ROTATIONAL MOTION

How is the total momentum related to the center of mass velocity?

• P_total = M * a_cm
• P_total = M * v_cm
• P_total = v_cm / M
• P_total = M^2 * v_cm

What is the condition for the center of mass to move uniformly?

• Net internal force is zero
• Net external force is zero
• Velocity is zero
• Acceleration is non-zero

Why do binary stars appear to have complicated paths in the lab frame?

• Because of air resistance
• Due to superposition of CM motion and orbital motion
• Because they emit light
• Because of magnetic fields

What is the shape of the orbit in the center of mass frame for equal mass binary stars?

• Ellipse
• Straight line
• Parabola
• Circle

In the lab frame, what governs the center of mass motion?

• Internal energy
• Temperature
• Initial momentum and external forces
• Magnetic field