ROTATIONAL MOTION

What is the centre of mass of a system of two identical particles separated by distance d?

• At one particle
• At the midpoint of the line joining them
• At a distance d/3 from one
• At infinity

How is the centre of mass affected by a change in the reference frame?

• It moves in space
• Its coordinates change but not its physical location
• It becomes zero
• It doubles

What is the primary reason for using vectors in centre of mass calculations?

• To increase complexity
• To handle 3D systems efficiently
• To eliminate mass
• To add time dependence

How does the centre of mass of a uniform rod lie?

• At one end
• At its midpoint
• At one-fourth length
• At two-thirds length

If the origin is at the centre of mass, what is the value of ∑mi xi?

• Total mass
• Zero
• Total momentum
• Infinity