JAMB - Physics (2016 - No. 21)
A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?
30cm
10cm
20cm
25m
توضیح
Clockwise moment = Anti-clockwise moment
10 x 30 = 15 x X
X = 20cm
10 x 30 = 15 x X
X = 20cm