Pretest

Question 1

Assuming motion is on a straight path, what would result in two positive components of a vector?

Revolt · Accepted Answer

C: a train moving north of east at an angle of  25 degrees

Question 2

In order to use the Pythagorean theorem to find the magnitude of a resultant vector, which must be true regarding the two initial vectors?

Revolt · Accepted Answer

B: They form a 90 degree angle.

Question 3

Suppose two initial vectors intersect at a right angle and form a resultant vector. The magnitudes of one initial vector, cap A , and the resultant vector, cap r , are given. Which formula can be used to find the magnitude of the other initial vector, cap b ?

Revolt · Accepted Answer

B: cap b squared is equal to cap r squared minus cap A squared

Question 4

A jogger runs 5 point 0 km on a straight trail at an angle of 60 degrees south of west. What is the southern component of the run rounded to the nearest tenth of a kilometer?

Revolt · Accepted Answer

C: negative 4 point 3 km

Question 5

The angle a vector makes with the x -axis of a coordinate system must be what size in order to make one or more of its components negative?

Revolt · Accepted Answer

D: greater than  90  degrees

Question 6

What is the magnitude of vector X?

Revolt · Accepted Answer

B: 72 cm

Question 7

Question 7

Revolt · Accepted Answer

10

Pretest Answers

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