来源：学生作业帮 编辑：灵鹊做题网作业帮 分类：英语作业 时间：2024/04/30 12:22:46
数学问题,英文的,和revolution有关
A gear is driven by a chain that travels 2.5 m per second. Find the radius of the gear if it makes 4π revolutions per minute.
每分钟转4π 圈,而传送带的速度是2.5m/s,即2.5*60米/分钟＝150m per minute
所以有 150 = 4π * (2π*r),r = 150/(8π^2)≈1.9m
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