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A force vecF=2hati-3hatj+7hatk(N) acts o...

A force `vecF=2hati-3hatj+7hatk(N)` acts on a particle which undergoes a displacement `vecr=7hati+3hatj-2hatk`
(M). Calculate the work done by the force

A

37 J

B

`-9J`

C

49 J

D

14 J

Text Solution

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The correct Answer is:
B
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MOTION-WORK, POWER & ENERGY -Exercise - 1
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  2. The relationship between force and position is shown in the figure giv...

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  7. A block of mass M is hanging over a smooth and light pulley by a const...

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  8. A light and a heavy body have equal momenta. Which one has greater K.E

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  9. A 300 g mass has a velocity of (3hati + 4hatj) m//s at a certain inst...

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  10. A 4 kg mass and 1kg mass are moving with equal kinetic energies. The r...

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  11. If the linear momentum is increased by 50%, then KE will be increased...

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  12. A chain of mass m and length l is placed on a table with one-sixth of ...

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  13. A body of mass 2 kg is moved from a point A to a point B by an externa...

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  14. A running man has half the KE that a body of half his mass has. The ma...

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  15. A man slides down a snow covered hill along a curved path and falls 20...

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  16. The bob of a simple pendulum of length l dropped from a horizontal pos...

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  17. A block of mass m slips down an inclined plane as shown in the figure....

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  18. In the given figure, the inclined surface is smooth. The body releases...

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  19. In figure, block A is released from rest, when spring is at its natura...

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  20. A machine, which is 72 percent efficient, uses 36 joules of energy in ...

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