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the resultant of two vectors a and b is perpendicular to the vector a and its magnitude is equal to half the magnitude of vector b. the angle between a and b is
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the resultant of two vectors a and b is perpendicular to the vector a ...
Given Information:
- Resultant of vectors a and b is perpendicular to vector a.
- Magnitude of resultant is half the magnitude of vector b.
- Angle between vectors a and b is to be found.

Explanation:
- Let the vectors a and b be represented as:
- Vector a = a
- Vector b = b
- Let the resultant vector be R.
- Given that R is perpendicular to a, we have:
- R . a = 0 (dot product is zero for perpendicular vectors)
- Given that magnitude of R is half the magnitude of b, we have:
- |R| = 0.5|b|
- The resultant vector R can be expressed as:
- R = a + b
- Using the properties of vectors, we can write:
- |R|^2 = |a|^2 + |b|^2 + 2|a||b|cos(theta) (where theta is the angle between a and b)
- Substituting the given values, we get:
- (0.5|b|)^2 = |a|^2 + |b|^2 + 2|a||b|cos(theta)
- 0.25|b|^2 = |a|^2 + |b|^2 + 2|a||b|cos(theta)
- 0.25 = (|a|/|b|)^2 + 1 + 2(|a|/|b|)cos(theta)
- From the above equation, we can solve for theta using trigonometric identities.

Conclusion:
- The angle between vectors a and b can be determined using the given information and trigonometric calculations.
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