When a 1W small bulb lights normally for 1 minute, the power consumption is

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• 1. Scientific calculation in junior high school (electric energy) A common table lamp with adjustable brightness (the bulb is marked with the words "220 V, 25 W") adjusts the brightness of the table lamp through a knob type sliding rheostat. If the power of the table lamp changes between 16 W and 25 W in the process of adjusting the sliding rheostat, then: (1) what is the maximum resistance of the sliding rheostat? (2) how many degrees of power consumption does each table lamp normally work for 2 hours in a month (30 days)? PS：..
• 2. Basic answering process of junior high school physics calculation questions
• 3. Several junior high school calculation problems -1 / 10 by 11 - 1 / 11 by 12 - 1 / 12 by 13. - 1 / 19 by 20 -1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42
• 4. How to solve these problems 1/a+3-6/9-a^2 (a/a-b-b/b-a) ·ab/a+b (1/x+1-x+3/x^2-1)/1/x-1 [2/3a-2/a+b(a+b/3a-a-b)]/a-b/a
• 5. When the correspondent chases from the end of the team to the front of the team, he runs at full speed, which is three times faster than the team. When he returns from the front of the team to the end of the team, he reduces 100 meters per minute. In the process of the team moving forward, the correspondent goes back and forth three times in a row to perform the task, and the time spent on the way is 1 hour in total, among which the time spent on three times to go back and forth to the end of the team is 12 minutes less than the time spent on three times to chase the front of the team, The length of the team is______ ．
• 6. Known to do some work, a to a day to complete, B to B days to complete, how many days to complete the cooperation between the two?
• 7. 1 yuan twice applied question 3 There are 132233 natural villages. 2315 ecological civilized villages were built in 2005. It is planned that the number of ecological civilized villages will reach 24.4% of the total number of natural villages by 2007. According to this plan, what is the average annual growth rate of ecological civilized villages from 2005 to 2007?
• 8. Help me solve the application problem of one yuan twice, fast! A school invested 20000 yuan in laboratory equipment last year, and the total investment is expected to be 120000 yuan this year and next. What is the average growth rate of the investment in laboratory equipment? 2. The profit of a shopping mall in Shanghai is 1 million yuan in July and 1.21 million yuan in September. The profit of B shopping mall in Shanghai is 2 million yuan in July and 2.88 million yuan in September. Which shopping mall has a larger average monthly increase rate It's a process
• 9. Several physics application questions are urgent! 1. The length of an aircraft carrier is 160 meters, and the take-off speed of an aircraft is 40 m / s (1) What is the minimum acceleration for an aircraft to start taxiing at a uniform acceleration on the runway and then take off? (2) If only one aircraft is allowed to taxi on each runway, how many aircraft can take off at most per minute? 2. The normal running speed of the train from station a to station B is 60km / h. once the train started from station a, because it was delayed for 5min, it had to speed up, so that when the average speed was 72km / h, it could just arrive at station B on time, and the movement of the train was set as a straight line (1) What is the normal running time of the train from station a to station B? (2) What is the distance from station a to station B? 3. There are two people, a and B. A is 90m to the south of B. they are moving in a straight line at the same time. A is driving to the east at the speed of 2m / s, and B is driving to the south at the speed of 3m / s. The distance between the two people is calculated after 20s The answers to the questions in the reference book are missing
• 10. Urgent! Ask two high acceleration physics application questions! 1. Party A and Party B start to make uniform acceleration linear motion from the agreed place, in which party a always reaches the end point with the same acceleration, while Party B changes to uniform linear motion after the acceleration reaches the general distance, and Party A and Party B just reach the end point at the same time, what is the acceleration ratio of Party A and Party B? 2. The parachute diver can open the parachute only after leaving the plane for a certain distance from 350m altitude. After the parachute is opened, the parachute diver can decelerate uniformly and move vertically with the acceleration of 2m / S ^ 2, and the speed when reaching the ground is 4m / s. The free falling distance of the parachute diver can be calculated To have a problem-solving process, if you can, please attach a little explanation
• 11. On the physical application of internal energy It is convenient and environment-friendly to use the gas stove. When the general gas stove works normally, it can make 4kg, 23 ℃ water boil in 15 minutes (the boiling point of water in this city is 93 ℃) (1) Heat absorbed by water (2) If the gas stove gives out 65% of the heat Please write down the process of solving the problem, The sixth power of 2936 x10
• 12. Xiao Ming once again used the density of 1.5 * 10 ^ 3kg / m ^ 3 rubber for shipbuilding competition, the volume of rubber he used was 20cm ^ 3, resulting in the maximum displacement volume of the boat is 200cm ^ 3. G = 10N / kg. P water = 1 * 10 ^ 3kg / m ^ 3? Write as many as you know, publicity
• 13. The calculation of physical electric power 1. When the "220 V 40 W" and "220 V 60 W" electric lamps are connected in series in a 220 V circuit, their actual power is calculated 2. With the improvement of people's living standards, refrigerators have entered thousands of households. It is known that the rated power of a household refrigerator is 120W, and the working time of the refrigerator is not continuous. If the total working time of the refrigerator is 6h, how many kilowatt hours of electricity is consumed 3. Resistance R1 = 4 ohm, R2 = 8 ohm in series in the 24 V circuit, at this time, the electrical power of R1? 4. An electric iron needs a certain preheating time before it is used, so people often connect it to the power supply when it is not in use, which not only wastes electricity, but also causes the iron head to be oxidized and not easy to be stained with zinc. Xiao Ming connects an electric iron marked "220 V 55 W" with a bulb (the resistance of the bulb in the preheating state is 495 Ω) to form the circuit diagram as shown in the figure, The soldering iron soon reaches the welding temperature What is the power consumption of electric iron in 1 'preheating state The power consumption of the whole circuit in 2 'preheating state is several percent of that of the electric iron in normal operation ——————Electric soldering iron—— ↑ | 220V ___ Switch__ | ↓ | | | ————- light bulb————
• 14. What's the format of physics calculation questions, What's the format of physics calculation problem? It's better to have an example of arithmetic problem,
• 15. Calculation problem (very simple) When an object with a mass of 0.5 kg falls freely from a high place, what is the work done by gravity on the object in the first two seconds? What's the average power of gravity's contribution to an object in these two seconds? At the end of 2S, what is the instantaneous power of gravity acting on the object? Three questions in total! I hope you can give me the result of the answer (with formula)
• 16. Calculation on power The rated power of the car is p. = 80kW. The resistance of the car is f = 25000n. The mass of the car is m = 2000kg. If the car starts to move in a straight line with uniform acceleration from standstill, the acceleration is a = 1m / S2. When the car reaches the rated power, it keeps the rated power unchanged and continues to drive 1. The maximum speed that the car can reach in the whole driving process The instantaneous power of the vehicle at the end of 2.20s 3. Instantaneous power when the speed of the car is 5m / s 4. Acceleration when the speed of the car is 20m / s If there is a calculation process (with formula), the result should be correct (I have the result of the answer)
• 17. Basic calculation of electric power After connecting "6V 3W" bulb L1 and "6V 2W" bulb L2 in series into 6V circuit, what is the actual electric power of L1?
• 18. Urgent: a physics calculation problem in senior one The buoyancy of a hydrogen balloon is 5N and it rises at a constant speed. Suddenly, an object with a mass of 100g originally tied to the balloon falls off from the balloon. If the air resistance is not considered and the buoyancy of the balloon remains unchanged, the acceleration of the balloon rising after the object falls off is calculated
• 19. When grinding metal, the high temperature generated by friction between the grinding wheel and metal debris forms Mars. What direction do you notice Mars flying? If the radius of the grinding wheel is 10cm and the speed is 1080r / min, what is the speed of Mars just flying out? What is the angular velocity of the particle with a radius of 5cm on the grinding wheel?
• 20. 2 application questions of physical pressure! In a hydropower station, the height of the dam is 105m. When the water depth in the dam is 70m, what is the water pressure at 20m away from the dam bottom