The cyclist was traveling at a speed of 25.2 km / h. How many revolutions did a wheel

The cyclist was traveling at a speed of 25.2 km / h. How many revolutions did a wheel with a diameter of 80 cm make in 15 seconds?

To determine the number of revolutions made by a bicycle wheel in 15 seconds, we apply the formula: N = t / T = t / (Π * d / V) = V * t / (Π * d).

Variables: V – speed of a wheel, cyclist (V = 25.2 km / h = 7 m / s); t is the duration of the wheel rotation (t = 15 s); d – diameter (d = 80 cm = 0.8 m).

Let’s perform the calculation: N = V * t / (Π * d) = 7 * 15 / (3.14 * 0.8) = 41.8 about ≈ 42 about.

Answer: The wheel should have made 42 revolutions in 15 seconds.