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A machine gun fires n bullets per second...

A machine gun fires n bullets per second and the mass of each bullet is m. If v is the speed of each bullet, then the force exerted on the machine gun is

A

`nm u `

B

`2nm u`

C

`4nm u`

D

`(nm u)/(2)`

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AAKASH INSTITUTE ENGLISH-LAWS OF MOTION-EXERCISE
  1. A ball is moving with speed 20 ms^(-2) collides with a smooth surface...

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  2. If impulse I varies time t as I(kg ms^(-1))=20t^(2)-40t. The change ...

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  3. A machine gun fires n bullets per second and the mass of each bullet i...

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  4. An initially stationary device lying on a frictionless floor explodes ...

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  5. If final momentum is equal to initial momentum of the system then

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  6. A ball is moving towards the wall as shown in diagram then momentum is...

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  7. A body of mass 5 kg is moving with velocity of v=(2hati+6hatj)ms^(-1) ...

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  8. A cart loaded with sand moving with velocity v. Sand is falling throu...

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  9. A particle of mass m strikes elastically on a wall with velocity v, at...

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  10. The average force necessary to stop a hammer with momentum p (in N-s) ...

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  11. Two blocks of mass 2 kg and 4 kg are accelerated with same acceleratio...

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  12. Three blocks of masses m(1)=4kg, m(2)=2kg, m(3)=4kg are connected with...

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  13. The tension in the string connected between blocks is

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  14. A block of mass m as shown in figure is pulled by a force 40N. The ten...

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  15. A block is stationary on a rough inclined plane. How many forces are a...

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  16. In the given arrangement, the normal force applied by block on the gro...

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  17. A book of mass 5 kg is placed on a table and it is pressed by 10 N for...

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  18. Three blocks are placed as shown in figure. Mass of A, B and C are m(1...

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  19. The value of (T(3))/(T(1)) is

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  20. A block of mass 10 kg is moving on a rough surface as shown in figure....

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