11 kg of steel has an original temperature of 210°C. If gains heat to the value of 710 kJ, what is the final temperature in °C? Specific heat of steel is 450 J/kg K. The final temperature in °C
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- 2-A cooling machine has a maximum cooling capacity of 88 kW. The temperature of the freezer at which the cooling machine absorbs heat is 1 °C and the room temperature to which it gives off heat is 28 °C. Which of the following is the heat given by the cooling machine to the room? A) 90,32 kW B) 26,49 kW C) 96,67 kW D) 80,11 kW E) 12,48 kW 3 - A) – 0,5364 kJ/kgK B) – 0,3826 kJ/kgK C) – 0,1492 kJ/kgK D) – 0,3435 kJ/kgK E) – 1,4163 kJ/kgKKindly determine the following For the process, determine (a) the work, (b) Q, and (c) S.Five cubic meter of nitrogen are heated at constant volume so that the pressure changes from 276 kPa abs to 1375 kPa gage, For nitrogen, R= 0.296 kJ/kg-K and Cp= 1.039 kJ/kg-K. Find the transferred heat. Choices: (a. 20,515 kJ; b. 17,835kJ; c.21,066kJ; d.15,065 kJ)
- A gas is compressed from an initial volume of 5.75 LL to a final volume of 1.24 LL by an external pressure of 1.00 barbar . During the compression, the gas releases 125 JJ of heat. What is the change in internal energy of the gas?4kg of air contained in a piston-cylinder apparatus at 1 bar. 40°c is compressed isothermally untill the pressure is 7 bar. Determine a) the workdone b) the direction of the work c) the internal energy change d) the heat transferIf an ideal gas undergoes a process where the change in enthalpy (Δh) is 424 kJ/kg, and the change in internal energy (ΔU) is 320 kJ/kg, and the gas has Cv = 0.7452 kJ/kgm-K, find the following: (5 pts each) a) Specific heat ratio (k) b) Specific heat for constant pressure (Cp) c) Gas constant (R)
- 1. Refrigerant R-22 with the mass of 2 kg is located inside the sealed container, initially saturated vapor at 6.8 bar. Heat was added to refrigerant and final pressure reached 20 bar according to pv=const. Neglecting the kinetic and potential energy changes determine: Internal energy change in [J] Heat added to the refrigerant in [J] and work done by fluid in [J]. 3.draw the Temperature-volume diagram showing all stages. 4.What do you think about the final stage condition? Is it gas, liquid-gas, or liquid stage? Use energy balance equation and find all unknowns using the NIST webbook.A fixed mass of an ideal gas is contained in a piston-cylinder assembly. The pressure and temperature at the initial stage are P1 = 350 kPa and T1 = 600 K. The gas has a molecular weight M = 28 kg / kmol and the constant volume specific heat is Cv = 750 J / kg-K. The initial volume is V1 = 0.50 m^3. The gas is cooled slowly to T2 = 300 K while the pressure remains constant. Find the following: The cylinder volume V2 after the gas has been cooled to 300 K. The mass of the gas in the cylinder, m. The change in the internal energy of the gas, ΔU. The heat transferred, Q. The work done, W Note: Universal gas constant: R prime = 8314.34 J/kmol-K and Specific gas constant: R = R prime / M3.00 molesof an ideal gas expands irreversibly from a pressure of 2.4 bars to a pressure of 0.15 bars, with its initial and final temperatures both at T= 300 K. No work is done in this process (you can imagine that it is a free expansion into an evacuated space, if you wish). Compute the following features of this process. (a) The initial and final volumes, and the change in volume for the gas, DV(in L). (b) DG(in kJ)(You should compute DSas part of this evaluation.) (c) DA(in kJ)
- While the piston is pinned, a cylinder with a volume of 0.05 m3 contains 200 kPa pressure and 300 K air temperature. Since the pressure is 0.4 MPa as a result of the heat transfer from the environment, the pin breaks and when the system becomes thermodynamically equilibrium, its volume becomes 0.1 m3. The area of the piston is 0.05 m2, the masses of the piston and above are 150 kg and the atmospheric pressure is 102 kPa. a) Find the temperature when the pin breaks.b) Calculate the pressure and temperature after the pin breaks and reaches the equilibrium position.Steam at 100°C is added to ice at 0°C. (a) Find the amount of ice melted and the final temperature when the mass of steam is 14 g and the mass of ice is 52 g. g °C (b) Repeat with steam of mass 2.1 g and ice of mass 52 g. g CSteam at 100°C is added to ice at 0°C. (a) Find the amount of ice melted and the final temperature when the mass of steam is 10.0 g and the mass of ice is 50.0 g. (b) What If? Repeat when the mass of steam is 1.00 g and the mass of ice is 50.0 g.