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A force barf=(hati-3hatj+2hatk)N moves a...

A force `barf=(hati-3hatj+2hatk)N` moves a particle from `bar r_(1)=2hati+7hatj+4hatk)m` to `(barr_(2)=(5hati+2hatj+8hatk)m`. The work done by the force is

A

18 j

B

28 j

C

38 j

D

48 j

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-WORK, POWER & ENERGY -EXERCISE - II (WORK)
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  2. A body of mass 10 kg is raised from certain depth. By the time is rais...

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  3. A bucket fillled with water weighing 20 kg is raised from a well of de...

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  4. A block of mass m is lowered with the help of a rope of negligible mas...

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  5. A force barf=(hati-3hatj+2hatk)N moves a particle from bar r(1)=2hati+...

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  6. A uniform chain of length 2 m is kept on a table such that a length of...

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  7. n identical cubes each of amss m an side I are on the horizontal surfa...

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  8. A person of mas 50 kg carryign a load of 20 kg walks up a staircase. I...

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  9. A rectangular block of dimensions 6m xx 4m xx 2m and of density 1.5 gm...

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  10. A body of mass 5 kg moving alonga straight line is accelerated from 4m...

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  11. A uniform rod of length 2m and mass 5kg is lying on a horizontal surfa...

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  12. A ladder .AB. of weight 300 N and length 5 m is lying on a horizontal ...

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  13. Force acting on a particle is (2hati+3hatj)N. Work done by the force i...

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  14. A force of (4x^(2)+3x)N acts on a particle which displaces it from x=2...

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  15. Velocity -time graph of a particle of mass 2 kg moving in a straight l...

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  16. A force of 5N is applied on a 20 Kg mass at rest. The work doen in the...

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  17. A body moves a distance of 20 m along a striaght line under the action...

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  18. The work done in lifting a body of mass 20 kg and specific gravity 3.2...

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  19. The work done in carrying a body from A to B is 20 J and from B to C i...

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  20. A locomotive of mass 'm' starts moving so that its velocity varies as ...

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