ROTATIONAL MOTION

What is the centre of mass of a system of two particles with masses 4 kg and 6 kg at positions x=2 m and x=8 m?

• 5.0 m
• 5.6 m
• 6.0 m
• 6.4 m

If the coordinate system is rotated, how does the centre of mass position change?

• It moves in space
• Its coordinates change but the physical point remains the same
• It becomes zero
• It reverses

How does the centre of mass of a uniform rod depend on its orientation?

• It moves with orientation
• It does not depend on orientation
• It shifts to one end
• It depends on gravity

What happens to the centre of mass if a new particle of zero mass is added?

• It shifts to new particle
• It becomes zero
• It remains unchanged
• It doubles

How is the Y-coordinate of the centre of mass calculated for a system with four particles in a plane?

• Y = (y1 + y2 + y3 + y4)/4
• Y = (m1y1 + m2y2 + m3y3 + m4y4)/(m1 + m2 + m3 + m4)
• Y = ∑yi
• Y = M/∑mi yi