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Grade 12Vectors

Sir please i am immediate need of answer to question C from this list..My board exams are coming near.

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SHREYAS S SHENVI AMBE

9 Years agoGrade 12

1 Answer

Aditya Raj

9 Years ago

Using the concept of vector triple product-

ax(bxc)=(a.c)b-(a.b)c ,we get

ax(bxc)=(a.c)b-(a.b)c=(1/2)b

comparing lhs and rhs we get,

a.c=1/2 & a.b=0

So,as a,b & c are unit vectors,so their magnitude is 1 each.

|a||c|cos(@)=1/2 & |a||b|cos(@)=0

therefore angle between a and c=60 & that b/w a & b=90

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