A forklift with an electric winch lifted a load weighing 200 kg to a height of 20 m

A forklift with an electric winch lifted a load weighing 200 kg to a height of 20 m, while the electric motor performed work of 48 kJ. calculate the efficiency of the winch.

From the condition of the problem, it is known that a lift with an electric winch lifted a load weighing m = 200kg to a height of h = 20m, while the electric motor performed work Azat = 48 kJ = 48000 J. The efficiency of the winch can be calculated by the formula: ∙ 100%, where A floor = m ∙ g ∙ h, g = 9.8 N / kg. We get η = (200 ∙ 9.8 ∙ 20: 48000) ∙ 100% ≈ 82%.
Answer: The efficiency of the winch is 82%.