Physics

7) In which form of heat transfer is a medium not required? 8) Which law of thermodynamics tells us whether heat flows from cold to hot or in the reverse direction? 9) If 100 J of heat is added to a system that does 40 J of external work, by how much is the internal energy of that system changed? increased or decreased? 10) How much heat is required to increase the temperature of 50 g of water from 0'C to 100 C. The specific heat capacity for water is 1 cal/g .C