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vikas srivastava Grade: 12
        a unit vector in xy -plane that makes an angle of 45 degree with the vector  i+j and an angle of 60 degree with the vector 3i-4j is 
6 years ago

Answers : (1)

Prudhvi teja
83 Points
										

Dear vikas


let vector b ai+bj


a.1+b.1 = 1*(2^0.5).cos45


= a+b =1


and a^2+b^2 = 1


=>(a+b)^2 - a^2-b^2 = 0


=>2ab = 0


so a=0 or b=0


so a=1,b=0


or a=0,b=1


a.3-b.4 = 5*cos60


=>3a-4b =5/2


either a=1 or b=1 doesnt suit.So there is no vector in xy-plane which satisfies given conditions


 



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Prudhvi Teja


 


 



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6 years ago
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