ROTATIONAL MOTION

In a binary system, if one star is twice as massive, how does its orbital radius compare?

• Same as lighter
• Twice as large
• Half that of the lighter star
• Four times larger

Why is the motion in Fig. 6.13(b) simpler than in Fig. 6.13(a)?

• Because particles are slower
• Because no energy is released
• Because the center of mass is at rest
• Because gravity is off

What is conserved in both magnitude and direction during radioactive decay?

• Kinetic energy
• Potential energy
• Total linear momentum
• Temperature

How does the mass of a star affect its distance from the center of mass in a binary system?

• No effect
• Farther from CM
• Greater mass means closer to center of mass
• Moves randomly

What is the key advantage of decomposing motion into CM and relative parts?

• It increases energy
• It changes mass
• It simplifies complex system dynamics
• It stops motion