How many revolutions will the wheel of a car traveling at a speed of 60 km / h make in 9 minutes if the wheel diameter is 0.75 m?
| January 4, 2021 | education
Find the distance that the car has driven
Distance = time * speed
60 km / h = 1 km / min
Distance = 1 km / min * 9 min = 9 km = 9000 m
Wheel circumference = 2пR
п≈3
Circumference = 2 * 3 * 0.75m = 4.5m
Find the number of revolutions N
N = 9000 / 4.5 = 2000
Answer: 2000 rpm.
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