7.20 Two stars each of one solar mass ( ) are approaching each other for a head on…

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

7.20 Two stars each of one solar mass (

=2 \times 10^{30} \mathrm{~kg}

) are approaching each other for a head on collision. When they are a distance

10^{9} \mathrm{~km}

, their speeds are negligible. What is the speed with which they collide ? The radius of each star is

10^{4} \mathrm{~km}

. Assume the stars to remain undistorted until they collide. (Use the known value of

G