ROTATIONAL MOTION

In a two-particle system with zero momentum, what is the velocity of the center of mass?

• Equal to c
• Infinite
• Zero
• Depends on mass

How can we determine if a binary system is isolated?

• By measuring temperature
• By counting stars
• By checking if its center of mass moves uniformly
• By observing light

What is the main difference between lab frame and CM frame observations?

• Lab frame has more energy
• CM frame has gravity
• Lab frame includes system drift, CM frame does not
• Colors are different

Why do the two stars in a binary system not collide?

• They repel each other
• They are too far
• They are in stable orbits due to gravitational force and tangential velocity
• They move in straight lines

What is the trajectory of the center of mass in an isolated system with initial velocity?

• Circle
• Parabola
• Helix
• Straight line at constant speed