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The magnitude of the resultant of two ve...

The magnitude of the resultant of two vectors `vecPand vecQ` is R. It is given by

A

`R=sqrt(P^(2)+Q^(2)+2PQsintheta`

B

`R=sqrt(P^(2)+Q^(2)+2PQcostheta`

C

`R=sqrt(P^(2)+Q^(2)+PQsintheta`

D

`R=sqrt(P^(2)+Q^(2)+PQcostheta`

Text Solution

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The correct Answer is:
B
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TARGET PUBLICATION-SCALARS AND VECTORS-Evaluation Test
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  10. If hat(i), hat(j) and hat(k) are unit vectors along x,y and z-axis res...

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  11. vec(A)and vec(B) are the two vectors such that ratio their dot product...

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  12. Two vectors vec(A) and vec(B) lie in plane, another vector vec(C ) lie...

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  13. A particle acted upon by constant forces 5hat(i) + hat(j) - 2hat(k) an...

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  14. The x and y components of vectors vec(A) are 4 m and 6 m respectively...

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  15. The angel subtended by the vector A = 6hat(i) + 3hat(j) + 4hat(k) with...

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  16. A particle moves in the x-y plane under the action of a force vec(F) s...

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  17. vec(A) and vec(B) are two vectors given by vec(A)=2hat(i)+3hat(j) ...

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  18. A vector vec(A) is along the positive x-axis and its vector product w...

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  19. What is the area of the triangle formed by sides vec(A) = 2hat(i) - 3h...

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  20. The component of vector vec(A) = a(x) hat(i) + a(y) hat(j) + a(z) hat(...

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