The cyclist travels at a speed of 18 km / i. How many revolutions per minute do the wheels of a bicycle make if their radius is 40 cm?
| November 26, 2020 | education
1) The perimeter of the circle is equal to the product of the radius by two pi (3.1415), it can be understood that the perimeter of the wheel = 40x2x3.14 = approximately 251 cm.
2) 18 km / h = 5 m / s = 300 m / min
3) 300 m = 30,000 cm
4) 30000cm / 251cm = 119.521912 = approximately 120 rpm.
Answer: 120 rpm will make the wheel.
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