1.

Find the value of lambda so that the vectors veca and vecb are perpendicular to each other. veca = 3hati+4hatj, vecb = -5hati+lambdahatj.

Answer»

Solution :If `VECA` and `VECB` are perpendicular `veca.vecb = 0`
`implies (3hati+4hatj).(-5hati+lambdahatj) = 0`
`implies -15+4lambda = 0 implies LAMBDA = 15/4`


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