Question

A uniform half-metre rule pivoted at the 10cm mark, balances when a mass of 150g is suspended at the 0cm mark as shown below. Determine the mass of the half-metre role. 

Answer 1

Clockwise moments = Anticlockwise moments
1.5 x 1.0 = W x 0.15
W = 0.15
       0.15
W=1N