there are two displacement vectors one of magnitude 3m and other of magnitude 4m,how should the two

Asked by  | 18th Dec, 2009, 11:50: AM

Expert Answer:

We can find the required angle, arrange the vectors accrodingly and then add.

cos θ = (R2 - F12 - F22)/(2F1F2)

(a) cos θ = (72 - 32 - 42)/(2x3x4) = 1, hence the angle between them should be 0.

(b)  cos θ = (12 - 32 - 42)/(2x3x4) = -1, hence the angle between them should be 180 degree.

(c)  cos θ = (52 - 32 - 42)/(2x3x4) = 0, hence the anlge between them should be 90 degree.

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Answered by  | 18th Dec, 2009, 06:52: PM

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