Junior high school physics competition test questions

Introduction Junior high school physics competition test questions "Du Chunyu | Junior high school physics competition practice questions distributed | 3 "Challenge physics competition questions with Lao Du" first semester of the first semester of the first semeste

Junior high school physics competition test questions

"Du Chunyu | High school physics competition practical questions distributed | 3 "Challenge physics competition questions with Lao Du" first semester of third grade" Baidu network disk resources free download

Link: https://pan.baidu.com/s/1uu5lNL4wkKVVHPDd-upUnw

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Du Chunyu|Practice questions for the high school physics competition (gift)|3 "Physics Challenge Questions Competition with Lao Du"- - First semester of the third year of middle school | 2 "Challenge physics competition questions with Lao Du" - Second semester of the second year of high school | 1 "Challenge Physics Competition Questions with Lao Du" Du" - First Semester of Second Year of Middle School | Course 8 Special Topic 8: Density Calculation - Density Measurement Problems | Course 7 Topic 7: Density Calculation - Sparse Problem | Course 6 Topic: Light Refraction and Imaging by Convex Lenses |5 of Conference 5: Light reflection and imaging by plane mirrors | Theme 4 of Conference 4: Temperature and changes in the state of matter Theme 3 of Conference 3: Acoustic phenomena Echo speed of sound | Lesson 2 Remedial Problems Average Speed ​​| Lesson 1 Topic 1 Mechanical Movement Problem Crossing Bridge Encounter Problem | Topic 1 Mechanical Motion Bridge Crossing Problem Encounter Problem.pdf (4) Topic 1: Mechanical Motion Bridge Crossing Problem, Encounter Problem Example 8-Example 9.flv

1. Use a traditional wind-up alarm clock instead of an electronic clock, which can reduce carbon dioxide emissions by about 48 grams per day.

2. Using traditional toothbrushes instead of electric toothbrushes can reduce carbon dioxide emissions by 48 grams per day.

3. Change a 45-minute exercise toan electric treadmill jogging in a nearby park can reduce carbon dioxide emissions by almost 1,000 grams.

4. If you are traveling to a place 8 kilometers away

, taking rail transportation can reduce carbon dioxide emissions by 1,700 grams compared to taking a car .

5. Instead of wringing clothes in a washing machine, let them dry naturally, which can reduce carbon dioxide emissions by 2,300 grams.

6. Turn off computers and monitors during lunch breaks and after leaving work. In addition to saving electricity, this can reduce carbon dioxide emissions from these devices by a third.

7. Switching to a water-efficient shower head can not only save water, but also cut in half the carbon dioxide emissions caused by a three-minute hot shower.

1. Do more exerciseice, watch less television, surf the Internet less, get together more with family and friends and go out for walks more often.

2. Try to eat green foods, drink more water, less alcohol and carbonated drinks, and avoid junk foods like foods high in fat and sugar as much as possible.

3. Use energy-saving lamps instead of incandescent lamps. The power (power) should be as low as possible, which is sufficient for lighting. Additionally, lower lighting in the room will make it more romantic and interesting.

4. When going out at short distances, try to use non-motorized vehicles (on foot or by bicycle)

5. Do not litter or classify waste.

6. Do not turn on the lights or use the air conditioner when no one is present or when it is not necessary.

7. Open more windows forbetter ventilation and turn off the lights easily. Turn off the faucet, gas stove, television, air conditioner and computer.

8. Prepare a large bucket at home for the water used for washing vegetables and fruits. water flowers, flush toilets and use them as domestic wastewater.

9. When cooking rice, you can soak the rice in water for a while before cooking it. You don't need a pressure cooker to soak mung beans in a boiling thermos. water in the evening and you can have a delicious drink in the morning.

10. It is best to turn off your cell phones at night, one to save energy and the other to help you rest, except in an emergency of course.

11. Some wrapping paper and promotional paper are blank on the back and can be used as notes or scrap paper

12. Use the refrigeratore rationally and defrost it regularly. Computers, TVs and stereos go into sleep mode to save energy when people leave temporarily and turn off directly when not in use.

13. When purchasing products, do not blindly pursue high-end products. Practical and cost-effective products are good products and avoid waste.

14. If possible, do not turn on the air conditioner. Use an electric fan or fan whenever possible. If you know how to wash clothes by hand, try not to use a washing machine. /p>

15. Put the water in the toilet bucket. Place a large Coke bottle filled with water to reduce the amount of water stored. It is best to design two switches, one for flushing stool and the other for flushing urine.

16. Make full use of natural energy such as solar water heaters et wind energy production. Take the stairs whenever possible without taking the elevator, which can save energy and exercise.

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