Train speed 72 km / h. How many revolutions per minute do the locomotive wheels make if their radius is 0.6 m.

To find the number of revolutions made by the wheels of a given locomotive, we will use the formula: N = t / T = t / (2 * Π * R / V) = t * V / (2 * Π * R).

Values of variables: t – time of movement of the locomotive (t = 1 min = 60 s); V – speed of movement (V = 72 km / h = 20 m / s); R is the radius of the wheels (R = 0.6 m).

Let’s calculate: N = t * V / (2 * Π * R) = 60 * 20 / (2 * 3.14 * 0.6) ≈ 318 revolutions.

Answer: In 1 minute of movement, the wheels of a given locomotive will make 318 revolutions.