**Answer:**

d

**Explanation:**

Eternity because it could be culprited by the True Anomaly and the Argument of perigee

**Answer:**

∆S=Q/T

**Explanation:**

Given the general expression for entropy:

We can proceed to find the final expression.

As the temperature does not change, it can be removed from the integral, leaving:

Now, we proceed to solve the integral to have the final answer:

Answer:

Explanation : Please go through the attached documents for the step by step solution.

Please note that, The file with the diagram is the first one and it is placed first.