摘要
在用落球法测定液体的粘滞系数实验时,最初阶段小球的下落速度是变化的,当小球到达匀速时下落的距离非常微小,计时时不需要在实验中预留一段距离.通过Matlab描绘最初阶段小球下落速度及下落位移随时间的变化关系,结果表明:小球从无初速度进入液体至达到匀速运动所用的时间是极短的,实验中可不需考虑这个过程.
Speed of the ball changes at the beginning stage in the experiment of measuring liquid viscosity coefficient by the falling-ball method.When the ball arrives at the average velocity,it moving is so short that we can negelect moving distance,which need not begin to timing after some distance in the experiment.We depict the velocity and displacement changes with time by Matlab.The result shows that the time when the ball gets constant speed from no-speed to averag-velocity in the liguid is so short that we don＇t need to consider it at all.
出处
《广西工学院学报》
CAS
2011年第1期70-73,共4页
Journal of Guangxi University of Technology
基金
广西工学院教改项目(J1019)
广西工学院教改项目(J0924)
新世纪广西教改工程"十一五"立项项目资助
关键词
落球法
粘滞系数
MATLAB
falling-ball method
viscosity coefficient
Matlab
