ROTATIONAL MOTION

What is the centre of mass of two particles of mass 5 kg each at positions (0,0) and (4,0)?

• (0,0)
• (2,0)
• (4,0)
• (1,0)

If all particles in a system are shifted such that each xi increases by 5 units, what happens to X?

• X remains same
• X increases by 5 units
• X doubles
• X becomes zero

How is the centre of mass of a triangular lamina different from three particles at vertices?

• It is at a vertex
• It is outside
• For uniform lamina, it is at centroid; same as equal mass particles
• It is at the circumcentre

What is the effect of adding a particle with negative mass on the centre of mass?

• It shifts toward the particle
• It shifts away from the particle's position
• No effect
• It becomes zero

If a system is symmetric about a point, where is the centre of mass?

• At infinity
• At that point of symmetry
• At the surface
• It depends