Imagine a bar of steel 80 cm long pivoted horizontally at its left end, as depicted in

Question:

Imagine a bar of steel 80 cm long pivoted horizontally at its left end, as depicted in Fig. 5-2. Find the torque about axis-A (which is perpendicular to the page) due to each of the forces shown acting at its right end. Lever arm A 80 cm 25 N 25 Fig. 5-2 90 20 N 10 N