The tip of a blade of an electric fan is 1.5 feet from the axis o_数学解答

The tip of a blade of an electric fan is 1.5 feet from the axis of rotation.If the fan spins at a full rate of 1760 revolutions per minute,how many miles will a point at the tip of a blade travel in an hour?(1 mile=5280 feet)

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解答

电风扇的顶部扇叶距离旋转轴1.5英尺,如果电风扇以每分钟1760最大的转速转动的话,那么电风扇顶部的扇叶在一小时内将会走过多少英里的路程.这样就很简单了,由题可以知道这个圆的半径就是1.5英尺,那么旋转一周的路程就...