Question Detail
Question
A force of 180 N is applied at the end of a 50 cm crowbar to lift a weight. What length of crowbar is needed to lift the same weight with a 150 N force?
Correct Answer
Option D is the correct answer.
Detailed Explanation
The principle of moments applies. For the same load (resistance), the product of effort force and its distance from the fulcrum must be constant. So, 180 N * 50 cm = 150 N * L2. L2 = (180 * 50) / 150 = 60 cm.
Hint
The moment (torque) required to lift the load remains constant.