题目内容
某同学在做测重力加速度实验时,单摆完成50次全振动秒表如图12所示,则单摆周期为 ,小球直径用游标卡尺测得如图13所示,则读数为
cm 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241342515701197.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413425163215327.png)
cm 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241342515701197.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413425163215327.png)
2s, 2.98cm
由图12知,分针读数为1.5min=90s,秒针读数为10.1s,总时间为t=90+10.1=100.1s,单摆周期为T=
;由图13知主尺读数为2.9cm,游标尺读数为8
0.1=0.8mm=0.08cm,所以游标卡尺读数为2.9cm+0.08cm=2.98cm。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134251679818.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134251726214.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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