Complete the following sentences:
(i) The S.I unit of moment of force is………
(ii) In equilibrium, algebraic sum of moments of all forces about all the point of rotation is ………
(iii) In a beam balance, when the beam is balanced in a horizontal position, it is in........... equilibrium.
(iv) the moon revolving around the earth is in....... equilibrium.

Explanation

Let's solve the question step by step.

### Step 1: Identify the S.I. unit of moment of force.
- The moment of force, also known as torque, is defined as the product of the force and the distance from the point of rotation (lever arm).
- The S.I. unit of force is Newton (N), and the distance is measured in meters (m).
- Therefore, the S.I. unit of moment of force is Newton meter (N·m).

**Answer:** The S.I. unit of moment of force is **Newton meter**.
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