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The unit vector of a vector vecA =2hati ...

The unit vector of a vector `vecA =2hati + 4hatj` is

A

`9/sqrt20(hati+hatj)`

B

`sqrt20(2hati+3hatj)`

C

`1/sqrt20(2hati+4hatj)`

D

`9sqrt20(hati+hatj)`

Text Solution

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The correct Answer is:
C
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AAKASH INSTITUTE ENGLISH-MOCK TEST 4 -Example
  1. If vecA=2hati + 3hatj and vecB= 5hati + 7hatj, then the vector having ...

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  2. A vector is not changed if

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  3. The unit vector of a vector vecA =2hati + 4hatj is

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  4. If vecA= a hati + 0.5hatj + 0.5hatk is unit vector, then value of a w...

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  5. If a vector bar(OP) = 3hati + 3hatj is turned clockwise by an angle of...

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  6. Which one of the following quantities is a scalar ?

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  7. The resultant vector of of bar(OA) = 2hati + 3hatj + 6hatk and bar(OB)...

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  8. The magnitude of resultant vectors of two vectors given by vecA = 10ha...

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  9. The velocity vector at a point A varies with time as vecv=ahati+bthat...

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  10. The velocity varies with time as vecv = ahati + bthatj , where a and ...

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  11. vecP is resultant of vecA and vecB. vecQ is resultant of vecA and -ve...

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  12. A particle moves along the parabolic path x = y^2 + 2y + 2 in such a w...

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  13. Resultant of two vectors vecA and vecB is of magnitude P, If vecB is r...

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  14. Two vectors of equal magnitude are acting through a point. The magnitu...

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  15. The resultant of two forces acting at an angle of 150° 10 kgwt, and is...

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  16. P,Q and R are three coplanar forces acting at a point and are in equil...

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  17. Rain is falling vertically with a velocity of 3kmh^-1. A man walks in ...

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  18. Which of the following may represent the direction of vecV(AB)?

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  19. A ship A is moving Westwards with a speed of 10kmh^(-10 and a ship B 1...

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  20. A train travels 180 km at a uniform speed. If the speed had been 9 km/...

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