物理初二下液体压强题目，求原题解析答案全啊啊谢谢在线等啊

初二物理液体压强题目，急！！~

压强等于压力除以面积。(200+100)/S底=压强10^5pa， 可求出S底，
m水g=200N ，m水=20kg, V水=20L=0.02立方米 注意单位
V水除以S底

No.4 middle School Kunming ,yunnan April 2nd ,2004Dear editor (编辑) ，I live in a beautiful city . Many visitors come to my city . there are so many colorful peacocks (孔雀) here .The peacocks mostly live on the grass land of Dongfeng SquareThey are given food freely by visitors . They usually throw food to them , and don’t think about at all whether the food is right or not . Some of the peacocks became ill , some even died after eating the bad food given by the visitors.I’m sure most of the visitors who throw food to the peacocks really like the birds , but don’t realize (意识到) that they may be doing them harm (伤害).The visitors should be told that what have done is very harmful to the birds , and this kind of thing must be stopped from happening .Perhaps we can build some small shops beside Dongfeng Square to sell peacock food . For us every person , it’s our duty to give more love to these beautiful birds and to look after them carefully. Yours, Sun Yan()6.Many visitors come to the writer’s city to __________. A. do some shopping B. see beautiful peacocks C. play on Dongfeng square D. eat nice food()7.Some peacocks became ill and died because some visitors ______;A. did’t give them any food B. gave them too much foodC. threw them some bad food D. loved them and played with them()8.Some shops can be built beside Dongfeng Square so that they may _____________.A.sell food for visitors B. sell food for peacocksC.make the square more beautiful D.have the beautiful birds()9.From the passage we know people should __________.A. live and play with the birds B. stop the birds from eating too muchC. give right food to the birdsD. give more food to the birds()10.We can guess the writer of the letter, Sun Yan , may be a _____.A. visitor B. shopkeeper C.square keeper D. student6-10：B C B C D
Americans love sports—they love to play them, to watch them on television, and to talk about them. But this hobby sometimes has serious results—at least to the players. For example, when people play tennis, sometimes they hurt their elbow（肘部）and in this way they develop “tennis elbow”. Also it is easy to hurt a knee in a football game. These injuries（损伤）happen while the player is having fun, but they still hurt.　　 A few months ago, Kathleen Simmons, who loves playing volleyball, hurt her knee in a volleyball game. Her doctor told her that she needed a very difficult operation（手术）or she might not be able to play again. She felt very sad and didn’t know what to do.　　 Then Simmons learned about “video operation”. With the help of this new science in medicine, doctors can now repair many injuries and get people back on the playing field and back to their jobs much faster. Simmons found a hospital that was using this new science and went to see the doctor there. The doctors told her the operation could help.　　 For this operation, her doctor didn’t have to open her knee. Instead he put a very small camera lens（镜头）inside her knee. The lens sent back pictures, which appeared on a television screen. As he worked, he could see the inside of her knee on the TV. With the help of the large pictures on the screen, the doctor knew exactly what to do when he was making the repairs.　　 Simmons started walking five days after her operation. “My knee hurt a lot the first few days,” she said. “But I felt better very quickly.” Now, six months after her operation, Simmons can do everything she did before her injury. “It feels like a new knee,” she said. “I can even play volleyball again.”　　 11. Do Americans love sports?　　_____________________________________________　　 12. What sport is Simmons interested in?　　_____________________________________________　　 13. What did the doctor put inside Simmons’ knee?　　_____________________________________________　　 14. What problem may people have when they play sports?　　_____________________________________________　　 15. What’s the advantage（优点）of the new science?　　_____________________________________________　　11. Yes. /Yes, they do.　　 12. Volleyball.　　 13. A camera lens.　　 14. They may get hurt.　　 15. Doctors can do operations more easily and patients can get well more quickly.

（A） In the world ,soccer of football is the most popular sport. This is because many countries have wonderful teams for the World Cup. The World Cup is held every four years. To remember 2002 FIFA World Cup ,children from different countries and more than 60 children from Japanese schools came together and spent three weekends drawing a big picture called “Dream(梦幻) World Cups ”in Japan .The children drew animals, flowers and people playing soccer under a bule bright sky. They wished each football team good luck by drawing the flags(旗帜)of all the countries that will take part in the World Cup in Japan and South Korea.The picture was put up in a park near a playground in Yokohama .Some football teams will have games there. Are you a football fan(迷)？The World Cup makeds more and more people interested in football Teenagers(青少年)like playing and watching football .Many of them love some football stars so much that they get the pictures of their favourite players on the walls of their rooms. That is the way to show their love for the World Cup as children in Japan. 1. If a country wants to take part in the World Cup ,she must have______. A. Many football fans B. a very good team C. many football player D. a big playground 2. The next World Cup will be held in_______. A. 2006 B. 2007 C. 2005 D. 2004 3. From the passage ,in the picture children drew many things except_________. A. people playing football B. pictures of some football stars C. a sunny sky D. flowers 4. In “Dream World Cup”,the children drew the flags of some countries______. A. to show their love for their owe country B. to tell the people their stories C. to show their good wishes for the football teams D. to show their new ideas about football 5.Many teenagers owe the pictures of some football stars because______. A. they are interested in football B. they are football fans C. they think their favourite players are great D. all of A,B and C






















20、①3.528乘以10的四次方 帕斯卡 ② 7.056 牛

亲╭(╯3╰)╮ 不介意的话采纳一下吧

容器的质量为250g，hA=1/2hB=5，上部A为长方形，下部B为正方形，里面盛满酒精，酒精的密度为0.8×10³kg/m³，A的横截面积为40cm²，求：
①容器底部所受的压强和压力
②桌面所受的压强和压力

①
hA=5cm，hB=10cm
所以，B的容积为：Vb＝10×10×10＝1000cm³
A的容积为：Va＝40×5＝200cm³
所以，整个酒精深度为：
h＝hA+hB=10＋5＝15cm＝0.15m
酒精对容器的压强为：
P=ρgh＝800×10×0.15＝1200pa
压力为：F=PS，s＝10×10＝100cm2＝0.01m²
所以：F=1200×0.01＝12N
②
桌面受到的压力为容器、酒精的总重：
m酒精＝ρ酒v总，v总＝1000＋200＝1200cm³＝0.0012m³
所以：m酒精＝800×0.0012＝0.96kg
m总＝0.25＋0.96＝1.21kg
压力为：F＝G总＝1.21×10＝12.1N
压强：P=F/s＝12.1/0.01=1210pa

①P=ρgh 然后用F1=PS 你懂了吧

②F=G=(M容器+M液体)g
P=F/S
现在应该会了

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