Vector Quiz

Question 1

Is 5 m/s a vector.

Answer

true

Question 2

What is the addition of the vectors V = (-2 ,5) and W = (7 , 9).

Accepted Answer

VW = (5, 14)

Answer

VW = ( 9 ,14)

Answer

VW = ( 5, 4)

Answer

VW = (9 ,5)

Question 3

What happens when we multiply vector U = ( -3, 4) by scalar 5?

Accepted Answer

U = ( -15, 20)

Answer

U = ( 5, ,5)

Answer

U = (-3,4)

Answer

U = ( 15, 20)

Question 4

What is the subtraction of vectors U = (-7, -3) and W = ( 5, -2)?

Accepted Answer

UW = (-12, -1)

Answer

UW = ( -2, -5)

Answer

UW = ( 12, 1)

Answer

UW = (2, 5)

Question 5

What is the magnitude of the vector ( -1, -6)?

Accepted Answer

sqrt (37 )

Answer

sqrt (36 ) = 6.

Answer

sqrt ( -7)

Answer

sqrt ( 7)

Question 6

If a = (-1, 2) and b = (-2,-3), and if c = -a + 3b, what is vector c?

Accepted Answer

c = (-5, 11)

Answer

c = (-3, 1)

Answer

c = ( 3, 1)

Answer

c = ( -1, 5)

Question 7

If   v ⃗ = (-2, 5), what is the magnitude and direction of v?  Hint: For part 2, remember which quadrant the vector lies in.

Accepted Answer

Magnitude is √29 , and direction is 261.8°

Answer

Magnitude is √7 , and direction is 61.8°

Answer

Magnitude is √3 , and direction is 21.3°

Answer

Magnitude is √27 , and direction is 61.8°

Question 8

Is -2 inches a vector?

Answer

true

Question 9

When two vectors are perpendicular (right angles) to each other the dot product is zero?

Answer

true

Question 10

Find the dot product of vectors v and w. Use the following diagram to answer the question. Round your answer to the nearest hundredth.

Accepted Answer

22.273°

Answer

25.384°

Answer

20.433°

Answer

28.432°

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