Determine the entropy change (kJ/K) associated to the conversion of 10 kg of ice at -11 °C to steam at 121 °C.
1. An engine from a quarry vehicle used in the Build a Beach program of DEMR has a power requirement of 560 kW. Per hour of its operation, it ejects 234 MJ into its surroundings at 50 °C. If it behaves like a Carnot engine, answer the questions below.
A. How much work (MJ) is done by the engine per hour of operation?
B. What is the efficiency (%) of the engine?
C. What is the temperature (°C) of the hot reservoir?
2. Determine the entropy change (kJ/K) associated to the conversion of 10 kg of ice at -11 °C to steam at 121 °C.
3. Anna and Beth are using another rare metal, the nth metal (c = 0.600 J/g-℃), to build the 5-kg cuirass of their design. Initially, the metal is at 2250 K. It is then submerged to 10 kg of water at 15 °C. If the remaining liquid water after submerging the metal is 8.5 kg, solve for the net entropy change (kJ/K) of the system.
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