Determine the useful power of the crane knowing that it lifts a load weighing 2 tons to a height of 6 m in 1 minute.

Given: m (mass of the load that the crane lifts) = 2 t (2 * 10 ^ 3 kg); h (lifting height) = 6 m; t (duration of ascent) = 1 min (60 s).

Reference data: g (acceleration due to gravity) ≈ 10 m / s2.

Let’s define the formula for calculating the useful power of the crane: N = A / t = F * h / t = m * g * h / t.

Let’s make the calculation: N = 2 * 10 ^ 3 * 10 * 6/60 = 2000 W (2 kW).

Answer: The required useful power of the crane is 2 kW.