1)3 particles of equal mass M are moving on a circular path with radius r under their mutual gravitational attraction.the speed of each particle is:
a)√(GM/√2R) b)√(GM/√3R) c)√(GM/2R) d)√(GM/3R)
2)in a double star system one of mass m1 and other of mass m2 with separation d rotate about their common com.then rate of sweeps of area os star of mass m1 to that of m2 about their common com is
a)m1/m2 b)m2/m1 c)m12/m22 d)m22/m12
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