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【简答题】
如图所示,小车、打点计时器等器材置于高度可调节的长木板上. (1)在验证牛顿第二定律的实验中,除打点计时器(附纸带、复写纸)、小车(其上可放置砝码)、细线、钩码(质量已知)、附滑轮的长木板、导线外,在下面的仪器和器材中,必须使用的有________.(填写序号) 1电压合适的50 Hz交流电源 2电压可调的直流电源 3刻度尺 4秒表 5天平 实验时通过改变________,可验证质量一定时,加速度与正比的关系;通过________,可验证力一定时,加速度与质量成反比的关系. (2)在验证牛顿第二定律的实验中,若平衡摩擦力时,长木板的一端调节过高,使得倾角偏大,则所得到的a-F关系图象为________.(a是小车的加速度,F是细线作用于小车的拉力) A. B. C. D. (3)实验中得到一条纸带,在纸带上便于测量的地方选取第1个计数点,其下标明A,第6个计数点下标明B,第11个计数点下标明C,第16个计数点下标明D,第21个计数点下标明E.若测得AC长为14 . 56 cm,CD长11 . 15 cm,DE长为13 . 73 cm,则小车运动的加速度大小为________m/s 2 ,打C点时小车的瞬时速度大小为________m/s.(保留三位有效数字)
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举一反三
【多选题】三、 七选五 根据短文内容 , 从短文后的选项中选出能填入空白处的最佳选项 , 选项中有两项为多余选项 。 The science of risk - seeking Sometimes we decide that a little unnecessary er is worth it because when we weigh the risk and the reward, the ...
B.
. Those are the risks you should jump to take.
C.
. Being better at those things meant a greater chance of survival.
D.
. Thus, these well - equipped people survived because they were the fittest.
E.
. This is when you start to move away from your family and into the bigger world.
F.
. However, we are not all using the same reference standard to weigh risks and rewards.
G.
. New brain research suggests our brains work differently when we face a nervous situation.
查看完整题目与答案
【单选题】All the f o llowing activities are mentioned as part of the training one should take to become a successful actor EXCEPT that he/she should .
A.
study the great actors
B.
take classes
C.
learn more about the world
D.
perform in front of the mirror
查看完整题目与答案
【单选题】饮用水的净化和消毒处理步骤通常是 。
A.
消毒 - 沉淀 - 过滤
B.
沉淀 - 过滤 - 消毒
C.
沉淀 - 消毒 - 过滤
D.
过滤 - 消毒 - 沉淀
查看完整题目与答案
【单选题】We need to _____ ab eye o all the activities to make sure that people stay safe.
A.
catch
B.
keep
C.
take
D.
bring
查看完整题目与答案
【多选题】豆豉在烹饪中的作用主要有( )
A.
提鲜
B.
增香
C.
去腥
D.
杀菌
查看完整题目与答案
【单选题】Which of the following All Hallows' Day Activities does not exist in the United States?
A.
Make Jack-o-lanterns
B.
Trick or treat
C.
Sweep the graves
D.
Halloween Parade
查看完整题目与答案
【简答题】I decided that it doesn’t matter what happens to me. What really matters is how I deal with it. And therefore, I decided to (8) my life to bringing down the walls that separate people.
查看完整题目与答案
【简答题】将二进制的110110转换成十进制
查看完整题目与答案
【多选题】In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank above the passage. Read the passage through carefull...
A.
allowed
B.
behavior
C.
perfectly
D.
conducting
E.
excessively
F.
extreme
G.
redirect
H.
tolerated
I.
submission
J.
foundation K. devote L. domestic M. establish N. pleasantly O. performing
查看完整题目与答案
【单选题】图中害虫为
A.
大化螟
B.
二化螟
C.
三化螟
D.
稻纵卷叶螟
查看完整题目与答案
相关题目：
【多选题】三、 七选五 根据短文内容 , 从短文后的选项中选出能填入空白处的最佳选项 , 选项中有两项为多余选项 。 The science of risk - seeking Sometimes we decide that a little unnecessary er is worth it because when we weigh the risk and the reward, the ...
B.
. Those are the risks you should jump to take.
C.
. Being better at those things meant a greater chance of survival.
D.
. Thus, these well - equipped people survived because they were the fittest.
E.
. This is when you start to move away from your family and into the bigger world.
F.
. However, we are not all using the same reference standard to weigh risks and rewards.
G.
. New brain research suggests our brains work differently when we face a nervous situation.
查看完整题目与答案
【单选题】All the f o llowing activities are mentioned as part of the training one should take to become a successful actor EXCEPT that he/she should .
A.
study the great actors
B.
take classes
C.
learn more about the world
D.
perform in front of the mirror
查看完整题目与答案
【单选题】饮用水的净化和消毒处理步骤通常是 。
A.
消毒 - 沉淀 - 过滤
B.
沉淀 - 过滤 - 消毒
C.
沉淀 - 消毒 - 过滤
D.
过滤 - 消毒 - 沉淀
查看完整题目与答案
【单选题】We need to _____ ab eye o all the activities to make sure that people stay safe.
A.
catch
B.
keep
C.
take
D.
bring
查看完整题目与答案
【多选题】豆豉在烹饪中的作用主要有( )
A.
提鲜
B.
增香
C.
去腥
D.
杀菌
查看完整题目与答案
【单选题】Which of the following All Hallows' Day Activities does not exist in the United States?
A.
Make Jack-o-lanterns
B.
Trick or treat
C.
Sweep the graves
D.
Halloween Parade
查看完整题目与答案
【简答题】I decided that it doesn’t matter what happens to me. What really matters is how I deal with it. And therefore, I decided to (8) my life to bringing down the walls that separate people.
查看完整题目与答案
【简答题】将二进制的110110转换成十进制
查看完整题目与答案
【多选题】In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank above the passage. Read the passage through carefull...
A.
allowed
B.
behavior
C.
perfectly
D.
conducting
E.
excessively
F.
extreme
G.
redirect
H.
tolerated
I.
submission
J.
foundation K. devote L. domestic M. establish N. pleasantly O. performing
查看完整题目与答案
【单选题】图中害虫为
A.
大化螟
B.
二化螟
C.
三化螟
D.
稻纵卷叶螟
查看完整题目与答案
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