Question

which of the following physical quantities is an example of cross product?

a)Work

b)Moment

c)Power

d)Momentum

Answer 1

Answer on Question #59412, Physics / Mechanics | Relativity

Which of the following physical quantities is an example of cross product?

a)Work

b)Moment

c)Power

d)Momentum

Solution:

The cross product, also called the vector product, is an operation on two vectors. The cross product of two vectors produces a third vector which is perpendicular to the plane in which the first two lie. That is, for the cross of two vectors, A and B, we place A and B so that their tails are at a common point. Then, their cross product, A x B, gives a third vector, say C, whose tail is also at the same point as those of A and B. The vector C points in a direction perpendicular (or normal) to both A and B. The direction of C depends on the Right Hand Rule.

Moment of force (or torque) is example of the cross product of the lever-arm distance vector and the force vector, which tends to produce rotation:

$$\vec {i} = \vec {r} \times \vec {F}$$

Answer: b)Moment

https://www.AssignmentExpert.com