1. The problem statement, all variables and given/known data Using the viral theorem, the heat capacity of a star is given as C=-3*k/2. Using this, I need to calculate the entropy of a star in terms of the average temperature T, then in terms of U (total energy). 2. Relevant equations dS=C*dT/T 3. The attempt at a solution To solve for S, I integrated getting S=-(3/2)*k*ln(tf/ti)+C. How do I solve this for S? This function is undefined when Temperature is 0... Thanks in advance!