ROTATIONAL MOTION

If a × b = c, what is the relationship between c and the plane of a and b?

• c lies in the plane
• c is parallel to a
• c is parallel to b
• c is perpendicular to the plane of a and b

What is the result of i × j in unit vector notation?

• −k
• i
• k
• j

Why is the smaller angle used in computing the cross product?

• Because it gives a larger magnitude
• To make calculations easier
• Because it is always acute
• To ensure a unique direction using the right-hand rule

What is the direction of the cross product if both vectors lie in the xy-plane?

• Along the x-axis
• Along the y-axis
• Along the z-axis
• In the xy-plane

If vector a has magnitude 4 and vector b has magnitude 5, and they are perpendicular, what is |a × b|?

• 9
• 20
• 1
• 0