Calculation formula of primary school area

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• 1. What's the volume formula for a cone? And the area formula,
• 2. When the volume and the area of the bottom of the cylinder are known, the height can be calculated by the formula______ When the volume and height of the cylinder are known, the area of the bottom can be calculated by the formula______ ．
• 3. Know the volume and height of the cone, and find the formula of the bottom area
• 4. Volume calculation formula of cone Reliable, reliable, reliable
• 5. Significance of sector area calculation formula What is the difference between the two L. R's in the two sector area formulas of pie * r * l and (LR) / 2 I'm so anxious
• 6. Semi arc area formula Known line 4.8, height 0.6, calculate area
• 7. The landing speed of an aircraft is 60m / s, and then decelerates uniformly. When the acceleration is 2m / s ＾ 2, how long does it take for the aircraft to run to the airport The plane stopped safely
• 8. The speed of an airplane is 216KM / h when it lands. After landing, it moves in a straight line with an acceleration of 6m / S ^ 2 The speed of an aircraft when landing is 216KM / h. After landing, it will make a uniform deceleration linear motion with an acceleration of 6m / S ^ 2. (1) the speed when it taxis 225m after landing, and the displacement when it taxis within 12s after landing
• 9. When an aircraft takes off, the speed should reach 216KM / h, and the aircraft starts to taxi with uniform acceleration from standstill. The acceleration is 2m / S2, and the runway of the airport should at least When an aircraft takes off at a speed of 216KM / h, the aircraft begins to taxi with constant acceleration from standstill, and the acceleration is 2m / S2. How long is the runway of the airport at least to take off safely?
• 10. The aircraft takes off at a constant acceleration on the runway. The taxiing time is 20 seconds and the taxiing distance is 1200 meters. The acceleration of the aircraft is calculated
• 11. English translation 5.1 Design Engineering - It is the responsibility of design engineering at each manufacturing facility using material covered by this Standard,to provide the local Trane purchasing department with the current drawing number(s) of the most complex part(s) to be fabricated from this material. 5.2 Purchasing - It is the responsibility of the purchasing department at the manufacturing facility using material covered by this Standard,to include the drawing number(s) provided by design engineering,in the purchase order description for all material ordered.
• 12. English translation Three river toll station of Yidu first class highway construction management office.
• 13. The speed of a car is 50 kilometers per hour. There is a watch that is slow by 2 minutes every 5 hours. If you use the watch, what is the speed of the car? (keep one decimal place)
• 14. When a car runs at a constant speed of 72km / h for 10 min, the consumption of gasoline is 1.2kg. When the car runs at a constant speed, the traction force F = 1200n, the consumption of gasoline is 1.2kg A car runs at a speed of 72km / h for 10 min at a constant speed, and consumes 1.2kg of gasoline. The results show that the traction force F is 1.2x103n and the calorific value Q of gasoline is 4.6 x107j / kg. Q: (1) What is the power consumed by the car during this period (that is, the heat released by the complete combustion of gasoline in one second)? (2) What is the power of the car's traction during this period? (3) Compare the results of (1) and (2), what do you find? Briefly analyze the reasons (write two).
• 15. A brand of new car, at the speed of 20 meters per second on the flat road, consumes 10L of gasoline per 100km. The density of gasoline is known It is the third power of ρ = 0.71 × 10, kg / m3 (1) How long does it take for the car to travel at a constant speed of 100km? (2) What is the mass of gasoline consumed by a car for every 100km?
• 16. The car runs at a speed of 90 km / h for 100 km and consumes 8 liters of gasoline. The car runs at a constant speed of 25 km (1) If the efficiency of automobile is 31.25%, what is the useful work of automobile engine? (2) the useful power of automobile engine The calorific value of gasoline is 32 million J / L
• 17. In the model test of a certain type of car, the speed of 72 km / h is 80 km on a straight road, and the consumption of gasoline is 5 L. assuming that the gasoline is completely burned, the efficiency of the gasoline engine is 40%. 1. How much heat is released by the complete combustion of gasoline during this journey? 2, What's the main impact? 3. What's the useful power of the car in the process of driving at this speed? The heat of gasoline is 4.6 times 10 to the 7th power, no kilogram of glue, and the density of gasoline is 0.8 times 10 to the 3rd power, no cubic meter
• 18. A waterworks decided to build a pumping tower by the river to supply water to a and B reservoirs. Please design a line for it to make the length of the water pipe shortest Before 10 o'clock, it's overdue
• 19. The project team plans to build a 1200 meter long highway. After adopting the new construction scheme, the actual length of the highway built every day is 15 meters longer than the original plan, thus shortening the construction period (1) How many days did it take to build the road? How many days did it take to build the road? (2) How many days has the actual construction period of the road been shortened compared with the original plan?
• 20. (1) How many days did it take to build the road? How many days did it take to build the road? (2) How many days has the actual construction period of the road been shortened compared with the original plan? We need to add and subtract fractions This is the complete title: The project team plans to build a 1200 meter long highway. After adopting the new construction scheme, the actual length of the highway built every day is 15 meters longer than the original plan, thus shortening the construction period