The crane lifted a 4.5t load to a height of 8m in 10 seconds. What is the power of the crane engine?

To determine the engine power of the crane used, we apply the formula: N = A / t = m * g * h / t, where m is the mass of the lifted load (m = 4.5 t, in the SI system m = 4.5 * 10 ^ 3 kg); g – acceleration due to gravity (g ≈ 10 m / s2); h – lifting height (h = 8 m); t is the duration of the crane operation (t = 10 s).

Let’s perform the calculation: N = m * g * h / t = 4.5 * 10 ^ 3 * 10 * 8/10 = 36 * 10 ^ 3 W or 36 kW.

Answer: The motor power of the crane used is 36 kW.