# Rotational equilibrium

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##### Examples

###### Lessons

**Rotational equilibrium of masses balanced on a single pivot point**A uniform 1.10 kg rod is balanced on a pivot and two masses of 2.50 kg and 1.25 kg are hung as shown. At what distance away from the pivot should the 1.25 kg mass be hung so that the two masses balance?

**Rotational equilibrium with two pivot points**A 1.75 kg uniform book rests on a 1.10 kg uniform horizontal shelf as shown. What is the force exerted on the shelf by each support A and B?