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A block is being pulled by a force F on ...

A block is being pulled by a force F on a long frictionless level floor. Magnitude of the force is gradually increases from zero until the block lifts off the floor. Immediately before the block leaves the floor, its acceleration is

A

`g costheta`

B

`gcottheta`

C

`gsintheta`

D

`g tan theta`

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The correct Answer is:
B
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ALLEN -NEWTON'S LAWS OF MOTION & FRICTION-EXERCISE (O-1)
  1. Three boxes are placed in a life. Wheen acceleration of the life is 4m...

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  2. A man is standing on a weighing machine with a block in his hand. The ...

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  3. A block is being pulled by a force F on a long frictionless level floo...

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  4. A block B is tied to one end of a uniform rope R as shown. The mass of...

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  5. The pulleys and strings shown in the fig are smooth and of negligible ...

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  6. A block resting on a smooth inclined plane is acted upon by a force F ...

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  7. In the arrangement shown, the blocks of unequal masses are held at res...

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  8. A monkey weighing 10 kg climbing up a light rope and frictionless pull...

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  9. A heavy cart is pulled by a constant force F along a horizontal track ...

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  10. In arrangement shown the block A of mass 15 kg supported in equilibriu...

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  11. In the given figure, Find mass of the block A, if it remains at rest, ...

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  12. In the arrangement shown, the 2 kg block is held to keep the system at...

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  13. A string of negligible mass going over a clamped puley of mass m suppo...

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  14. Block A is moving away from the wall at a speed v and acceleration a.

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  15. In the setup shown, fird acceleration of the block C.

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  16. A block of mass 2 kg is kept on a rough horizontal floor an pulled wit...

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  17. In the figure shown a ring of mass M and a block of mass m are in equi...

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  18. A force barF=hati+4hatj acts on block shown. The force of friction act...

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  19. Block B of mass 100 kg rests on a rough surface of friction coeffcient...

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  20. A block of mass 3kg is at rest on a rough inclined plan as shown in th...

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