初二物理计算题十道谢谢 十道物理初二固体压强计算题带答案，十道物理初二液体压强计算题...
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No.4 middle School Kunming ,yunnan April 2nd ,2004Dear editor (\u7f16\u8f91) \uff0cI live in a beautiful city . Many visitors come to my city . there are so many colorful peacocks (\u5b54\u96c0) 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\u2019t 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\u2019m sure most of the visitors who throw food to the peacocks really like the birds , but don\u2019t realize (\u610f\u8bc6\u5230) that they may be doing them harm (\u4f24\u5bb3).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\u2019s 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\u2019s 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\u2019t 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\uff1aB C B C D
Americans love sports\u2014they love to play them, to watch them on television, and to talk about them. But this hobby sometimes has serious results\u2014at least to the players. For example, when people play tennis, sometimes they hurt their elbow\uff08\u8098\u90e8\uff09and in this way they develop \u201ctennis elbow\u201d. Also it is easy to hurt a knee in a football game. These injuries\uff08\u635f\u4f24\uff09happen while the player is having fun, but they still hurt.\u3000\u3000 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\uff08\u624b\u672f\uff09or she might not be able to play again. She felt very sad and didn\u2019t know what to do.\u3000\u3000 Then Simmons learned about \u201cvideo operation\u201d. 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.\u3000\u3000 For this operation, her doctor didn\u2019t have to open her knee. Instead he put a very small camera lens\uff08\u955c\u5934\uff09inside 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.\u3000\u3000 Simmons started walking five days after her operation. \u201cMy knee hurt a lot the first few days,\u201d she said. \u201cBut I felt better very quickly.\u201d Now, six months after her operation, Simmons can do everything she did before her injury. \u201cIt feels like a new knee,\u201d she said. \u201cI can even play volleyball again.\u201d\u3000\u3000 11. Do Americans love sports?\u3000\u3000_____________________________________________\u3000\u3000 12. What sport is Simmons interested in?\u3000\u3000_____________________________________________\u3000\u3000 13. What did the doctor put inside Simmons\u2019 knee?\u3000\u3000_____________________________________________\u3000\u3000 14. What problem may people have when they play sports?\u3000\u3000_____________________________________________\u3000\u3000 15. What\u2019s the advantage\uff08\u4f18\u70b9\uff09of the new science?\u3000\u3000_____________________________________________\u3000\u300011. Yes. /Yes, they do.\u3000\u3000 12. Volleyball.\u3000\u3000 13. A camera lens.\u3000\u3000 14. They may get hurt.\u3000\u3000 15. Doctors can do operations more easily and patients can get well more quickly.
\uff08A\uff09 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 \u201cDream(\u68a6\u5e7b) World Cups \u201din 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(\u65d7\u5e1c)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(\u8ff7)\uff1fThe World Cup makeds more and more people interested in football Teenagers(\u9752\u5c11\u5e74)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 \u201cDream World Cup\u201d,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
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1．把电阻R1 =3 、R2 = 6 接入同一电路，关于它们的总电阻（等效电阻）值，下列四个选项中，不可能的是：（ ）
A．9 B．2 C．9 或2 D．3
R1
I1
I2
I
U
R22．如图，下列四个等式中，符合并联电路特点的是：（ ）
A．I = I1﹢I2
B．U = U1﹢U2
C．R = R1﹢R2
D．
3．如图3所示，电源电压保持不变。当开关S1 合、S2断开时，电流表的示数为0.2A；当开关S1、S2都闭合时，电流表的示数为O.8A。则电阻R1与R2的比值为（ ）
A 、1:3
B、 3：l
C、 2:3
D 、3：2
4．如图18所示的电路中，当开关S闭合，甲、乙两表为电压表时，两表读数之比U甲：U乙为3:1当开关S断开，甲、乙两表为电流表时，两表的读数之比I甲：I乙为（ ）
A．2:1 B．2:3 C．3:1 C．3:2
图10
5．如图1O所示电路，电源电压保持不变，电阻R1=5Ω， R2=15Ω．
(1) 若开关Sl、S2都断开时，电流表示数为O.2A，则电源电压是是多少？
(2) 若开关Sl、S2都闭合时，电流表示数为O.9A，则通过电阻R3的电流是多少？
A
V
S
R1
R2
6．一次实验中，郝奇同学连接了如图所示的电路，电源电压为6V且保持不变，电阻R1=8Ω，滑动变阻器R2的最大阻值为10Ω。他所选用的电压表量程为0～3V，电流表量程为0～0.6A。为了保证电路安全，实验中滑动变阻器接入电路的阻值范围是( )A．0～2Ω B．0～8ΩC．2Ω～8Ω D．8Ω～10Ω
7．A、B是同种材料制成的电阻，它们的长度相等，A的横截面积是B的两倍，将它们串联在电路中，则加在A、B上的电压UA、UB和通过A、B的电流IA、IB间的关系正确的是（ ）
A． IA=IB B． IA >IB
C． UA=UB D． UA>UB
8．两个定值电阻，甲标有“16Ω 1.5A”，乙标有“22Ω 0.5A”。现把它们串联起来，则该串联电路两端允许加的最高电压是( )
A、57V B、41V C、35V D、19V
9．如图所示，滑动变阻器的滑片在某两点间移动时，电流表的示数范围为1A到2A之间，电压表的示数范围为6V到9V之间，则定值电阻R的
阻值及电源电压分别为：（ ）
A、3Ω，15V B、6Ω，15V
C、3Ω，12V D、6Ω，12V
10．如图所示电路中，电源电压为3V且保持不变，R=10Ω，滑动变阻器的最大
阻值R′=20Ω．当开关S闭合后，在将滑动变阻器的滑片由A端移动到B端的过程中，
电流表示数的变化是由
A．0.3 A～0.1 A B．0 A～0.1 A C．0.1 A～0.3 A D．0.3 A～0 A
11．两定值电阻甲、乙中的电流与电压关系如图所示，甲的电阻为 Ω；将甲和乙并联后接在电压为2.0V的电源两端，干路中的电流为 A.
12．如图所示，R0为定值电阻，电源电压恒定。闭合开关，当滑动变阻器接入电路的电阻值为R/4压表的示数为6V；当滑动变阻器接入电路的阻值为R时，电压表的示数为3V；则前后两次通过R0的电流之比是____________，电源电压是______________V。
13．如图9所示，表示一种自动测定油箱内油面高度的装置。R是滑动变阻器，它的金属片是杠杆的一端。从油量表(由电流表改装而成)指针所指的刻度，就可以知道油箱内油面的高度。
(1)当油箱向外输油时，油量表的示数将 。
(2)若图9中电源电压为24V，电流表的量程为0-0.6A，滑动变
阻器的最大值为80Ω，为了保证电流表不超量程，保护电阻R/
的最小阻值应是多少欧？
欧姆定律应用四：综合计算二
14．甲、乙两小组同学用图甲所示的电路进行了一些实验探究．
(1)甲小组选取的定值电阻为15W，电阻箱阻值如图乙所示，其值为________W，此时电压表的示数为3．5V，则该小组所用电源的电压为______V；实验中若增大电阻箱阻值，
电路中的电流将________，电压表示数将________ (选填变化情况)．
(2)乙小组选用其它规格的电源和定值电阻进行实验，他们通过调节电阻箱，得到几组电阻箱的阻值和对应的电压值，并作出U-R图像(如图丙)．由图像可知，电阻箱阻值为20W时，电压表的示数为________V，该组所选用定值电阻的阻值为________W．
16． 为锻炼身体,小明利用所学物理知识设计了一个电子拉力计,图甲是原理图。硬质弹簧右端和金属滑片P固定在一起(弹簧的电阻不计，P与R1间的摩擦不计)。定值电阻R0=5Ω，a、b是一根长为5cm的均匀电阻丝，阻值Rab=25Ω，电源电压U=3．OV，电流表的量程为 O～0.6A, 当不拉拉环时，金属滑片P刚好处于a端．已知该弹簧伸长的长度ΔL与所受拉力F间的关系如图乙所示。
(1)小明在电路中连入RO的目的是________________________________.
(2)小明将电流表的表盘改为拉力计的表盘,当不拉拉环时, 拉力计表盘上的零刻度应标在电流表表盘的___________A处.
(3)通过计算说明, 电流表表盘的0.6A处应标多少牛? 100
200
300
6
5
4
3
2
1
F/N
△L/cm
0
图乙
A
拉环
弹簧
R0
R1
b
a
P
图甲
17．小明同学设计的“风力测试仪”在校科技节上备受师生们的青睐，“风力测试仪”的原理如图所示．电源电压6V，R0为保护电阻，AB为长20cm、阻值为50W的均匀电阻丝．OP为质量、电阻均不计的金属细杆，下端连接一个重为2N的球P．闭合开关S，无风时，OP下垂并与电阻丝的B端接触；有风时，球P受风力的作用，使金属细杆OP绕悬挂点O偏转，当偏转到电阻丝的A端时，电流表示数为0．6A．已知悬挂点O与电阻丝B端的距离为10cm，金属细杆OP始终与电阻丝AB接触良好且无摩擦，求：
(1) R0的阻值；
(2)无风时电流表示数；
(3)在风力作用下，当金属细杆OP在图示位置静止时，作出F风的力臂，并求出该力的大小．
18．韩勇同学设计了如图17所示的电路，用来测量电阻R1的阻值。他将开关分别与a、b接触时，电流表的示数之比为5∶2，已知R2＝6Ω，求R1的阻值是多少？
19．如图12所示的电路R1的电阻为10Ω，滑动变阻器的变化范围为 0－50Ω，电源电压为9V，当滑片移动到最右端时，电流表的示数为0.1A，求R2的阻值大小。
1题答案是D,8题答案是D,其他没有图回答不了。
题目呢？？？
哥们，图呢？？
绛旓細<2銆夌伅娉℃甯稿彂鍏夋椂閫氳繃瀹冪殑鐢垫祦锛 銆3銆1KW•h鐢靛彲渚涙鐏场姝ｅ父宸ヤ綔闀挎椂闂达紵 銆4銆夎嫢瀹為檯鐢靛帇涓200V锛屽垯鐏场鐨勫疄闄呭姛鐜囦负澶氬ぇ锛熺伅娉＄殑鍙戝厜鎯呭喌濡備綍锛 瑙ｉ鏂规硶锛氭壘鍑嗛涓殑涓嶅彉閲忋佸彉閲忥紝閫夋嫨鍚堥傜殑鍏紡璁＄畻棰樺瀷涓夛細鐢电儹璁＄畻渚1銆佷袱鐢甸樆涓茶仈鍦ㄧ數璺腑锛屽叾R1=4惟锛孯2=6惟锛岀數婧愮數鍘10V锛岄偅...
绛旓細9锛庢煇鍐板潡涓湁涓灏忕煶鍧楋紝鍐板拰鐭冲潡鐨勬昏川閲忔槸55g锛屽皢瀹冧滑鏀惧湪鐩涙湁姘寸殑鍦嗘煴褰㈠鍣ㄤ腑鎭板ソ鎮诞浜庢按涓紙濡傚浘21鐢叉墍绀猴級銆傚綋鍐板叏閮ㄧ啍鍖栧悗锛屽鍣ㄩ噷鐨勬按闈笅闄嶄簡0.5cm锛堝鍥21涔欐墍绀猴級锛岃嫢瀹瑰櫒鐨勫簳闈㈢Н涓10cm2锛屽凡鐭ハ佸啺=0.9脳103kg/m3锛屜佹按=1.0脳103kg/m3銆傛眰锛氾紙1锛夊啺鍧椾腑鍐扮殑浣撶Н鏄灏戠珛鏂...
绛旓細1銆両1R1=I2R2 I1+I2=15 R1/R2=2:3 鑱旂珛浠ヤ笂鍚勫紡鍙互姹傚嚭I1 I2 2銆佺敳涔欎袱鐏覆鑱斿垯閫氳繃瀹冧滑鐨勭數娴佷竴鏍凤紝閫氳繃涔欑伅鐨勭數娴佷负0.5A锛屼箼鐏殑鐢靛帇涓6/0.5/2*0.5=3 3.涓涓共鐢垫睜瑙嗕负1.5V 鎬荤數闃绘槸10娆э紙鍥犱负鏄苟鑱旓級鐢ㄦ濮嗗畾寰嬪甫鍏 ...
绛旓細10锛庢煇鍚屽鐢ㄤ竴鍙幓鐠冩澂锛屾按鍜屽ぉ骞虫祴涓鍧楃煶瀛愮殑瀵嗗害銆備粬鎶婃澂瀛愯婊℃按鍚庣О寰楁昏川閲 鏄200g锛 鏀惧叆鐭冲瓙鍚庯紝 灏嗘按婧㈠嚭涓閮ㄥ垎浠ュ悗绉板緱鎬昏川閲忔槸215g锛 鎶婄煶瀛愪粠鏉腑鍙栧嚭锛 绉板緱姘村拰鏉瓙鐨勮川閲忎负190g锛屾眰鐭冲瓙鐨勫瘑搴︺11.璧靛啗鍚屽鍦ㄥ閲屾兂鐭ラ亾鏌愮椋熺敤娌圭殑瀵嗗害锛屼簬鏄粬鍒╃敤瀛﹁繃鐨鐗╃悊鐭ヨ瘑璁捐浜嗕竴绉嶆眰...
绛旓細鍒濅腑鐗╃悊鍔涘鍗犳嵁杈冮珮鍒嗗,鑰冨療鏂瑰紡甯镐互鐗╃悊璁＄畻鍜岀墿鐞嗗疄楠岄涓轰富銆傚垵涓墿鐞嗗姏瀛︿富瑕佺煡璇嗙偣鏈:杩愬姩涓庡姏鐨勭粨鍚,鍙傜収鐗,鏈烘杩愬姩,鍔涚殑浣滅敤鏁堟灉,鎯у拰鎯у畾寰,浜屽姏骞宠 ,鍘嬪己(娑蹭綋鐨勫帇寮,澶ф皵鍘嬪己),娴姏,鏈烘鏁堢巼,鍔ㄨ兘鍜屽娍鑳,鏈烘鑳藉強鍏惰浆鍖栥傛湰绡囬檮涓婄粡鍏稿垵涓墿鐞嗗姏瀛璁＄畻棰鍜屽疄楠岄,渚涘悓瀛﹀涔犮備竴銆佸垵涓墿鐞嗗姏瀛︾煡...
绛旓細=11.7kg V閾=5dm^3*锛1-30%锛=3.5dm^3 =0.0035m^3 m閾=0.0035m^3*11.3*10^3kg/m^3 =39.56kg m鎬=11.7kg+39.56kg =51.25kg 蟻=51.25kg/0.005m^3 =10.25*10^3kg/m^3 绛旓細杩欎釜閲戝睘鐞冪殑瀵嗗害鏄10.25*10^3kg/m^3 2銆傝В锛氾紙1锛夌敱棰樻剰鍙煡 V姘=V閰掔簿 璁剧┖鐡...
绛旓細鍘嬪己锛 1銆佷竴鍧楄泲绯曞姘村钩鐩樼殑鍘嬪己涓篜锛屽皢瀹冪珫鐩村鍗婂垏寮鍙栬蛋鍗婂潡锛屽墿涓嬬殑铔嬬硶瀵圭洏鐨勫帇寮轰负P锛囧垯P---P锛2銆佸湪鍦拌川缁撴瀯涓紝鍦颁笅娌瑰眰鐨勫帇寮轰负1.323脳10ⁿ锛坣=7锛夛紝閭ｄ箞 锛1锛変粠鍦伴潰鍚戞娌瑰眰閽讳竴鍙ｆ补浜曞悗锛屽湴涓嬪師娌硅兘鍚﹂潬鑷韩鐨勫帇鍔涘柗鍑哄湴闈?宸茬煡娌瑰眰涓婅〃闈㈣窛鍦伴潰2000m锛岃嫢鑳藉柗鍑猴紝鍠峰嚭...
绛旓細3銆佸鍥撅紝閾呯瑪鐨勮川閲忎负6g锛屽畠鍙楀埌鐨勯噸鍔涙槸 0.06N锛涘凡鐭ラ搮绗斿熬绔殑闈㈢Н鏄0.4cm2锛屽綋涓ゆ墜鎸囩敤4N鐨勫姏浠庝袱绔浉鍚戝帇浣忛搮绗旀椂锛岀瑪灏惧鎵嬫寚鐨勫帇寮烘槸1脳105 Pa锛岀瑪灏栧鐨勫帇寮烘瘮瀹 銆傦紙鍙杇=10N/kg锛夎繖鏄竴閮ㄥ垎锛屽畬鏁撮鐩涓婁紶鐨勯檮浠讹細瀹屽叏鑷繁鏀堕泦鐨勯鐩紝浠呭弬鑰冧娇鐢ㄥ惂銆璋㈣阿銆
绛旓細1銆佷竴鍒200m闀跨殑鐏溅浠14.4鍗冪背/鏃剁殑閫熷害琛岄┒锛屾祴寰楃伀杞︾┛杩囧北娲炲叡鐢ㄤ簡130s銆佸北娲炵殑闀垮害鏄灏戯紵2銆佷竴鐗╀綋鍋氬寑閫熺洿绾胯繍鍔紝瀹冨湪鍓5s鍐呴氳繃鐨勮矾绋嬫槸10m锛屽湪鎺ヤ笅鏉ョ殑10s鍐呴氳繃鐨勮矾绋嬫槸25m锛屽湪鏈鍚5s鍐呴氳繃鐨勮矾绋嬫槸16m銆傗憼鍒嗗埆姹傚嚭瀹冨湪鍓5s锛屾渶鍚5s鍜屽叏绋嬬殑骞冲潎閫熷害銆傗憽閫氳繃浣犵殑璁＄畻缁撴灉璇存槑锛屼负浠涔...
绛旓細瀹朵綇鍐滄潙鐨勫皬褰ょ殑濂跺ザ瀹讹紝涓轰簡鏀瑰杽灞呬綇鏉′欢锛岃鍒掑缓涓搴ф埧瀛愶紝灏忓饯涓哄叾璁捐浜嗗鍥炬墍绀虹殑鍓栭潰鍥俱傝嫢鍦板熀鍜屾埧浣撶殑鎬昏川閲忎负4脳105kg锛屽湴鍩烘荤殑搴曢潰绉负50m2銆傦紙璁＄畻鏃秅鍙10N/kg锛夋眰锛氬湴鍩哄拰鎴夸綋瀵瑰湴闈㈢殑鍘嬪己鏄灏慞a锛熷鍥18鎵绀猴紝鐜荤拑鏉腑瑁呮湁閲3N鐨勬按锛屾按娣10cm锛岃嫢鏉殑閲嶅姏涓1N锛屾澂搴曢潰绉负20cm...
