将细铜丝在铅笔上紧密排绕50圈,用刻度尺侧得50圈铜线的宽度为7.25cm.则该铜丝的直径约为多少毫米?
问题描述:
将细铜丝在铅笔上紧密排绕50圈,用刻度尺侧得50圈铜线的宽度为7.25cm.则该铜丝的直径约为多少毫米?
答
d=7.25cm/50=0.145cm=1.45mm
将细铜丝在铅笔上紧密排绕50圈,用刻度尺侧得50圈铜线的宽度为7.25cm.则该铜丝的直径约为多少毫米?
d=7.25cm/50=0.145cm=1.45mm