Home
Class 11
PHYSICS
A bomb, initially at rest, explodes into...

A bomb, initially at rest, explodes into several pieces. (a) Is linear momentum of the system conserved? (b) Is kinetic energy of the system conserved? Explain.

Text Solution

Verified by Experts

a. Linear momentum is conserved since there are no external forces acting on the system. The fragments go off in different directions and their vector momenta add to zero.
b. Kinetic energy is not conserved because the chemical potential energy initially in the explosive is converted into kinetic energy of the pieces of the bomb.
Promotional Banner

Topper's Solved these Questions

  • CENTRE OF MASS

    CENGAGE PHYSICS|Exercise Exercise 1.3|24 Videos

  • CENTRE OF MASS

    CENGAGE PHYSICS|Exercise Subjective|23 Videos

  • CENTRE OF MASS

    CENGAGE PHYSICS|Exercise Exercise 1.1|20 Videos

  • CALORIMETRY

    CENGAGE PHYSICS|Exercise Solved Example|13 Videos

  • DIMENSIONS & MEASUREMENT

    CENGAGE PHYSICS|Exercise Integer|2 Videos

Similar Questions

Explore conceptually related problems

The momentum of a system is conserved

Is angular momentum of a system always conserved ?

Linear momentum conservation

A shell initially at rest explodes into two pieces of equal mass, then the two pieces will

A 12 kg bomb at rest explodes into two pieces of 4 kg and 8 kg. If the momentum of 4 kg piece is 20 Ns, the kinetic energy of the 8 kg piece is

Linear Momentum Conservation

The linear momentum is conserved in

Will the momentum remain conserved if some external force acts on the system ?

The angular momentum of a system of particles is conserved

Knowledge Check

  • The momentum of a system is conserved

    A
    Always
    B
    Never
    C
    In the absence of an external force on the system
    D
    None of the above

  • A shell initially at rest explodes into two pieces of equal mass, then the two pieces will

    A
    Be at rest
    B
    Move with different velocities in different directions
    C
    Move with the same velocity in opposite directions
    D
    Move with the same velocity in same direction

  • A 12 kg bomb at rest explodes into two pieces of 4 kg and 8 kg. If the momentum of 4 kg piece is 20 Ns, the kinetic energy of the 8 kg piece is

    A
    `25" J"`
    B
    `20" J"`
    C
    `50" J"`
    D
    `40" J"`
    • CENGAGE PHYSICS-CENTRE OF MASS-Exercise 1.2
    1. A bomb, initially at rest, explodes into several pieces. (a) Is linear...

      Text Solution

      |

    2. You are standing perfectly still and then you take a step forward. Bef...

      Text Solution

      |

    3. Does the centre of mass of a rocket in free space accelerate? Explain....

      Text Solution

      |

    4. Discuss the possibility of conservation of linear momentum of a block ...

      Text Solution

      |

    5. A shell is fired from a cannon with a speed of 100 m//s at an angle 30...

      Text Solution

      |

    6. Figure shows a block A of mass 6 m having a smooth semicircular groove...

      Text Solution

      |

    7. Two friends A and B (each weighing 40 kg) are sitting on a frictionles...

      Text Solution

      |

    8. A smooth wedge of mass M rests on a smooth horizontal surface. A block...

      Text Solution

      |

    9. Two identical buggies 1 and 2 with one man in each move along parallel...

      Text Solution

      |

    10. In Fig. a man stands on a boat floating in still water. The mass of t...

      Text Solution

      |

    11. Two blocks of masses m(1) = 2 kg and m(2) = 5 kg are moving in the sam...

      Text Solution

      |

    12. An 80 kg boy and his 40 kg sister, both wearing roller blades, face ea...

      Text Solution

      |

    13. Two blocks of masses M and 3M are placed on a horizontal, frictionless...

      Text Solution

      |

    14. A pendulum bob of mass 10^-2kg is raised to a height 5xx10^-2m and the...

      Text Solution

      |

    15. A rifle man, who together with his rifle has a mass of 100 kg, stands ...

      Text Solution

      |

    16. A projectile of mass 50 kg is shot vertically upwards with an initial ...

      Text Solution

      |

    17. a. A rail road flat car of mass M can roll without friction along a st...

      Text Solution

      |

    18. a. A rail road car of mass M is moving without friction on a straight ...

      Text Solution

      |

    19. A shell of mass 2 kg moving at a rate of 4 m//s suddenly explodes into...

      Text Solution

      |

    20. A mud ball at rest explodes into three fragmennts of masses in the rag...

      Text Solution

      |