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Let us assume that our galaxy consists o...

Let us assume that our galaxy consists of 2.5 `× 10^(11)` stars each of one solar mass. How long will a star at a distance of 50,000 ly from the galactic centre take to complete one revolution? Take the diameter of the Milky Way to be `10^(5)` ly.

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`3.54 ×x 10^(8)` years.
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NCERT TAMIL-GRAVITATION-EXERCISES
  1. Suppose there existed a planet that went around the Sun twice as fast ...

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  2. Io, one of the satellites of Jupiter, has an orbital period of 1.769 d...

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  3. Let us assume that our galaxy consists of 2.5 × 10^(11) stars each of ...

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  4. The kinetic energy of a satellite is 2 MJ. What is the total energy of...

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  5. The energy required to remove an electron in a hydrogen atom from n=10...

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  6. Does the escape speed of a body from the earth depend on (a) the mass ...

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  7. A comet orbits the sun in a highly elliptical orbit. Does the comet ha...

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  8. Which of the following symptoms is likely to afflict an astronaut in s...

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  9. In the following two exercises, choose the correct answer from among t...

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  10. For the above problem, the direction of the gravitational intensity at...

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  11. A rocket is fired from the earth towards the sun. At what distance fro...

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  12. How will you ‘weigh the sun’, that is estimate its mass? The mean orbi...

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  13. A saturn year is 29.5 times the earth year. How far is the saturn from...

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  14. A body weighs 63 N on the surface of the earth. What is the gravitatio...

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  15. Assuming the earth to be a sphere of uniform mass density, how much wo...

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  16. A rocket is fired vertically with a speed of 5 km s^(-1) from the eart...

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  17. The escape speed of a projectile on the earth’s surface is 11.2 km s^(...

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  18. A satellite orbits the earth at a height of 400 km above the surface. ...

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  19. Two stars each of one solar mass (= 2 × 10^(30) kg) are approaching ea...

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  20. Two heavy spheres each of mass 100 kg and radius 0.10 m are placed 1.0...

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