ROTATIONAL MOTION

What is the magnitude of a·(b×c) equal to?

• Sum of vector magnitudes
• Area of parallelogram
• Product of vector lengths
• Volume of parallelepiped formed by a, b, c

What does the scalar triple product a·(b×c) represent?

• Area of triangle
• Magnitude of resultant vector
• Volume of sphere
• Volume of the parallelepiped

What is the area of the triangle formed by vectors a and b?

• |a × b|
• (1/2)|a × b|
• |a + b|
• |a · b|

A child runs inside a moving trolley. What determines the speed of the center of mass of the system?

• Friction between child and trolley
• Child's running speed
• External air resistance
• Total momentum and total mass

What happens to the speed of the center of mass of a trolley-child system when the child runs inside the trolley?

• Becomes zero
• Increases
• Decreases
• It remains V