Question

A worker uses a pulley to lift a 600 N load. To raise the load 3 m, the worker pulls 9 m of rope. Assuming the system is ideal, what force does the worker apply?
(1 point)
The worker applies 66.7 N of force.
The worker applies 1800 N of force.
The worker applies 200 N of force.
The worker applies 600 N of force.

Answer 1

The worker applies 200 N of force.

Reason: Work in = work out (ideal pulley). F·9 m = 600 N·3 m ⇒ F = (600·3)/9 = 200 N.