Vectors

The magnitude of the vector 3i + 4j is:

• 1 1
• 2 5
• 3 7
• 4 25

The dot product of i and j is:

• 1 0
• 2 1
• 3 -1
• 4 k

If a = (1, 2, 3) and b = (4, 5, 6), then a . b is:

• 1 21
• 2 6
• 3 15
• 4 32

i x j equals:

• 1 0
• 2 -k
• 3 i
• 4 k

Two vectors are perpendicular when their dot product is:

• 1 Their product of magnitudes
• 2 Negative
• 3 One
• 4 Zero

The unit vector in the direction of 3i + 4j is:

• 1 5i
• 2 (i + j) / 2
• 3 (3i + 4j) / 5
• 4 3i + 4j

The magnitude of i + j + k is:

• 1 0
• 2 1
• 3 The square root of 3
• 4 3

The cross product a x b is a vector:

• 1 Perpendicular to both a and b
• 2 Parallel to a
• 3 Parallel to b
• 4 Of zero length always