Train speed 72 km / h. How many revolutions per minute do the locomotive wheels make if their radius is 1.2 m.
| February 1, 2021 | education
Initial data: V (train speed) = 72 km / h (20 m / s); R (radius of locomotive wheels) = 1.2 m; t (duration of movement of the locomotive) = 1 min (60 s).
The number of revolutions of the locomotive wheels per minute is determined by the formula: N = t / T = t * V / (2 * Π * R).
Calculation: N = 60 * 20 / (2 * 3.14 * 1.2) ≈ 159 revolutions.
Answer: The wheels of the locomotive make 159 revolutions in 1 minute.
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