Home
Class 11
PHYSICS
A person fire bullet of 40 g w ith speed...

A person fire bullet of 40 g w ith speed of 1200 m /s from his rifle. If rifle can w ithstant maximum recoil force of 144 N. How many bullet he can fire every second ?

A

1

B

2

C

3

D

4

Text Solution

Verified by Experts

The correct Answer is:
C
`F= 144 N`
`m= 40 g = 40 xx 10^(-3) kg`
`v= 1200 m//s`
Momentum of one buller = mv
Let persone fire n bullet every second
Total momentum of n bullet
`=nmv `
recoil force
Now F= mnv
`n=(F)/(m v) = (144)/( 40 xx 10^(-3) xx 1200)`
`= 3`
Person can fire 3 bullet every second
Promotional Banner

Topper's Solved these Questions

  • LAW OF MOTION

    KUMAR PRAKASHAN|Exercise SECTION-F (QUESTIONS FROM MODULE)|22 Videos

  • LAW OF MOTION

    KUMAR PRAKASHAN|Exercise (QUESTION PAPER) SECTION-A|5 Videos

  • LAW OF MOTION

    KUMAR PRAKASHAN|Exercise SECTION-D(NCERT EXEMPLAR SOLUTIONS)|42 Videos

  • GRAVITATION

    KUMAR PRAKASHAN|Exercise QUESTIONS PAPER Section - D|1 Videos

  • MACHANICAL PROPERTIES OF SOLIDS

    KUMAR PRAKASHAN|Exercise QUESTION PAPER|11 Videos

Similar Questions

Explore conceptually related problems

A machine gun fires bullets of 50gm at the speed of 1000m/sec. If an average force of 200N is exerted on the gun, the maximum number of bullets fired per minute is:

A soldier fires bullets, each of mass 50 g, from his automatic rifle with a velocity of 1000 m/s. If he can bear a maximum force of 200 N on his shoulder, find the number of bullets which he can fire in a second.

A bullet of mass 20g fired from a rifle is found to cover the distance of 30m in 4 s. Assuming that the speed of the bullet to be constant, find its kinetic energy.

A rocket is fired vertically with a speed of 5 km s^(-1) from the earth’s surface. How far from the earth does the rocket go before returning to the earth ? Mass of the earth = 6.0 × 10^(24) kg, mean radius of the earth = 6.4 xx 10^(6) m , G = 6.67 xx 10^(-11) " N "m^(2) kg^(-2) .

A Hose pipe which disposes water at the speed of 20 m//s . A very high building is no fire. Safe distance from building on ground is 8m . How high can this water strike the building?

A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 km s^(–1) . If 20% of its initial energy is lost due to martian atmospheric resistance, how far will the rocket go from the surface of mars before returning to it ? Mass of mars = 6.4 xx 10^(23) kg, radius of mars = 3395 km, G = 6.67 xx 10^(-11) N m^(2) Kg^(-2) .

Comprehension # 9 In James bond movie ''The Spy Who Loved Me'', James skied down a snowy slope in an attempt to escape from the killer. Unfortunately, the killer had a higher skiing speed than James's, they are 40m//s and 40m//s respectively. Now consider an alternative version of the movie. James noted that he and the killer carried the same kind of rifle' and estimated that their masses M (including body mass, skis, weapon, backpack, ect) were about the same. Recalling high school physics knowledge, James realised that each time he fired his weapon back at the killer, his momentum would change, whereas when the killer fired, the killer's momentum would also change. Evergy time James fired a bullet, the killer would fire back accordingly. Assume that all bullets missed their targets (otherwise this exercise would terminte). Given M = 100 kg , mass and the muzzle velocity of a bullet are m = 0.02 kg and v = 500 m//s respectively How many bullets James had to fire in order to assure that the killer couldn't catch up with him ?

A bullet of mass m and charge q is fired towards a solid uniformly charge sphere of radius R and total charge +q. If it strikes the surface of sphere with speed u, find the minimum value of u so that it can penetrate through the sphere. (Neglect all resistance force or friction acting on bullet except electrostatic forces)

KUMAR PRAKASHAN-LAW OF MOTION-SECTION -E(MULTIPLE CHOICE QUESTIONS) (MCQS)
  1. Three blocks A, B and C of m asses 4kg, 2kg and lkg respectively are i...

    Text Solution

    |

  2. A block A of m ass rests on a horizontal table. A lig h t strin g conn...

    Text Solution

    |

  3. A plank w ith a box on it atone end is gradually raised about the othe...

    Text Solution

    |

  4. A particle moves so th at its p o sitio n vector is omega Where is a...

    Text Solution

    |

  5. What is the minimum velocity with which a body of mass m must enter a ...

    Text Solution

    |

  6. A rigid ball of mass m strikes a rigid wall at 60° and gets reflected...

    Text Solution

    |

  7. A bullet of m ass 10 g m oving horizontal w ith a velocity of 400 ms^(...

    Text Solution

    |

  8. A stationary object is divided into two fragment of mass 2M and 3M. To...

    Text Solution

    |

  9. A cyclist on a level road takes a sharp circular tu rn of rad iu s 3 m...

    Text Solution

    |

  10. When forces F(1), F(2) and F(3) are acting on a particle of mass m suc...

    Text Solution

    |

  11. When forces F(1), F(2) and F(3) are acting on a particle of mass m suc...

    Text Solution

    |

  12. Two masses m(1) = 4.8 kg and m(2) = 5 kg tied to a string are hanging ...

    Text Solution

    |

  13. A block rests on a rough inclined plane making an angle of 30° with th...

    Text Solution

    |

  14. A person fire bullet of 40 g w ith speed of 1200 m /s from his rifle. ...

    Text Solution

    |

  15. A player caught a cricket ball of m ass 150 g moving at a rate of 20 m...

    Text Solution

    |

  16. A mass ‘m’ is supported by a massless string wound around a uniform ho...

    Text Solution

    |

  17. Given in the figure are two blocks A and B of weight 20 N and 100 N re...

    Text Solution

    |

  18. Two masses m(1) = 5 kg and m(2) = 10 kg, connected by an inextensible ...

    Text Solution

    |

  19. Which one of the following statem ents is incorrect?

    Text Solution

    |

  20. A block of mass m is place on a sm ooth inclined wedge ABC of inclinat...

    Text Solution

    |