Can anybody do this question i'm confused:
A non uniform rod AB of length 20 cm rests horizontally on two supports at C and D, where AC=BD=4cm. The greatest mass that can be hung from A without disturbing equilibrium is 8g, and the greatest mass that can be hung from B is 10g (when no mass is hung from A) is 10g. Find the mass of the rod and the distance of its centre of mass from A.
The answer is a mass of 6g and 9.3cm. But not sure how to get it.