The winch evenly lifts a 200 kg load to a height of 3 m in 5 seconds. What is the net power of the winch motor?

To find out the useful power of the engine of the used winch, we use the formula: Npol = A / t = ΔEp / t = mg * g * Δh / t, where mg is the mass of the load lifted by the winch (mg = 200 kg); g – acceleration due to gravity (g ≈ 10 m / s2); Δh – change in height (Δh = 3 m); t is the duration of the winch operation (t = 5 s).

Let’s perform the calculation: Npol = mg * g * Δh / t = 200 * 10 * 3/5 = 1.2 * 10 ^ 3 W.

Answer: The net engine power of the used winch is 1.2 kW.