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

A
a car moving south of west at an angle of 10 degrees
B
a bus moving north of east at an angle of 95 degrees
C
a train moving north of east at an angle of 25 degrees
D
a boat moving south of west at an angle of 40 degrees
4
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In order to use the Pythagorean theorem to find the magnitude of a resultant vector, which must be true regarding the two initial vectors?

A
They are equal in magnitude.
B
They form a 90 degree angle.
C
They have the same directions.
D
They are parallel to one another.
6

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 ?

A
cap b squared is equal to cap A plus cap r
B
cap b squared is equal to cap r squared minus cap A squared
C
cap b squared is equal to cap r squared plus cap A squared
D
cap b squared is equal to cap A squared minus cap r squared
8

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?

A
less than 30 degrees
B
between 30 and 60 degrees
C
between 61 and 90 degrees
D
greater than 90 degrees
9

What is the magnitude of vector X?

A
5625 cm
B
72 cm
C
5184 cm
D
54 cm

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