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
Correct Answer: Option B
Explanation
Taking moment about P,
2 x (30 – x) = 0.5 x (50 – 30)
60 – 2x = 10
2x = 50
x = 25 cm