With the help of a movable block, the worker lifts a load weighing 600 N. to a height of 4 m.

With the help of a movable block, the worker lifts a load weighing 600 N. to a height of 4 m. With what force does he pull the rope? How long will he pull the horses of the rope?

Data: moving block; h (lifting height) = 4 m; P (load weight) = 600 N.

1) The force with which the worker pulls the rope (the block gave a 2-fold gain in strength): F = P / 2 = 600/2 = 300 N.

2) The length of the extended end of the rope (the block gave a loss in distance by 2 times): l = 2h = 2 * 4 = 8 m.

Answer: The worker pulled the rope with a force of 300 N; the end of the rope was stretched 8 m.