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Two vectors, lie in the xy plane. Their magnitudes are 4.5 and 7.3 units, respectively, whereas their directions are 320° and 85° measured counterclockwise from the positive x axis. What is the value of
Since ϕ is the angle between r and s, so the value of ϕ will be,Φ = 320̊ - 85̊ = 235̊Substituting 4.5 units is the magnitude of r and 7.3 units is the magnitude of s and 235̊ for the direction ϕ in the equation r . s = rs cosϕ,r . s = rs cosϕ = (4.5) (7.3) cos (235̊) = -18.84 …… (2)Rounding off to two significant figures, scalar product of two vectors will be -19.
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