Determine what kind of work the crane of a fishing trawler must do in order to evenly lift

Determine what kind of work the crane of a fishing trawler must do in order to evenly lift a whale weighing 10 tons to a height of 150 cm.

Problem data: m (weight of the raised whale) = 10 t (in SI m = 10 * 10 ^ 3 kg); h (lifting height) = 150 cm (in SI h = 1.5 m).

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

The work performed by the trawler’s crane is equal to the change in the potential energy of the whale: A = ΔEp = m * g * h.

Let’s perform the calculation: A = 10 * 10 ^ 3 * 10 * 1.5 = 150 * 10 ^ 3 J (150 kJ).

Answer: While lifting the whale, the crane of the fishing trawler performed work of 150 kJ.