滚铁环,铁环直径为40厘米,若每秒转动5周,六分钟,跑几米?
问题描述:
滚铁环,铁环直径为40厘米,若每秒转动5周,六分钟,跑几米?
答
周长为40π厘米,6分钟=360秒=1800圈,跑40πx1800=72000π厘米=720π米
滚铁环,铁环直径为40厘米,若每秒转动5周,六分钟,跑几米?
周长为40π厘米,6分钟=360秒=1800圈,跑40πx1800=72000π厘米=720π米