f two unit vectors AH and BH are added, the resultant has the magnitude equal to √3. If AH is subtracted from BH, theresultant will have the magnitude
Question
If two unit vectors AH and BH are added, the resultant has the magnitude equal to . If AH is subtracted from BH, the resultant will have the magnitude:
Solution
Given that AH and BH are unit vectors, their magnitudes are both 1.
When two vectors are added, the magnitude of the resultant vector is given by the formula:
√[(AH)^2 + (BH)^2 + 2(AH)(BH)cosθ]
where θ is the angle between the two vectors.
Given that the magnitude of the resultant vector when AH and BH are added is √3, we can substitute the known values into the formula:
√3 = √[(1)^2 + (1)^2 + 2(1)(1)cosθ]
Solving this equation gives cosθ = -1/2. This means that the angle between the vectors is 120 degrees (or 2π/3 radians).
When one vector is subtracted from another, the magnitude of the resultant vector is given by the formula:
√[(AH)^2 + (BH)^2 - 2(AH)(BH)cosθ]
Substituting the known values into this formula gives:
Resultant magnitude = √[(1)^2 + (1)^2 - 2(1)(1)(-1/2)]
Solving this equation gives a resultant magnitude of √3.
Therefore, if AH is subtracted from BH, the resultant will have a magnitude of √3.
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