Question Detail
Question
A uniform meter rule weighs 1 kg and is pivoted at the 60 cm mark. A 40 g weight is suspended from the 100 cm mark. At which mark should a 30 g mass be placed to keep equilibrium?
Correct Answer
Option A is the correct answer.
Detailed Explanation
For equilibrium, clockwise moment equals anticlockwise moment about the pivot. Solving the moment equation gives position = 20 cm.
Hint
Take moments about the pivot at 60 cm.