Solve this:
Q). State the triangle law of vector addition and derive the expression to find the magnitude of resultant of two vectors of magnitude P   a n d   Q , inclined at an angle θ .

So, we have

                  R = P + Q

Now, expand A to C and draw BC perpendicular to  OC.

From triangle OCB,

             

In triangle ACB,

              

 

   

Also,

              

Magnitude of resultant:

Substituting value of AC and BC in (i), we get

              

which is the magnitude of resultant.

 Let ø be the angle made by resultant R with P. Then,

From triangle OBC,

              

which is the direction of resultant.

  • 1
correct answer kriti
  • 1

correct
  • 1
What are you looking for?