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A block of mass m is placed on a smooth ...

A block of mass m is placed on a smooth horizontal floor is attached to one end of spring. The other end of the spring is attached to fixed support. When spring is vertical it is relaxed. Now the block is pulled to wards right by a force F, which is being increased gradually. When the speing makes angle `53^(@)` with the vertical, block leaves the floor.

When the block leaves the table, the force F is :-

A

`(3mg)/(4)`

B

`(4mg)/(3)`

C

`(3mg)/(5)`

D

`(4mg)/(5)`

Text Solution

Verified by Experts

The correct Answer is:
B
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ALLEN -NEWTON'S LAWS OF MOTION & FRICTION-EXERCISE (O-2)
  1. Consider a block suspended from a light string as shown in the digure....

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  2. A block of weight 9.8N is placed on a table. The table surface exerts...

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  3. A block of mass m is suspended from a fixed support with the help of a...

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  4. A block A and wedge B connected through a string as shown. The wadge B...

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  5. Two blocks A and B of mass 2 kg and 4 kg respectively are placed on a ...

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  6. A block is kept on a rough surface and applied with a horizontal force...

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  7. A block placed on a rough horizontal surface is pushed with a force F ...

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  8. A block is placed over a plank. The coefficient of friction between th...

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  9. A block is released from rest from point on a rough inclined place of ...

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  10. In the given figure both the bocks have equal mass. When the thread is...

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  11. A block of mass m is placed on a smooth horizontal floor is attached t...

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  12. A block of mass m is placed on a smooth horizontal floor is attached t...

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  13. A block of mass m is placed on a smooth horizontal floor is attached t...

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  14. When F = 2N, the frictional force between 5 kg block and ground is

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  15. When F = 2n, the frictional force between 10 kg block 5 kg block is

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  16. The maximum F which will not cause motion of any of the blocks is

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  17. The maximum acceleration of 5 of kg block is :-

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  18. The acceleration of 10 kg block when F = 30 N is

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  19. In the figure shown ,acceraltion of is x (upwards ) Acceleration o fpu...

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  20. Velocity of there particless A.B and C varies with time t as , v(A) =(...

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