The crane evenly lifts a load weighing 2 tons. Crane motor power 7.4 kW. Determine the speed of lifting the load.

univerkov | September 30, 2021 | education

Given: the load rises evenly; m (weight of the cargo) = 2 t (in the SI system m = 2 * 10 ^ 3 kg); N (engine power) = 7.4 kW (7.4 * 10 ^ 3 W).

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

Since the speed of lifting the load is constant, then to determine its value, we use the formula: N = F * V = m * g * V, whence V = N / (m * g).

Let’s calculate: V = 7.4 * 10 ^ 3 / (2 * 10 ^ 3 * 10) = 0.37 m / s.

Answer: The constant speed of the load when lifting is 0.37 m / s.

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