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Naba Ansari Grade: 11
        two vectors A and B have magnitude 2 and 1 respectively. if the angle between A and B is 60 degree then the vector A/2-B is 
7 years ago

Answers : (2)

Sona Srivastava
38 Points
										

A/2-B = (A/2) + (-B)


R = √((A/2) 2 +B2 + 2(A/2)BCos(120))


A/2 = 1


B = 1

Cos120 = -1/2


R = 1
AT AN ANGLE OF = TAN-1 ((ASin60)/(B-ACos60))
AT AN ANGLE OF 90° FROM (-B) OR B

7 years ago
AskiitiansExpert Abhinav Batra
25 Points
										

Dear Naba


Given |A|=2 |B|=1


angle between A and B =60


Now call vector A/2 as C


|C|=|A|/2=1


and angle between B and C will be the same as that between A and B


|C-B|=√|c|2 + |B|2 -2|C||B|cos 60°


        =√1+1-1=1


As it is clear from the diagram C-B will be along angle bisector of -B and C so angle between C and A=60°


ALL THE BEST


Abhinav Batra


874_14504_Untitled.jpg

7 years ago
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