2. 外语
  3. A circular wheel travels along a flat surface at a constant rate of 2.5 feet per second. How many complete revolutions will the

A circular wheel travels along a flat surface at a constant rate of 2.5 feet per second. How many complete revolutions will the

admin2022-11-20  44
问题 A circular wheel travels along a flat surface at a constant rate of 2.5 feet per second. How many complete revolutions will the wheel make in 50 seconds if its diameter is 3 feet?
选项 A、6
B、10
C、13
D、14
E、19
答案C
解析 50秒内轮子走过的距离：轮子的周长(πd)×圈数。50×2.5=π×3×revolutions=13＜revolution＜14。
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