The worker lifts a load weighing 300N using a block system to a height of 1.5m.

The worker lifts a load weighing 300N using a block system to a height of 1.5m. What is the total work of a worker if the efficiency of the blocks is 90%

To determine the complete work of the worker in question, we use the equality: η = Ap / Apoln, whence Apoln = Ap / η = P * h / η.

Values of variables: P – weight of the lifted load (P = 300 N); h – lifting height (h = 1.5 m); η – efficiency of the block system (η = 90% = 0.9).

Let’s calculate: Apoln = 300 * 1.5 / 0.9 = 500 J.

Answer: the total work of the worker in question is 500 J.