A uniform meter rule weighing 0.5N is to be pivoted on a knife-edge at the 30cm-mark. where will a force of 2N be placed from the pivot to balance the meter rule?
A
95cm
B
25cm
C
20cm
D
5cm
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Taking moment about P,
2 x d = 0.5 x (50 - 30)
2x = 10
x = 5 cm
Source: WAEC / JAMB / NECO Classroom Archive (Record #27602)