Chapter 6, Problem 6.43P

A 300-lb iron casting, initially at 1050°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb · °R, and 0.45 Btu/lb · °R, respectively. (a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. Tf = i °F (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. O = i Btu/°R Touthoolk ond Medie

A 300-lb iron casting, initially at 600°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb · °R, and 0.45 Btu/lb · °R, respectively. (a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. Tf= i °F (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. O = i Btu/°R

A gas undergoes isobaric expansion at 0.05 bar from 0.1 m 3 to 1.0m 3 when 2.0 KiloJoules of heat is applied to it. Which of the following is true regarding the work, heat and the change in internal energy involved in this change (all quantities in KiloJoules)? A. +4.5; -2.0; +2.5 B. +4.5; +2.0; +6.5 C. -4.5; -2.0; -6.5 D. -4.5; +2.0; -2.5

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Water vapor is cooled in a closed, rigid tank from T1 = 360°C and p1 = 100 bar to a final temperature of T2 = 320°C. Determine the final specific volume, v2, in m/kg, and the final pressure, p2, in bar. Step 1 Determine the final specific volume, vz, in m/kg. V2= i m/kg Save for Later Attempts: 0 of 3 used Submit Answer Using multiple attempts will impact your score. 10% score reduction after attempt 1 Step 2 The parts of this question must be completed in order. This part will be available when you complete the part above.

Nitrogen undergoes an adiabatic process, the pressure volume relationship given as p = (5/V)+1.5 where is in bar and V is in m³. During the process the volume changes from 1.5 x 108 mm3 to 0.05 m³ and the system takes 45 kJ of heat. Determine (i) Work done (i) Work done (ii) Change in internal energy (iii) Final pressure of the gas, if the initial pressure is 1 bar (iv) Final temperature of gas, if the initial temperature is 80°C (v) mass (vi) Change in enthalpy. Gas Molecular weight (М) (kJ/kg K) (kJ/kg K) Air 28.97 1.005 0.718 Oxygen Nitrogen Hydrogen Carbon monoxide 32 0.920 0.660 28 1.046 0.754 2 14.40 10.40 28 1.046 0.754

Nitrogen undergoes an adiabatic process, the pressure volume relationship given as p = (5/V)+1.5 where is in bar and V is in m3. During the process the volume changes from 1.5 x 108 mm3 to 0.05 m3 and the system takes 45 kJ of heat. Determine (i) Work done (i) Work done (ii) Change in internal energy (iii) Final pressure of the gas, if the initial pressure is 1 bar (iv) Final temperature of gas, if the initial temperature is 80°C (v) mass (vi) Change in enthalpy .

Carbon Dioxide is contained in a piston-cylinder assembly and undergoes a cycle made of the fol- lowing processes: • Process 1-2: Constant volume from 1 bar, 300 K to 600 K • Process 2–3: Polytropic expansion with n=k until P3 = P1 • Process 3-1: Isobaric compression (a) Sketch the cycle on p-v and T-v coordinates (b) Determine the work and heat transfer in each process, in kJ/kg (c) Determine the type of cycle that this is. If it is a power cycle, compute the thermal efficiency. Otherwise, compute the coefficient of performance for a heat pump cycle.

Oxygen undergoes an adiabatic process, the pressure volume relationship given as p = (5/V)+1.5 where is in bar and V is in m3. During the process the volume changes from 1.5 x 108 mm3 to 0.05 m3 and the system takes 45 kJ of heat. Determine (i) Work done (ii) Change in internal energy (iii) Final pressure of the gas, if the initial pressure is 1 atm (iv) Final temperature of gas, if the initial temperature is 80°C