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If vec F =2 hat i + 3hat j +4hat k acts ...

If `vec F =2 hat i + 3hat j +4hat k` acts on a body and displaces it by `vec S =3 hat i + 2hat j + 5 hat k`, then the work done by the force is

A

12 J

B

20 J

C

32 J

D

64 J

Text Solution

Verified by Experts

The correct Answer is:
`(3)`
`W = vec F.vecS`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE -1 (H.W)
  1. A particle is displaced from a position (2 vec i - vec j + vec k) metr...

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  2. A particle moves along the X-axis from x=0 to x=5 m under the influenc...

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  3. If vec F =2 hat i + 3hat j +4hat k acts on a body and displaces it by ...

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  4. A force of 1200 N acting on a stone by means of a rope slides the ston...

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  5. A man weighing 80 kg climbs a staircase carrying a 20 kg load. The st...

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  6. The work done by a force vec F = 3 hat i -4hat j +5hat k displaces the...

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  7. A force vec F=(6 hati -8 hatj)N, acts on a particle and displaces it o...

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  8. A lawn roller is pulled along a horizontal surface through a distance ...

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  9. An object is displaced from position vector vec(r(1)) = (2hat(i) + 3 h...

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  10. When momentum of a body increases by 200% its KE increases by

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  11. A river of salty water is flowing with a velocity 2m//sec. If the dens...

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  12. If the kinetic energy of a body increases by 125%, the percentage incr...

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  13. A shot is fired at 30^@ with the vertical from a point on the ground w...

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  14. A body starts from rest and is acted on by a constant force. The ratio...

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  15. The mass of a simple pendulum bob is 100 gm. The length of the pendulu...

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  16. A body starts from rest and moves with uniform acceleration. What is t...

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  17. A liquid of specific gravity 0.8 is flowing in a pipe line with a spee...

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  18. A 60 kg boy lying on a surface of negliguble friction throws horizonta...

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  19. Two stones of masses m and 2 m are projected vertically upwards so as ...

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  20. A neutron, one of the constituents of a nucleus, is found to pass two ...

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