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The value of the sum of two vectors vecA...

The value of the sum of two vectors `vecA` and `vecB` with `theta` as the angle between them is

A

`sqrt(A^(2)+B^(2)+2ABcos theta)`

B

`sqrt(A^(@)-B^(2)+2ABcostheta)`

C

`sqrt(A^(@)+B^(2)-2ABsintheta)`

D

`sqrt(A^(2)+B^(2)+2ABsintheta)`

Text Solution

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The correct Answer is:
A
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ERRORLESS -VECTORS-Exercise
  1. For the figure shown .

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  2. Let vecC=vecA+vecB

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  3. The value of the sum of two vectors vecA and vecB with theta as the an...

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  4. The following sets of three vectors act on a body. Whose resultant can...

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  5. When three forces of 50 N, 30 N and 15 N act on body, then the boy is

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  6. The sum of two forces at a point is 16N. if their resultant is normal...

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  7. If vector P, Q and R have magnitude 5,12,and 13 units and vec(P)+vec(Q...

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  8. The resultant of two vector A and B is at right angles to A and its ma...

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  9. What vector must be added to the two vectors hati-2hatj+2hatk and 2hat...

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  10. What is the angle between vecP and the resultant of (vecP+vecQ) and (v...

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  11. The resultant of vecP and vecQ is perpendicular to vecP. What is the a...

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  12. Maximum and minimum magnitudes of the resultant of two vectors of magn...

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  13. The resultant of two vectors vec(P) and vec(Q) is vec(R ). If the magn...

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  14. Two forces F(1) and F(2) are acting on a body. One force is double tha...

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  15. Given that vecA+vecB=vecC and that vecC is | to vecA. Further if |vecA...

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  16. A body is at rest under the action of three forces, two of which are v...

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  17. A plane is revolving around the earth with a speed of 100 km/hr at a c...

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  18. What displacement must be added to the displacement 25hat(i)-6hat(j)m ...

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  19. A body moves due East with velocity 20 km//hour and then due North wit...

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  20. The magnitudes of vectors vecA,vecB and vecC are 3,4 and 5 units respe...

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