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A vector is a quantity described by size and direction.

Mathematically, the square of a vector is negative, e.g. i^2 = -1, thus a quantity whose square is negative is a vector, e.g. 5i is a vector because (5i)^2 = -25.

Q: What decscribes a vector?

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Yes, a vector can be represented in terms of a unit vector which is in the same direction as the vector. it will be the unit vector in the direction of the vector times the magnitude of the vector.

The zero vector is both parallel and perpendicular to any other vector. V.0 = 0 means zero vector is perpendicular to V and Vx0 = 0 means zero vector is parallel to V.

Vector spaces can be formed of vector subspaces.

Resultant vector or effective vector

A null vector has no magnitude, a negative vector does have a magnitude but it is in the direction opposite to that of the reference vector.

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Their economies rely heavily on exports.

Yes, a vector can be represented in terms of a unit vector which is in the same direction as the vector. it will be the unit vector in the direction of the vector times the magnitude of the vector.

NULL VECTOR::::null vector is avector of zero magnitude and arbitrary direction the sum of a vector and its negative vector is a null vector...

90 degrees

That is usually called the resultant vector.

The zero vector is both parallel and perpendicular to any other vector. V.0 = 0 means zero vector is perpendicular to V and Vx0 = 0 means zero vector is parallel to V.

The quantity "120 meters northeast" is a vector because it has both magnitude (120 meters) and direction (northeast). Scalars have magnitude only and no specific direction associated with them.

Resultant vector or effective vector

Vector spaces can be formed of vector subspaces.

A null vector has no magnitude, a negative vector does have a magnitude but it is in the direction opposite to that of the reference vector.

A scalar times a vector is a vector.

Vector resolution involves breaking down a single vector into its horizontal and vertical components, while vector addition combines two or more vectors together to form a resultant vector. They are considered opposite processes because resolution breaks a single vector into simpler components, while addition combines multiple vectors into a single resultant vector.