Answer:
0.50 kg
Explanation:
From the equilibrium condition, torques must be balanced. Torque is the product of force and distance.
The unknown mass is at a distance of 20 cm from the suspension point (30 cm). The 0.20 kg is at a distance of 0.50 cm from that same point.
Clockwise torques must equal anti clockwise torques.
So (0.20 m) (M g) = (0.50 m)(0.20 g)
Here M is the unknown mass and g stands for gravity.
⇒ Unknown mass = M = (0.50 × 0.20 ) ÷ (0.20)= 0.50 kg
