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

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• 1. 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
• 2. 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?
• 3. 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
• 4. Is magnification of microscope line length or area?
• 5. Does the microscope magnify the length or the area? Eyepiece 10x objective 40x And then we zoom in
• 6. Does a microscope magnify length, area, or volume?
• 7. To observe the cell with microscope, is the cell area enlarged or the cell length enlarged? For example, if the magnification of a microscope is 40 times, do you want to enlarge the length 40 times or the area 40 times?
• 8. Why, under a microscope, is magnification the length and width of an object? Not area, volume Under a microscope, what is magnified is length or width. Why not area or volume?
• 9. Ordinary optical microscope is often used in biological experiments. If a small object is magnified 50 times by the microscope, "magnified 50 times" here refers to () A. Volume B. surface area C. image area D. length and width
• 10. Why does the magnification of a microscope not refer to the area of the magnified image?
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• 12. 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
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• 14. Know the volume and height of the cone, and find the formula of the bottom area
• 15. 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______ ．
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• 18. 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.
• 19. English translation Three river toll station of Yidu first class highway construction management office.
• 20. 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)