ROTATIONAL MOTION

In Fig. 6.13(a), what is the state of the center of mass before decay?

• At rest
• Accelerating
• Oscillating
• In uniform motion

What is the shape of the center of mass trajectory in Fig. 6.14(a)?

• Circle
• Parabola
• Spiral
• Straight line

Why do astronomers use the center of mass frame when studying double stars?

• To increase resolution
• To change color
• To isolate orbital motion from system drift
• To reduce data

In a system with zero total momentum, where is the center of mass moving?

• It moves fast
• It moves slowly
• It is at rest
• It accelerates

What is the role of internal forces in altering the center of mass velocity?

• They increase it
• They decrease it
• They reverse it
• They cannot change it