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What is the difference between vecr,vecf...

What is the difference between `vecr,vecf` and `vecr xx vecf` ?

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PATHFINDER-MOTION IN A PLANE-QUESTION BANK
  1. The angle between force vecF =(3hati+4hatj-5hatk) unit and displacemen...

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  2. Can two non-zero vectors give result zero when they multiply each othe...

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  3. What is the difference between vecr,vecf and vecr xx vecf ?

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  4. Can three vectors not in a plane give zero resultant ? Can four vec...

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  5. The velocity of a projectile is 15m/s .At what angle to the horizontal...

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  6. Name the quantity which remains unchanged during the flight of an obli...

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  7. A bomb is dropped from an aeroplane flying horizontally with a velocit...

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  8. Is it possible to have two-dimensional motion with acceleration in onl...

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  9. The maximum range of a projectile is 2/sqrt3 times its actual range. W...

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  10. What is a null vector?

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  11. Show that vecA.vecB =1/4[abs(vecA+vecB)^2-abs(vecA-vecB)^2].

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  12. Name two quantities which would be reduced if air resistance is taken ...

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  13. The position vector of a point with time varies as athati+bt^2hatj.a a...

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  14. Two vectors of magnitude 3 and 4 give a resultant of magnitude 5 . Wha...

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  15. Two vectors of magnitude 4 and 5 give a resultant of magnitude 9 . Wha...

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  16. Mention two requirement for a given quantity to be a vector.

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  17. What is the angle between two velocity of same magnitude if the result...

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  18. State triangle law of of vector addition .

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  19. A man swims across the river which flows with a velocity of 3 km/h due...

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  20. A man swims across the river which flows with a velocity of 3 km/h due...

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