sat 数学题求翻译the distance from the center of a circular wheel to the outside of its rim is 2.5 feet.the wheel rolls along smooth ground without slipping at a rate of 352 revolutions per minute.what is the rate of travel in miles per hour of a piont on the ou
2019-05-23
sat 数学题求翻译
the distance from the center of a circular wheel to the outside of its rim is 2.5 feet.the wheel rolls along smooth ground without slipping at a rate of 352 revolutions per minute.what is the rate of travel in miles per hour of a piont on the outside of the rim of the wheel
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原文：
轮子半径为：2.5英尺.
轮子以352圈/分钟,的速度在平地上滚动（没有滑动）.
提问：轮子外缘上的一点,以英里为单位,求其每小时运行的速率.
圆周长=圆周率×直径=3.14*2.5*2=15.7英尺
每分钟行程=15.7英尺*352圈=5526.4英尺
每小时英里数=5526.4英尺*60分钟*1/5280=62.8英里
试着答一下吧：
原文：
轮子半径为：2.5英尺.
轮子以352圈/分钟,的速度在平地上滚动（没有滑动）.
提问：轮子外缘上的一点,以英里为单位,求其每小时运行的速率.
圆周长=圆周率×直径=3.14*2.5*2=15.7英尺
每分钟行程=15.7英尺*352圈=5526.4英尺
每小时英里数=5526.4英尺*60分钟*1/5280=62.8英里