初二物理计算题十道谢谢

物理八年级上计算题10道，谢谢~

好不容易才找到，希望可以帮到你　


　①某人打靶，靶与人的距离340米，子弹离开枪口后经过1.5秒，某人听到子弹打靶的声音，设空气阻力不计，则子弹离开枪口速度是多少？
②在铸铁管的一端敲一下，在另一端听到两次，若管长900米,两次响声间隔2.4秒。声音在空气中传播速度为340米每秒，求铸铁里的声速？
③一辆汽车在平直的公路上朝山崖方向匀速行驶，速度为36KM/h，在距离山崖的一段距离时，汽车开始鸣笛，2秒后司机刚好听到鸣笛的回声，已知声音在空气中的传播速度是340m/s，求汽车鸣笛时据山崖多远？
④甲"乙两列火车在平直铁轨上以相同的速度相向而行，甲车鸣笛一声，经5s乙车上的人听到又经50s后，辆车相遇而错车。求两车之间的距离。
⑤.甲、乙两地的铁路线长2430千米，火车从甲地开往乙地途中通过一个1050米长的隧道，用了1分10秒钟。火车通过隧道的平均速度是多少米/秒？合多少千米/小时？
　　⑥超音速飞机每小时正常飞行距离至少在 Km以上。(飞行速度达到1078公里/小时)
⑦某人在相距1200m的两山之间开了一枪，在开枪后听到两次回声的时间相差5S，此人距离两山的距离分别是多少？（温度为15℃）
⑧一个人打靶，目标和人相距280m，子弹离开枪口后1.3S,该人听到子弹击中靶的声音,空气的声速为340m/S,求子弹出口速度多大?
（2）火车以这个平均速度从甲地开到乙地需要行驶多少小时？
⑨一艘快艇以90km／h的速度去追赶离它120km远处的军
舰，快艇实际航行了270km才追上军舰，军舰的速度多大？
⑩甲以16km／h速度出发2h后，乙从甲出发处以8m／s速度去
追赶甲，则乙经多少时间追上甲，此时乙走过多少路程？

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

欧姆定律应用四：综合计算一
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？？

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