Home
Class 12
PHYSICS
The distance between centre of the earth...

The distance between centre of the earth and moon is 384000 km . If the mass of the earth is `6xx10^(24) kg` and `G=6.66xx10^(-11)Nm^(2)//kg^(2)`. The speed of the moon is nearly

A

1 km/s

B

4 km/s

C

8 km/s

D

11.2 km/s

Text Solution

Verified by Experts

The correct Answer is:
a
`v_(c)=sqrt((GM)/(r))=sqrt((4xx10^(14))/(3.84xx10^(8)))=sqrt(10^(6))=1km//s`
Promotional Banner

Topper's Solved these Questions

  • ELECTROSTATICS

    NIKITA PUBLICATION|Exercise Multiple Choice Questions|458 Videos

  • INTERFERENCE AND DIFFRACTION

    NIKITA PUBLICATION|Exercise MULTPLE CHOICE QUESTIONS|333 Videos

Similar Questions

Explore conceptually related problems

A satellite revolves around the earth at a height of 1000 km. The radius of the earth is 6.38 xx 10^(3) km. Mass of the earth is 6xx10^(24)kg and G=6.67xx10^(-14)"N-m"^(2)kg^(-2) . Determine its orbital velocity and period of revolution.

An artificial satellite revolves round the earth at a height of 1000 km . The radius of the earth is 6.38xx10^(3)km . Mass of the earth 6xx10^(24)kg,G=6.67xx10^(-11)Nm^(2)kg^(-2) . Find the orbital speed and period of revolution of the satellite.

Find the distance of a point from the earth's centre where the resultant gravitational field due to the earth and the moon is zero. The mass of the earth is 6.0xx10^(24)kg and that of the moon is 7.4xx10^(22)kg . The distance between the earth and the moon is 4.0xx10^(5)km .

The period of moon around the earth is 27.3 days and radius of the orbit is 3.9 xx 10^(5) km . G=6.67 xx 10^(-11) Nm^(-2)kg^(-2) , find the mass of the earth.

A satellite of mass 2000 kg is revolving around the earth in a circular orbit of radius 4xx10^(4) km. The gravitational force exerted by the satellite on the earth is ________. [Mass of the earth = 6xx10^(24)kg, G=6.67xx10^(-11)Nm^(2)//kg^(2) ]

Find the distance of a point from the earth's centre where the resultant gravitational field due to the earth and the moon is zero The mass of the earth is 6.0 xx 10^(24)kg and that of the moon is 7.4 xx 10^(22)kg The distance between the earth and the moon is 4.0 xx 10^(5)km .

Find the distance of a point from the earth's centre where the resultant gravitational field due to the earth and the moon is zero. The mass of the earth is 6.0xx10^24 kg and that of the moon is 7.4x10^22 kg. The distance between the earth and the moon is 4.0xx10^5km .

The time period of revolution of moon around the earth is 28 days and radius of its orbit is 4xx10^(5) km. If G=6.67xx10^(-11) Nm^(2)//kg^(2) then find the mass of the earth.

NIKITA PUBLICATION-GRAVITATION-Multiple Choice Questions
  1. The escape velocities on the two planets of denities rho(1) and rho(2)...

    Text Solution

    |

  2. How much energy will be needed for a body of mass 100kg to escape from...

    Text Solution

    |

  3. The distance between centre of the earth and moon is 384000 km . If th...

    Text Solution

    |

  4. When a body id lifted from surface of earth height equal to radius of ...

    Text Solution

    |

  5. A planet has twice the radius but the mean density is 1/4 th as compar...

    Text Solution

    |

  6. The masses of two planets are in the ratio 1 : 2. Their radii are in t...

    Text Solution

    |

  7. The value of gravitational acceleration at a height equal to radius of...

    Text Solution

    |

  8. The ratio of acceleration due to gravity at a height 3 R above earth's...

    Text Solution

    |

  9. Find the binding energy of a satellite of mass m in orbit of radius r...

    Text Solution

    |

  10. The gravitational acceleration on the surface of earth of radius R and...

    Text Solution

    |

  11. The dimensions of universal gravitational constant are :-

    Text Solution

    |

  12. If the distance between the earth and the sun becomes 1//4th of its pr...

    Text Solution

    |

  13. The densities of two planets are in the ratio of 2 : 3 and their radii...

    Text Solution

    |

  14. The gravitational potential due to the earth is minimum at

    Text Solution

    |

  15. The earth rotates about its own axis, then the value of acceleration d...

    Text Solution

    |

  16. The time period 'T' of the artificial satellite of earth depends on th...

    Text Solution

    |

  17. According the Kepler's law, the areal velocity of a planet around the ...

    Text Solution

    |

  18. If the earth stops rotating, then the weight of an object at the north...

    Text Solution

    |

  19. The escape velocity from the earth is 11 km//s. The escape velocity fr...

    Text Solution

    |

  20. A rocket is launched vertical from the surface of the earth of radius ...

    Text Solution

    |