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What is power
Power refers to the amount of work done by an object in a unit time, that is, power is a physical quantity describing the speed of work done
Speed is a physical quantity that represents the speed of an object
Pressure is the physical quantity that shows the effect of pressure gauge
Temperature is a physical quantity that indicates the degree of coldness and hotness of an object
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What is power used to describe
Power refers to the amount of work done by an object in a unit time, that is, power is a physical quantity describing the speed of work done
Speed is a physical quantity that represents the speed of an object
Pressure is the physical quantity that shows the effect of pressure gauge
Temperature is a physical quantity that indicates the degree of coldness and hotness of an object
RELATED INFORMATIONS
- 1. Measurement of physical quantity With a steel tape measure and a piece of chalk, you are not allowed to go through any mathematical calculation, and you are not allowed to open the oil barrel. How can you directly measure the longest straight line distance in the cylindrical closed thin oil barrel?
- 2. 1. In order to compare the power of rope skipping in the class rope skipping competition, which physical quantities must be measured in the activity are as follows:___________ In order to compare the power of rope skipping in the class rope skipping competition, which physical quantities must be measured in the activity are as follows:______________________ ,___________________ ,_____________ The expression of power is_________ . 2. As shown in the figure, it takes 100 seconds for Xiao Ming to ride a bicycle 600 meters in front of a uniform speed on a straight road, from which the speed of the bicycle can be calculated___ Assuming that the resistance of the bicycle is 60N, the power of Xiaoming's work during the journey is______ w. The physical formula used to solve the problem is as follows_________________________________________ Try to deduce the expression of the relationship between power and speed_________________________________________
- 3. Please design an experiment to measure the burning speed of mosquito repellent incense, and write down the required experimental equipment, experimental steps and physical quantities to be measured
- 4. According to the respiratory response of plants, write the respiratory response of human body Hurry up,
- 5. Respiration of green plants (conditions, raw materials, products, places)
- 6. When doing the research experiment of plant respiration, the gas produced can be introduced into () to verify the carbon dioxide produced in respiration
- 7. (2008. The first mock exam in Nankai District) the plant has respiration, except for energy release. A. Starch and oxygen B. water and organics C. water and carbon dioxide D. water and inorganic salts
- 8. The significance of plant respiration
- 9. Is it related to the respiration of plants that "grain should be dried in the sun before entering the warehouse"?
- 10. Why do you drop a drop of water on the slide for onion mounting in the first volume of the seventh grade of human education (what's the purpose of dropping water) but why do you drop normal saline when you do oral epithelium mounting? Why can't you drop water?
- 11. What else can we do with the experimental equipment for measuring the rated power of small bulbs?
- 12. In the experiment of measuring the resistance of small bulb by voltammetry, its experimental principle is as follows: The physical quantities measured in the experiment are () and () In addition to the power supply and small light bulb, the equipment used in the experiment also needs: The calculation formula of the resistance of the small bulb to be measured is as follows: Please draw a short circuit and open circuit diagram, + explain
- 13. Measure the resistance of the small bulb when it works 1. Experiment Name: measure the resistance of small bulb when it works 2. Voltmeter, ammeter, one small light bulb (2.5V, 3.8V), small lamp holder, four No.1 batteries and battery box, sliding rheostat (20 Ω or 50 Ω), "one" - shaped small screwdriver, switch, wire (without iron clip), pencil, ruler 3. Experimental requirements: voltammetric measurement of small bulb dark red, weak light and normal light resistance; complete the experimental report 4. Note: (1) the bulb to be tested is made by the invigilator; (2) The voltage at both ends of the bulb shall not be more than 1.2 times of the marked value 5. Draw the circuit diagram for the experiment 6. Experimental record U / V I / a R / EU 7. What is the relationship between filament resistance and filament temperature?
- 14. How to use the electric energy meter to calculate the electric power The watt hour meter shows "2500r, kW. H, 220 V, 5A". A bulb is connected to the circuit. The meter turns 5 circles in 3 min to find out the energy of the bulb?
- 15. Electric energy meter is used to measure electric power, current, power and voltage which one?
- 16. Is the area of right angled trapezoid related to the median line? Is median line multiplied by height area?
- 17. In △ ABC, the edges of angles a, B and C are a, B and C respectively, if B & # 178; + C & # 178; = A & # 178; + BC, and vector AB, vector AC = 4, Then the area of △ ABC is equal to
- 18. In a triangle, knowing the sine or cosine of two angles, how to find the length of the opposite side and the sine (cosine) of the other angle?
- 19. Let y (x) = arccos ((1-x) / radical 2) and find dy The answer is 1 / radical (1 + 2x-x ^ 2) DX (| x-1)|
- 20. How to explain more thinking and less doing with psychological theory If not, what theory can be used to explain this situation,