Home
Class 11
PHYSICS
Find the kinetic energy needed to projec...

 Find the kinetic energy needed to project a body of mass m from the surface of earth to infinity.

Text Solution

Verified by Experts

`implies` Needed kinetic energy `=1/2 m xx ( "escape speed")^2`
`=1/2 m(sqrt(2gR))^2`
`=mgR`
Promotional Banner

Topper's Solved these Questions

  • GRAVITATION

    KUMAR PRAKASHAN|Exercise Section - D NCERT Exemplar Solutions (Multiple Choice Questions (MCQs))|15 Videos

  • GRAVITATION

    KUMAR PRAKASHAN|Exercise Section - D NCERT Exemplar Solutions (MIultiple Choice Questions (More than one options) )|1 Videos

  • GRAVITATION

    KUMAR PRAKASHAN|Exercise Section - C Objective Questions (VSQs) (Answer the following questions In short :)|11 Videos

  • LAW OF MOTION

    KUMAR PRAKASHAN|Exercise (QUESTION PAPER) SECTION-D|1 Videos

Similar Questions

Explore conceptually related problems

The kinetic energy needed to project a body of mass m from the earth's surface to infinity is

If the mass of earth is M, radius R and G is universal gravitational constant then the workdone against gravity to move a body of mass 1 kg from the surface of earth to infinity will be

If g is the acceleration due to gravity on earth's surface, the gain of the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth is

Energy required to move a body of mass m from an orbit of radius 2R to 3R is

Energy required to move a body of mass m from an orbit of radius 2R to 3R is..........

Write the change in gravitational potential energy of a body lifted at height h from the surface of earth ?

If the kinetic energy of body increases then?

The gravitational potential energy of a body of mass m at the earth's surface is mgR_e . Its gravitational potential energy at a height R_e from the earth's surface will be ..... (Here R_e is the radius of earth)

Gravitational potential of a body of mass mon the surface of earth is phi , then what is gravitational potential of body of mass 2m ?

KUMAR PRAKASHAN-GRAVITATION-Section - C Objective Questions (VSQs)
  1. What is the effect of decreasing the height of a satellite orbiting ar...

    Text Solution

    |

  2. The escape velocity on the surface of earth is 11.2 km/s. What will be...

    Text Solution

    |

  3. Find the kinetic energy needed to project a body of mass m from the su...

    Text Solution

    |

  4. What is the escape velocity from a black hole ?

    Text Solution

    |

  5. As astronaut dropped a spoon from outside spacecraft will the spoon re...

    Text Solution

    |

  6. Give the name of first Indian Astronaut.

    Text Solution

    |

  7. What is the frequency of oscillation of a  pendulum mounted in a lift ...

    Text Solution

    |

  8. Distance of two planets from the sun are 10^11 m and 10^(10) m respec...

    Text Solution

    |

  9. In Bohr’s model, the atomic radius of the first orbit is r. Then, the ...

    Text Solution

    |

  10. If any satellite has kinetic energy 6 xx 10^(9)J , then what its poten...

    Text Solution

    |

  11. A satellite has potential energy -8 xx 10^(9)J, then what is its bindi...

    Text Solution

    |

  12. The ratio between Bohr radii is

    Text Solution

    |

  13. What are the factors on which escape velocity depends on ?

    Text Solution

    |

  14. The period of revolution of a satellite in an orbit becomes 8 times th...

    Text Solution

    |

  15. Why rocket does not have escape energy ?

    Text Solution

    |

  16. Why satellite does not have escape velocity ?

    Text Solution

    |

  17. What is the direction of rotation of polar satellite ?

    Text Solution

    |

  18. In what direction does earth rotate ?

    Text Solution

    |

  19. Why we can observed a whole surface of earth with the help of polar sa...

    Text Solution

    |

  20. When a body brought from infinity to r distance, its potential energy ...

    Text Solution

    |