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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 7 - Gravitation > Two starts each of one solar mass (=2×10^30kg) are approaching each other for a head on collision. When they are a distance 109km. their speeds are negligible. What is the speed with which they collide? The radius of each star is 10^4km. Assume the stars to remain undistorted until they collide. (Use the known value of G).

Two starts each of one solar mass (=2×10^30kg) are approaching each other for a head on collision. When they are a distance 109km. their speeds are negligible. What is the speed with which they collide? The radius of each star is 10^4km. Assume the stars to remain undistorted until they collide. (Use the known value of G).

How will you 'weigh the sun' that is estimate its mass? The mean orbital radius of the earth around the sun is 1.5×10^8 km.