Home
Class 12
PHYSICS
The variation in the speed of the planet...

The variation in the speed of the planet in their orbits about the sun can be explained on the basic of the conservation of :-

A

Angular kinetic energy

B

Linear momentum

C

Angular momentum

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • RACE

    ALLEN |Exercise Basic Maths (Properties of Matter & Fluid Mechanics)(Elasticity)|20 Videos

  • RACE

    ALLEN |Exercise Basic Maths (Properties of Matter & Fluid Mechanics)(Fluid Dynamics + Viscosity)|20 Videos

  • RACE

    ALLEN |Exercise Basic Maths (ROTATIONAL MOTION)|71 Videos

  • NEWTONS LAWS OF MOTION

    ALLEN |Exercise EXERCISE-III|28 Videos

  • SIMPLE HARMONIC MOTION

    ALLEN |Exercise Example|1 Videos

Similar Questions

Explore conceptually related problems

Does speed of planet remain constant in an orbit?

Assertion : For circular orbits, the law of periods is T^(2) prop r^(3) , where M is the mass of sun and r is the radius of orbit. Reason : The square of the period T of any planet about the sun is proportional to the cube of the semi-major axis a of the orbit.

Obtain the frequency of revolution of the electron in its circular orbit. Does the answer depend on the speed of the electron? Explain.

A planet is revolving around the sun in an elliptical orbit. Which out of the following remains constant.

Spacemen Fred's spaceship (which has negligible mass) is in an elliptical orbit about planet Bob. The minimum distance between the spaceship and the planet is R, the maximum distance between the spaceship and the planet is 2R. At the point of maximum distance, spaceman fred is traveling at speed v_(0) . he then fires his thrusters so that he enters a circular orbit of radius 2R. what is his new speed?

The principle of 'parallax' in section 2.3.1 is used in the determination of distances of very distant starts. The baseline AB is the line joining the Earth's two locations six months apart in its orbit around the Sun. That is, the baseline is about the diameter of the Earth's orbit = 3xx10^(11)m . However, even the nearest stars are so distant that with such a long baseline, they show parallax only of the order of 1" (second) of arc or so. A parsec is a conventent unit of length on the astronomical scale. It is the distance of an object that will show a parallax of 1" (second of arc) from opposite ends of a baseline equal to the distance from the Earth to the Sun. How much is a parsec in terms of metres ?

A ballon filled with helium rises against gravity increasing its potential energy . The speed of thee ballon also increases as it rises . How do you reconcile this with the law of conservation of mechanical energy ? You can neglect viscous drag of air and assume that density of air is constant .

Two stars bound together by gravity orbit othe because of their mutual attraction. Such a pair of stars is referred to as a binary star system. One type of binary system is that of a black hole and a companion star. The black hole is a star that has cullapsed on itself and is so missive that not even light rays can escape its gravitational pull therefore when describing the relative motion of a black hole and companion star, the motion of the black hole can be assumed negligible compared to that of the companion. The orbit of the companion star is either elliptical with the black hole at one of the foci or circular with the black hole at the centre. The gravitational potential energy is given by U=-GmM//r where G is the universal gravitational constant, m is the mass of the companion star, M is the mass of the black hole, and r is the distance between the centre of the companion star and the centre of the black hole. Since the gravitational force is conservative. The companion star and the centre of the black hole, since the gravitational force is conservative the companion star's total mechanical energy is a constant. Because of the periodic nature of of orbit there is a simple relation between the average kinetic energy ltKgt of the companion star Two special points along the orbit are single out by astronomers. Parigee isthe point at which the companion star is closest to the black hole, and apogee is the point at which is the farthest from the black hole. Q. For circular orbits the potential energy of the companion star is constant throughout the orbit. if the radius of the orbit doubles, what is the new value of the velocity of the companion star?

Two stars bound together by gravity orbit othe because of their mutual attraction. Such a pair of stars is referred to as a binary star system. One type of binary system is that of a black hole and a companion star. The black hole is a star that has cullapsed on itself and is so missive that not even light rays can escape its gravitational pull therefore when describing the relative motion of a black hole and companion star, the motion of the black hole can be assumed negligible compared to that of the companion. The orbit of the companion star is either elliptical with the black hole at one of the foci or circular with the black hole at the centre. The gravitational potential energy is given by U=-GmM//r where G is the universal gravitational constant, m is the mass of the companion star, M is the mass of the black hole, and r is the distance between the centre of the companion star and the centre of the black hole. Since the gravitational force is conservative. The companion star and the centre of the black hole, since the gravitational force is conservative the companion star's total mechanical energy is a constant. Because of the periodic nature of of orbit there is a simple relation between the average kinetic energy ltKgt of the companion star Two special points along the orbit are single out by astronomers. Parigee isthe point at which the companion star is closest to the black hole, and apogee is the point at which is the farthest from the black hole. Q. Which of the following prevents the companion star from leaving its orbit and falling the black hole?

ALLEN -RACE-Basic Maths (GRAVITATION)
  1. For a satellite to be geo-stationary, which of the following are essen...

    Text Solution

    |

  2. Statement-1:A person feels weightlessness in an artificial satellite o...

    Text Solution

    |

  3. Statement-1: Moon cannot be used as a satellite for communication. S...

    Text Solution

    |

  4. if suddenly the gravitational force of attraction between earth and a ...

    Text Solution

    |

  5. The kinetic energy needed to project a body of mass m from the earth's...

    Text Solution

    |

  6. The change in the value of g at a height h above the surface of the ea...

    Text Solution

    |

  7. The height at which the acceleration due to gravity becomes g/9 in ter...

    Text Solution

    |

  8. Two bodies of masses m and 4m are placed at a distance r. the gravitat...

    Text Solution

    |

  9. Gravitational force between a point mass m and M separated by a distan...

    Text Solution

    |

  10. How much below the surface of the earth does the acceleration due to g...

    Text Solution

    |

  11. The eccentricity of the earth's orbit is 0.0167, the ratio of its maxi...

    Text Solution

    |

  12. A ball of mass m is fired vertically upwards from the surface of the e...

    Text Solution

    |

  13. A thin of length L is bent to form a semicircle. The mass of rod is M....

    Text Solution

    |

  14. Figure showns a planet in an elliptical orbit around the sun S. Where ...

    Text Solution

    |

  15. When a body is taken from the equator to the poles, its weight

    Text Solution

    |

  16. The change in the gravitational potential energy when a body of a mass...

    Text Solution

    |

  17. The variation in the speed of the planet in their orbits about the sun...

    Text Solution

    |

  18. The radii of circular orbits of two satellite A and B of the earth are...

    Text Solution

    |

  19. A satellite is moving around the earth's with speed v in a circular or...

    Text Solution

    |

  20. A small body of mass m falls to the earth from infintie distance away....

    Text Solution

    |