abar and bbar are two vectors such that they are inclined at 60 degree and have equal magnitude of 10 units then find (abar +b bar).c bar where cbar is another vector of same magnitude as abar and b bar making angle with 60 degree s
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Answer:
Correct option is
D
90
o
,135
o
,135
o
From polygon law, three vectors having summation zero should form, a closed polygon(triangle). Since, the two vectors are having same magnitude and the third vector is
2
times that of either of two having equal magnitude, i.e., the triangle should be right angled triangle.
Angle between A and B, α=90
o
Angle between B and C, β=135
o
Angle between A and C, γ=135
o
.
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