1.

At what angle do the two forces (P + Q) and (P – Q) act so that the resultant is sqrt(3P^(2)+Q^(2)).

Answer»

Solution :Use`R= sqrt(A^(2)+B^(2)+2AB COS Q)`
`R=sqrt(3P^(2)+Q^(2)), A=P+Q`,
`B=P-Q`
solve, `theta=60^(@)`


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