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| 2017/06/17 07:52:21瀏覽65｜回應0｜推薦0 | |
| 標題: Suggest 20 questions about science in the simple life!
此文章來自奇摩知識+如有不便請留言告知 發問:Can u Suggest 20 questions about science in the simple life? I want the questions not so easy ,,but not so much diffcult !!! THX FOR HELP!! Please provide the answer also........... 最佳解答: 1. Why the temperture range of the costal area isn't very wide? Ans: Since the specific heat capacity of the water is higher than the land. Therefore, the temperature range of the costal area will not be very wide. 2. What is the use of fat in our body? Ans: It is to store the energy in our and body keep us warm . 3. Which has the higher density? Brine (鹽水) or water. Ans: Brine 4. Which has the higher potential energy? The man on the top of the mountain of on the land? Ans: The man on the top of the mountain. 5. Why should we wear clothes in dark colour in winter? Ans: Since dark colour is good radiation absorber. Therefore, dark clothes can absorb more heat due to radiation. Hence, we can feel warmer when wear dark clothes in summer. 6. Why can we looked our face through the mirror? Ans: It is because the light rays comes from the mirror can reflect into our eyes. Therefore, we can see the image of our face. 7. Why should we put the air-conditioner at the top of the room instead of put it at the bottom of the room? Ans: It is because the cold air will go downwards. If we don't put the air-conditioner at the top of the room. We can't have a better cooling result. Therfore, we should put the air-conditioner at the top of the room so that we can have better cooling. 8. How do we called the procedure that the matter changed from solid to gas? Ans: Sublimation 9. What is the energy change of a electrical toy train (with dry cell)? Ans: Chemical energy→electrical energy→kinetic energy 10. What is the energy change of a roller coaster going from the top to the bottom? Ans: Electrical energy→kinetic energy→potential energy→kinetic energy 11. What is the meaning of 'Newton's Third Law'? Ans: Every action force are always in a pair of forces called action and reaction. 12. How is the speed of the light rays when it is travelling in the water compared with travelling in the air? Ans: Slower in water. 13. Why can a ship made by steel can float in the water although the steelhave larger density than water? Ans: It is because the density of the steel ship contains a lot of air which has lower density than a steel block. Therfore, the overall density of the ship is lower than the water and hence it can float on the water. 14. Why shouldn't we use an acid to clean the floor which is made by marble? Ans: Since marble is made up of calcium carbonate, all carbonates will dissolve in acid to form carbon dioxide. In other words, the acid will corrode the marble. Therefore, we shouldn't use acid to clean the marble floor. 15. How is acid rain formed? Ans: Some pollutants such as nitrogen oxide and sulphur dioxide are water-soluble acidic gas. They are produced from the factories and vehicles and rise. They will dissolve in the water droplets in the clouds and let the water droplets become acidic. The acidic water droplets will become acid rain in raining. 16. Why should we put a fuse or circuit breker in the circuit? Ans: To prevent accidents cause by short circuit. 17. Why we can see an orange flame when we burn coal? Ans: It is because of the carbon ions in the coal? 18. Is the image caused by the mirror is real? Why? Ans: No. It is becaus there is no actual light rays come from the image. 19. What is the properties of the image caused by hand lens (放大鏡)? Ans: Virtual, erect and magnified 20. What is the properties of the image of the object in the water (look on the land)? Ans: Virtual, erect and the size of the image not change 其他解答: |
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