An iron horseshoe of mass 1.47 kg is taken from a furnace at 660 ◦C and dropped into 1.83 kg of water at 8.5 ◦C. If no heat is lost to the surroundings, determine the total entropy change. The specific heat of water is 4186 J/K · kg and of iron 448 J/K · kg. Answer in units of J/K.

The entropy of the system can be determined by integration from

تحرير Ep 2- the اليوم 1:33 ص Umg (۱۰ 0.05 m² of gas at 6.9 bar expands reversibly in a cylinder behind a piston according to a law PV25-C until the volume is 0.08 m². Calculate the work done by the gas and sketch the process on the P-V diagram (15 300J) ه م ده بله - -------------------------- - - - - the depth (11 1:36

A piston/cylinder arrangement contains 2 kg of ammonia at a temperature 132.45 ℃ and a pressure 5 MPa. The piston floats. Heat is added to the system until the temperature of ammonia reaches 416.37 ℃. Is this process reversible in principle? Just answer with one or two sentences, without doing any computations. Determine the change of entropy for ammonia during the process. Use both the tables and correlations. Do you expect a positive or a negative change in entropy? Please, explain [one sentence is enough].