Two identical thermodynamic systems, one at T1 and the other at ...

[wenmo]

Two identical thermodynamic systems, one at T1 and the other at T2, are placed in thermal contact. When they reach thermal equilibrium, what is true about the final temperature?
  1.Tfinal > (T1 + T2)
  2.Tfinal = (T1 + T2)
  3.Tfinal < (T1 + T2)
  4.Not enough information

Question 2

To have your coffee be as hot as possible when you drink it later, when should you add room temperature cream?
  1.As soon as the coffee is served.
  2.Just before you drink it.
  3.Either; it makes no difference.
  4.It is impossible to determine.

[jennafosdick]

Answer to Question 1

2

Answer to Question 2

1

[wenmo]

TYSM

[Liddy]

Excellent