ROTATIONAL MOTION

What is the direction of angular momentum for a particle moving counterclockwise in the xy-plane?

• Along negative z-axis
• Along x-axis
• Along y-axis
• Along positive z-axis

Which of the following best describes the outcome of a × b when a and b are perpendicular?

• A scalar equal to ab
• A vector in the direction of a
• A vector perpendicular to both with magnitude ab
• A zero vector

If |a| = 3, |b| = 4, and θ = 90°, what is |a × b|?

• 7
• 12
• 1
• 5

Which rule uses the thumb to indicate the direction of the cross product?

• Left-hand rule
• Screw rule
• Right-hand rule
• Palm rule

What is the angle between a and a × b?

• 0°
• 45°
• 90°
• 180°