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Two stars each of one solar mass (= 2 xx...

Two stars each of one solar mass `(= 2 xx 10^(30) kg)`   are approaching each other for a head on collision. When they are a distance `10^9` km, their speeds are negligible. What is the speed with which they collide ? The radius of each star is 10^4 km. Assume the stars to remain undistorted until they collide. (Use the known value of G). 

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`2.6 xx 10^(6)` m/s
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NCERT GUJARATI-GRAVITATION-EXERCISES
  1. Acceleration due to gravity is independent of mass of the earth/mass o...

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  2. The formula –G Mm(1//r(2) – 1//r(1)) is more/less accurate than the f...

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  3. Suppose there existed a planet that went around the Sun twice as fast ...

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

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  5. If the zero of potential energy is at infinity, the total energy of an...

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  6. The energy required to launch an orbiting satellite out of earth’s gra...

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

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

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

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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 xx 10^(30) kg)   are approaching...

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  20. Two heavy spheres each of mass 100 kg and  radius 0.10 m are placed 1....

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