Question

1. Suppose our sun had 4 times its present mass but the earth orbited it at the same distance as it 5) presently does. What would be the length of the year on the earth under those conditions?

   A) twice as long as the present year B) 1/2 as long as the present year C) the same as the present year D) 1/4 as long as the present year

2. E) four times as long as the present year

Show the solution. I know the answer is B.

Answer 1

For earth sun system, we know that the required centripetal force to the earth is provided by the gravitational force of sun .

Therefore:

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