goods transported, railway freight transportation costs less. Do you know how many tons the quality of the goods is above?
- 4. A wholesaler wants to consign a batch of aquatic products from a to B for sale, It is known that the distance between a and B is 120km, the average speed of freight vehicles is 60km / h, and the average speed of freight vehicles is 60km / h The charging items and standards of the transport company are as follows: Unit price of transportation unit price of refrigeration unit price of road and Bridge toll 2 5 200 (1) If the wholesaler has x T aquatic products to transport, the total charge of the freight company is y yuan. Try to write the function expression between Y and X (2) If the wholesaler wants to deliver 5T aquatic products and pays the freight of 1400 yuan, is the shipping company willing to deliver these aquatic products? No one answered
- 5. A pile of steel was transported by one car. Five times on the first day, 50.5% of this batch of steel was transported. The next day, another time was transported by the same car There are 3.94 tons left. How many tons of steel are there in this pile?
- 6. There is a batch of coal that was originally planned to be transported by eight vehicles. In actual transportation, there are two vehicles less than the original plan. In this way, each vehicle carries an average of 2.5 tons more than the original plan How many tons of coal are there? Please answer Thank you!
- 7. Xiao Ming's father is in the coal business. Now he is going to rent a car to faint 62 tons of coal from Yancheng to Sheyang. The big truck of Yancheng transportation company transports 10 tons each time, and the freight is 200 yuan. The small truck transports 4 tons each time, and the freight is 95 yuan. Can you help Xiao Ming's father design the most cost-effective plan, how many cars should be used, and how much is the freight?
- 8. At the construction site, 75 tons of sand are transported by large and small trucks with a load of 8 tons and 5 tons, and several large trucks and small trucks are used respectively fast
- 9. The density of oxygen in an oxygen cylinder of a hospital is 6kg / M and 179; when 1 / 3 mass of oxygen in the cylinder is used, the density of gas in the cylinder is 0 A. 6 kg / M; b.4 kg / M; C.2 kg / M; D. can't be sure, please tell me how to solve the problem
- 10. To transport a pile of sand, we transported two thirds of the total in the first time and one fourth of the total in the second time. We transported 20 tons more in the first time than in the second time. How many tons are there in this pile
- 11. A vehicle with a weight of 5 × 10 quartic power n drives at a speed of 36 km / h on a straight road for 3 km at a uniform speed, If the engine power of the car is 30kW during this journey, the (2) The size of the resistance of a car in motion
- 12. When a car runs at a constant speed of 72km / h, the traction power of the car is 6 times 10 small 4W, and the car runs at a constant speed of 2000m at this speed to get the traction power
- 13. When the car is running at a speed of 60km / h on the horizontal road at a constant speed, the resistance is 2000N, so what is the traction force? Let's say the answer directly
- 14. When a car is running at a constant speed, the engine traction is 2000 N and the speed is 108 km / h. The resistance of the car is calculated
- 15. When a car with a mass of 2T moves in a straight line along a horizontal highway, the traction force on the car is 2000N and the resistance is 0.01 times of the weight of the car. The resultant force on the car is calculated. (G is 10N / kg)
- 16. When a car runs at a constant speed on a horizontal highway, its power is 80kW and its resistance is 5x10 ^ 3N
- 17. Xiaoming pushes the car with a force of 10 N and a force of 50 N on the horizontal ground at a constant speed in a straight line, then (1) the friction force received by the car is n, (2) The car is supported by cattle
- 18. What's the power of a man's work on the car
- 19. If the horizontal force of 20n is used to pull the object with 60N on the horizontal ground, the object can move at a uniform speed. If the horizontal force of 15N is used to pull the object, the friction force on the object is————
- 20. When someone pushes a car with a weight of 500 cattle and advances at a constant speed of 10 meters on the uneven horizontal ground, what work does he do A 5 * 10 cubic coke B 500 joules C 0 coke D condition is not enough to calculate