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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 3 \sqrt{3} . If AH is subtracted from BH, the resultant will have the magnitude:

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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.

This problem has been solved

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