![](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>)
There are 15 trucks with a load of 2 tons and 4 tons, which can transport 54 tons of yellow sand at one time. How to reasonably arrange these two trucks with different load capacities
Suppose there are 15 4-ton trucks, which can transport 60 tons. If you change a 2-ton truck, it will be less than 2 tons, so there are (60-54) / 2 = 3 2-ton trucks
There are 12 4 ton trucks and 3 2 ton trucks
There is a car on the construction site to transport yellow sand, which has already transported 18.6 tons. The remaining yellow sand is 4.8 times more than half of the original total
There is a car carrying yellow sand on the construction site, and 18.6 tons have been carried away. The remaining yellow sand is 4.8 tons more than half of the original total. How many tons of yellow sand are there on the construction site?
There are six trucks with the same load carrying Huangsha in the construction site, 120 tons of cloud per day. If 180 tons per day, how many trucks are needed
Truck = 180 △ 120 × 6 = 9
A kind of cuboid brick with thickness of 8cm and density of 2.4 × 103kg / m3 is used to build the wall. The density of cement mortar used for building the wall is 2.2 × 103kg / m3, and the thickness of cement mortar between brick joints is 1cm, as shown in the figure. In order to ensure safety, the pressure of the wall on the wall base shall not exceed 4.9 × 105Pa, then the height of the wall shall not exceed 4.5 × 105Pa______ m. (excluding atmospheric pressure, G is 10N / kg)
The pressure of the wall to the horizontal ground: P = FS = GS = MGS = ρ VGS = ρ SHGs = ρ GH, the maximum height of the wall is h, ∵ the thickness of the brick is 8cm, the thickness of the cement mortar between the brick joints is 1cm, ∵ the total height of the brick is H1 = 89h, the height of the cement mortar is h2 = 19h, ∵ the pressure of the wall to the wall base shall not exceed 4.9 × 105Pa, ∵ ρ 1g
RELATED INFORMATIONS
- 1. Volume x density = weight, what is the density?
- 2. The unit price consists of 1:2 cement mortar and 1:3 cement mortar,
- 3. A 75kW car runs at a constant speed on a straight road at a speed of 20m / s to find the traction force of the car? If the power remains the same, the car needs 7500n traction when climbing,
- 4. The resistance of a bicycle running at normal speed on a straight road is 0.02 times of the total weight of the vehicle and the person. Which of the following values is the closest to judge the power of a cyclist? Which one should be chosen for 1000W, 100W, 10W, 1W? Why? (please write down the basis or calculation process)
- 5. The resistance of bicycles running at normal speed on straight roads is about 0.02 times of the total weight of bicycles and people, and the power of cyclists is the closest to () A. 10WB. 100WC. 1 kWD. 10 kW
- 6. The vehicle with mass m runs on the straight road with constant power P, and the constant speed of the vehicle is v. when the speed of the vehicle is V2, the acceleration of the vehicle is large P/mv1 B,P/mv2 C,P(v1-v2)/mv1v2 D,pv1v2/m(v1v2) What to choose Why?
- 7. The engine power of the car is 80kW and the resistance is 2000N Find (1) the work done by the engine in 10 seconds; (2) The distance that the car passes in 10 seconds
- 8. The friction resistance of a truck with a mass of 8t is 0.02 times of the weight of the truck when driving at a constant speed on a horizontal highway. How much traction is the engine on the truck when the truck is running?
- 9. The rated power of a car with a mass of 10t is 60kW, and the maximum speed of driving on the horizontal road is 15m / s. if the motion resistance of the car remains unchanged, the motion resistance of the car is______ N. Acceleration at rated power when vehicle speed is 10m / S______ m/s2．
- 10. A car drove 18 km at a constant speed on a straight highway. The speed of the car is shown in the figure. The engine power of the car is 50 kW, The size of the car's resistance, the work done by the car's engine
- 11. A batch of cars can carry several tons of goods. If each car carries 3.5 tons, there will be 2 tons more. If each car carries 4 tons, there will be another ton How many tons are there in this shipment?
- 12. If each truck carries 3.5 tons of goods, I can't transport two tons of the goods. If each truck carries four tons of goods, one ton of the goods can be loaded after loading the goods. How many tons of these goods are there in total?
- 13. To support Sichuan earthquake relief, the cross will transport 160 tons of relief goods to the disaster area In order to support the earthquake relief in Sichuan, the cross society has to transport 160 tons of relief goods to the disaster area for no more than 12 days. There are two kinds of cars to rent, the freight of type A is 30 yuan per ton, and that of type B is 25 yuan per ton. The transportation capacity is 16 tons per day for type A and 12 tons per day for type B, but only one kind of car can be rented every day. Due to the long distance, no car runs once a day There are three kinds of renting schemes: 1. Renting only type A; 2. Renting only type B; 3. Renting type A for a period of time, then forming type B for a period of time, just 12 days to complete If you are the person in charge of the cross society, which one will you choose (considering the freight) and explain the reason
- 14. There are two kinds of chemical fertilizers in the warehouse, one is 120 tons, and the other is 90 tons. How many times can they be transported by two trucks with carrying capacity of 8 tons and 6 tons respectively? 120÷8+90÷6 （120+90）÷（8+6） =15+15 =210÷14 =30 (Times) = 15 (Times)
- 15. There are 32 tons of goods at the wharf. After six times of transportation with X tons of carrying capacity, there are still 5 tons left. Write the equivalent relation and list the equation It's urgent! Today's homework
- 16. How many cars are there? How many tons are there in this batch of goods
- 17. A train loaded a batch of goods. Originally, 36 tons of energy-saving goods were loaded, but 80 tons were not loaded. Later, 4 tons more were loaded in each car, As a result, after loading the goods, there are just two carriages left. How many carriages does this train have? How many tons does this batch of goods have?
- 18. The first batch of 360 tons of chemical fertilizer transported to a certain place requires 6 trains plus 15 cars, and the second batch of 440 tons requires 8 trains plus 10 cars. How many tons are loaded into each train skin and each car on average
- 19. It transported 360 tons of goods, loaded 6 train cars and 15 cars; transported 440 tons of goods, loaded 8 train cars and 10 cars. How many tons of goods were loaded in each train car and each car?
- 20. At 7:49 a.m. on April 14, 2010, Yushu County, Qinghai province suffered a 7.1 magnitude earthquake. After receiving the production task, a tent production enterprise increased production investment and improved production efficiency. In fact, it produced 200 more tents per day than the original plan. It is known that the time used to produce 3000 tents is the same as that used to produce 2000 tents per day How many tents can be produced?