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A bullet of mass 0.01 kg is fired horizo...

A bullet of mass 0.01 kg is fired horizontally into a 4 kg wooden block at rest on a horizontal surface. The coefficient of the kinetic friction between the block and the surface is 0.25. the bullet gets embedded in the block and the combination moves 20 m before coming to rest. With what speed did the bullet strike the block ?

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MODERN PUBLICATION-Friction-Exercise
  1. A block of mass 15 kg is placed on a long trolley. The coefficient of ...

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  2. A box is lying on the floor of a moving train and the coefficient of f...

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  3. A bullet of mass 0.01 kg is fired horizontally into a 4 kg wooden bloc...

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  4. A horizontal force of 12 kgf pushes a block weighing 5 kgf against a v...

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  5. A horizontal force of 12 kgf pushes a block weighing 5 kgf against a v...

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  6. A chain of mass M and length L is placed on a table, such that only a ...

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  7. A force of 98 N is just able to move a body weighing 45 kgf on rough h...

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  8. A body placed on a rough inclined plane just begins to slide, when the...

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  9. Calculate the force required to move a train of 2000 quintals up on in...

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  10. An aeroplane requires for take off a speed of 80km h^(-1), the run on ...

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  11. What is friction?

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  12. Define limiting factor.

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  13. Which of the following is a self adjusting force?

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  14. What is the unit of coefficient of limiting friction?

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  15. Why is it difficult to walk on sand?

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  16. Is a large brake on a bicycle wheel more effective than small one ? Ex...

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  17. It is difficult to move a cycle along a road with its brakes on. Why?

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  18. Proper inflation of tyres saves fuel. this is because:

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  19. Why are lubricants used in machines ?

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  20. Which of the following is not used to reduce friction

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