ROTATIONAL MOTION

What is the formula for the x-coordinate of the center of mass of a system of particles?

• X = (x₁ + x₂ + ...)/n
• X = m₁x₁ + m₂x₂ + ...
• X = (m₁x₁ + m₂x₂ + ...)/(m₁ + m₂ + ...)
• X = (x₁ + x₂)/2

Why can we guess that the center of mass lies on line OD without calculation?

• Because all squares are identical
• Due to symmetry along the diagonal y = x
• Because the total mass is 3 kg
• Because the origin is at (0,0)

On which line does the center of mass of the L-shaped lamina lie?

• Line OA
• Line OB
• Line OC
• Line OD

What is the y-coordinate of the center of mass of the L-shaped lamina?

• 0.5 m
• 2/3 m
• 5/6 m
• 1 m

What is the x-coordinate of the center of mass of the entire L-shaped lamina?

• 0.5 m
• 2/3 m
• 5/6 m
• 1 m