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If the vectors vecA=2hati+4hatj and vecB...

If the vectors `vecA=2hati+4hatj and vecB=5hati-phatj` are parallel to each other, the magnitude of `vecB` is

A

`5sqrt5`

B

`10`

C

15

D

`2sqrt5`

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A
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NCERT FINGERTIPS-PRACTICE PAPERS-Practice Paper 3
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  8. The disc of a siren revolves 600 times in one minute and it is in unis...

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  9. Which of the following is dimensionless?

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  10. Given vecF=(4hati-10hatj)and vecr=(5hati-3hatj). then torque vectau is

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  11. A man throws balls with the same speed vertically upwards one after th...

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  12. In uniform circular motion

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  13. A ball is rolled off along the edge of the table (horizontal ) with ve...

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  14. Three masses of 1kg, 6 kg and 3 kg are connected to each other with th...

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  15. A liquid of density rho flows along a horizontal pipe of uniform cross...

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  16. A chain of uniform mass m and length L is held on a frictionless table...

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  18. Kepler's second law is based on

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  19. A spaceship is launched into a circular orbit close to the Earth's sur...

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  20. A hole is drilled in a copper sheet. The diameter of the hole is 4.24 ...

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  21. Two blocks M1 and M2 having equal masses are to move on a horizontal f...

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