Question

A non-uniform zinc rod 60cm weighs 32N is balanced at the 45cm mark. A load of 2N is hung on the zinc rod at the 25cm mark. Where should a second knife-edge be placed to balance the rod horizontally

Answer 1

$$-(45 - 25)2 + (x - 45)R = 0\\-(20)2 + (x - 45)34 = 0\\x=46.2\ cm$$