Checkpoint for Vector

Which of the following is an example of the overall magnitude of a vector?

• • 80 N

• • 50 N up, 75N right

• • Fx = 50, Fy = 10

• • 3i + j

• • 52 degrees

What does magnitude mean in the terms of vectors?

• Special

• Numerical size

• The direction of a vector

• Importance

• The size and the direction

A tennis ball is traveling at 20 m/s west and 5 m/s up. What is the overall magnitude of the tennis ball's velocity vector?

• 25 m/s

• 20.6 m/s

• 5 m/s

• 20 m/s

• 425 m/s

Force A acts 2 Newtons west and 3 Newtons south. Force B acts 5 Newtons west and 2 Newtons north. What is the resultant of these two vectors in unit vector form?

• 7i + j

• -7i-j

• -7i+j

• 7i-j

• -7i-5j

Force A acts 2 Newtons west and 3 Newtons south. Force B acts 5 Newtons west and 2 Newtons north. What is the resultant of these two vectors?

• 7 Newtons West, 5 Newtons North

• 3 Newtons West, 5 Newtons South

• 3 Newtons West, 1 Newtons South

• 7 Newtons West, 1 Newtons South

• 7 Newtons West, 5 Newtons South

What is the resultant of vectors (how is it defined)?

• the result of an experiment

• the result in any vector calculation

• your total velocity : speed and direction

• The total value (total vector) after adding two or more vectors together

• the total value (total vector) after subtracting two or more vectors

What is the dot product of 3i + 2j, multiplied by 4i + 8j?

• 32

• 38

• 17

• 28

• 14

What is a vector?

• A quantity that's just number

• A quantity that has direction only

• A quantity that has magnitude (numerical size) only

• an arrow pointing in a particular direction

• a quantity that has both magnitude and direction

If angle 2 measures 60, what does angle 8 measure if the lines are parallel?

• 60

• 30

• 120

• 90

• 180

Vector A has a magnitude of 4 units, vector B has a magnitude of 8 units. If the angle between them is 35 degrees, what is the dot product of vectors A and B?

• 67

• 0

• 18.4

• 32

• 26.2