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A ladder .AB. of weight 300 N and length...

A ladder .AB. of weight 300 N and length 5 m is lying on a horizontal surface. Its centre of gravity is at a distane of .2m. from end A.A weight of 80N is attached at end B. The work done in raising the ladder to the vertical position with end .A. in contact with the ground is,

A

500 J

B

1000 J

C

1150 J

D

1900 J

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-WORK POWER ENERGY-EXERCISE - 2
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  3. A ladder .AB. of weight 300 N and length 5 m is lying on a horizontal ...

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

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

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

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

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  11. A particle of mass 0.1 kg is subjected to a force which varies with d...

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  12. A uniform metre scale of mass 2kg is suspended from on end. If it is d...

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  13. Two sopheres whose radii are in the ratio 1:2 are moving with theier v...

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  14. A river of salty water is flowling with a velocity 2 m/sec. If the den...

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  15. When a spring is compresssed by 3 cm the potential energy stored in it...

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  16. If the kinetic energy of a body increases by 125% the percentage incre...

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  17. The kinetic energy of a body is s.K.. If one - fourth of its mass is r...

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  18. A body of mass 6 kg is under a force which causes displacement in it g...

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  19. A particle of mass 100 g is thrown verticaly upwards with the speed of...

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  20. A bullet of mass 10 gm hits a fixed target and penetrates through 8 cm...

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