Topic G Outline Extra Question: Answer is (5)

Solution

Given that P = 60 yrs, a = 30 AU, then

1. (M₁+M₂) P² = a³
   
   
2. (M₁+M₂) 60² = 30³
   
   
3. (M₁+M₂) 3600 = 27,000
   
   
4. (M₁+M₂) = 27,000 / 3600 = 7.5 solar masses (Ans. #5)
   

Return to Topic G Extra Question