What is the power of the crane engine if it lifts a concrete slab weighing 2 tons to a height of 20 m in 20 seconds?

univerkov | February 4, 2021 | education

These tasks: m (mass of the concrete slab lifted by the crane) = 2 t (in SI m = 2 * 10: 3 kg); h (lifting height) = 20 m; t (engine running time) = 20 s.

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

We calculate the motor power of the crane used by the formula: N = A / t = ΔEp / t = m * g * h / t.

Let’s calculate: N = 2 * 10: 3 * 10 * 20/20 = 20 * 10: 3 W (20 kW).

Answer: The motor power of the crane used is 20 kW.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.