The worker lifts a load of 100 kg to a height of 30 cm. Using the levers, a force is applied to the large arm of the lever.

The worker lifts a load of 100 kg to a height of 30 cm. Using the levers, a force is applied to the large arm of the lever. 700 newtons under the action of which the lever is lowered 60cm, determine the efficiency.

To calculate the efficiency of the lever used by the worker, we apply the formula: η = Ap / Az = m * g * h / (F * S).

Constants and variables: m – weight of the cargo (m = 100 kg); g – acceleration due to gravity (g ≈ 10 m / s2); h – lifting height (h = 30 cm = 0.3 m); F is the applied labor force (F = 700 N); S is the distance the lever dropped (S = 60 cm = 0.6 m).

Let’s calculate: η = 100 * 10 * 0.3 / (700 * 0.6) = 0.714 or 71.4%.

Answer: The working lever used has an efficiency of 71.4%.