Question

The moment of the couple formed by the force  acting at the points (9, –1, 2) and (3, –2, 1) respectively, is

Solution

Correct option is

 

We have,  

Moment of the couple   

Where  are the position vectors of the points of application of the forces  respectively.  

 and,   

SIMILAR QUESTIONS

Q1

If  are three vectors such that  then

Q2

Let  be unit vectors such that . Which one of the following is correct?

Q3

Let  be a unit vector perpendicular to unit vectors  and if the angle between  is α, then  is

Q4

If the vectors  are such that  form a right handed system, then  is

Q5

If the area of a parallelogram whose diagonals coincide with the following pair of vectors is , then vectors are

Q6

Let A vector  satisfying 

Q7

Vectors  are inclined at an angle θ = 60o.

Q8

Let  be unit vector such that  If the angle between 

Q9

If the force represented by  is acting through the point , then its moment about the point (1, 3, 1) is 

Q10

 be three vectors. Then scalar triple product  is equal to