The tower crane lifts a load with a mass of 5 tons and an engine power of 30 kW.

The tower crane lifts a load with a mass of 5 tons and an engine power of 30 kW. How long will it take to rise to a height of 20 m?

To find the duration of the lifting of the load by the indicated tower crane, we use the formula: t = A / N = mg * g * h / N.

Data: mg – weight of the cargo (mg = 5 t = 5 * 10 ^ 3 kg); g – acceleration of gravity (g = 9.81 m / s2); h – change in the height of the load (h = 20 m); N is the power of the specified tower crane (N = 30 kW = 3 * 10 ^ 4 W).

Calculation: t = mg * g * h / N = 5 * 10 ^ 3 * 9.81 * 20 / (3 * 10 ^ 4) = 32.7 s.

Answer: The indicated tower crane lifted the load in 32.7 seconds.