ROTATIONAL MOTION

Two particles, each of mass m and speed v, move in opposite directions along parallel lines separated by distance d. What is the magnitude of the total angular momentum about a point midway between the lines?

• mvd/2
• mvd
• 2mvd
• zero

Why is the angular momentum of a particle moving in the x-y plane directed along the z-axis?

• Due to gravitational force
• Because the motion is linear
• The z-axis is vertical
• Because the z-components of r and p are zero

If a particle moves only in the x-y plane, which component of its angular momentum is non-zero?

• Only x-component
• Only y-component
• Both x and y components
• Only the z-component

What are the components of the angular momentum l of a particle?

• r · p
• p × r
• r + p
• r × p

What is the magnitude of the scalar triple product a·(b×c)?

• Product of the three magnitudes
• Area of parallelogram
• Magnitude of resultant
• Equal to the volume of the parallelepiped formed by a, b, c