Find the efficiency of the mechanism if it has done a work of 3.5 kJ when lifting 22 kg of load up 10 m.

Az = 3.5 kJ = 3500 J.

m = 22 kg.

g = 10 m / s2.

h = 10 m.

Efficiency -?

The efficiency of the efficiency mechanism shows what part of the expended work Az goes into useful Ap.

Efficiency = Ap * 100% / Az.

Since a load of mass m is lifted to a height h, the useful work Ap will be determined by the formula: Ap = m * g * h, where g is the acceleration of gravity.

The efficiency will be determined by the formula: efficiency = m * g * h * 100% / Az.

Efficiency = 22 kg * 10 m / s2 * 10 m * 100% / 3500 J = 62.8%

Answer: the mechanism has an efficiency of 62.8%.