问题 问答题

某同学不小心掉了半块饼干在地上,五分钟后发现饼干上聚集了许多蚂蚁.那么五分钟前这些蚂蚁离饼干的最远距离为多少呢?确定这个最远距离的关键是测出蚂蚁的爬行速度.某班学生以小组为单位进行实验探究活动:估测蚂蚁的爬行速度,下表是各小组的实验方案及结果.

估测蚂蚁的爬行速度

组别实验方案平均速度
.
v
(cm/s)
1用面包吸引蚂蚁,使它在二直尺间运动1.20
2让沾有墨水的蚂蚁在纸槽内运动0.30
3让直玻璃管内的蚂蚁向另一端运动1.04
4让蚂蚁在盛有粉笔的纸槽内运动0.45
5让蚂蚁在塑料吸管内爬行,同时点燃蚂蚁身后的塑料吸管2.40

答案

由表中数据得出,蚂蚁在不同物体表面上的最大爬行速度:

v=2.4m/s,

∵v=

s
t

∴5min前这些蚂蚁离饼干的最远距离:

s=vt=2.4cm/s×5×60s=720cm=7.2m.

答:5min前这些蚂蚁离饼干的最远距离为7.2m.

解答题
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