Representing Vectors in 3D Space

[Tiven white]

Homework Statement

In 3D space a full vector can be represented I. All the following except
A. In Cartesian vector form
B.As a magnitude times a unit vector
C. As a Cartesian vector times a unit vector
D. As magnitude with coordinate angles

Homework Equations

The Attempt at a Solution

I say the answer is reason being I found all the other statements correct therefore I solve by elimination of variables. Any help would be g greatly appreciated and verification for my answer.

 

[Dick]

Homework Statement

In 3D space a full vector can be represented I. All the following except
A. In Cartesian vector form
B.As a magnitude times a unit vector
C. As a Cartesian vector times a unit vector
D. As magnitude with coordinate angles

Homework Equations

The Attempt at a Solution

I say the answer is reason being I found all the other statements correct therefore I solve by elimination of variables. Any help would be g greatly appreciated and verification for my answer.

What does a vector times a vector mean? Think about that.

 

[Tiven white]

What does a vector times a vector mean? Think about that.

Is the answer c due to the fact that the vector times a vector can produce a scalar

 

[Dick]

Is the answer c due to the fact that the vector times a vector can produce a scalar

Depends on what the problem means by 'times'. If the only product you know about is the dot product, then yes, answer c is certainly a candidate for elimination.

 

[HalfLostAndSearching]

Your answer is correct. In 3D space, vectors can be represented in Cartesian vector form (x,y,z), as a magnitude (length) multiplied by a unit vector (direction), or as a combination of both (Cartesian vector multiplied by a unit vector). Using coordinate angles to represent a vector is not a common method and is not typically used in 3D space. So the correct answer is A. In Cartesian vector form.