The heat engine shown in the figure uses 2.0 mol of a monatomic gas as the working substance. (Figure 1) igure p (kPa) 600 400 200 0 0 0.025 0.050 -V (m³) 1 of 1 Part E part. What is the engine's thermal efficiency? Express your answer using two significant figures. 15. ΑΣΦ n = Submit Request Answer ? %
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- 1st Law of Thermodynamics - Cyclic Process 1 In the figure, pressure PA=PB = 4.80 X 105 Pa. pressure P= P =1.6X 10° Pa. Volume VA = VD= 0.0016 m², V = 0.0064 m³ Don't use scientific notations in your answers. Calculate the work done from A to B. Include a proper sign. Keep 2 decimal places. Enter a number J Submit Calculate the heat from A to B. Include a proper sign. Keep 2 decimal places. Enter a number J Submit Pressure Calculate the change in internal energy from A to B. Include a proper sign. Keep 2 decimal places. Enter a number J Submit D m³ 3 B isotherm From B to C is an isothermal (constant temperature) process. Caculate the volume at point C. Keep 5 decimal places. Enter a number Submit C VolumePlease answer the following question(s): 1. (a) What is the best coefficient of performance for a refrigerator that cools an environment at -28° C and has heat transfer to another environment at 47 ° C? COP ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = kj (c) What is the cost of doing this if the work costs 10.0 cents per 3.6 × 106 J (a kilowatt-hour)? Cost in cents = ✓ (d) How many kJ of heat transfer, Qh occurs into the warm environment? Qh= kj Think about what type of refrigerator might operate between these temperatures. Hint: Use the appropriate formula for a refrigerator which is different from a heat pump.The temperature at state A is 20°C, that is 293 K. What is the heat (Q) for process A to D, in MJ (MegaJoules)? (Hint: What is the change in thermal energy and work done by the gas for this process?) Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. p (atm) 5 A D + V (m³) 1 2 3 4 5
- The temperature at state A is 20°C, that is 293 K. What is the heat (Q) for process D to B, in MJ (MegaJoules)? (Hint: What is the change in thermal energy and work done by the gas for this process?) Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. p (atm) 4 3 2 -> +V (m) 5An engine does 25 J of work and exhausts 10 J of waste heat during each cycle. TH= What is the engine's thermal efficiency? Express your answer as a percentage. 17 ΑΣΦ e= If the cold-reservoir temperature is 30 °C, what is the minimum possible temperature in °C of the hot reservoir? Express your answer in degrees Celsius. ? ΑΣΦ °C ?Ue A:0r * Il. pluls ► exam 1.pdf Q1// Define the following First law of thermodynamics, adiabatic process, Boyle's law, Reversibility, and Pressure. Q2// Ten kg of oxygen are heated from 350 to 500 K at constant pressure. Calculate the change of enthalpy, change internal energy, heat transfer and work done. Take Cp-0.909, Cv=0.649 Q3// In a nozzle air at 700°C and twice atmospheric pressure enters with 50 m/s velocity, and leaves at a temperature of 40°C. Determine velocity of air at exit. Take Cp = 1.005 kJ/kg.K for air.
- The temperature of an ideal gas is raised from 298 K to 402 K in a process that increases the heat content of the gas by 1000 J. What is the = -R for the gas, and these are constant. Hint: It will be 2 work performed on the system by this process? Assume that c 'y helpful to evaluate AU for this process. 3 =-R and C RThe heat engine shown in the figure uses 2.0 mol of a monatomic gas as the working substance. (Figure 1) Figure p (kPa) 600 400 200 0 0 0.025 0.050 V (m³) 1 of 1 Part A Determine T₁, T2, and T3. Enter your answers numerically separated by commas. Express your answer using two significant figures. T₁, T2, T3 = 600,1800,1200 K Submit Previous Answers Correct Part BAn engine has a hot reservoir of 520K and a low-temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %
- An electrical coil is used to heat 20.0 kg of water in a closed well-insulated vessel. The water is initially at 25°C and 1 atm. The coil delivers a steady 3.25 kW of power to the vessel and its contents, 97% of which goes into heating the water. Determine how long it will take to heat the water to its normal boiling point. Answer in minutes with 3 sig. fig's in decimal format. Show all work starting from the full form of the appropriate balance and justifying any terms being zero or negligible. Cite any data sources used.A 361-W heat pump operates between the ground, whose temperature is 6.2, and the interior of a house at 20.1. What is the theoretical maximum amount of heat per hour that the heat pump can supply to the house? Express your answer in MJ, to at least one digit after the decimal point.A gas is compressed inside a cylinder. An average force of 12 N acts to move the piston 3 m. During the compression, 12 J of heat are conducted away from the gas. What is the change in internal energy of the gas? Calculate answer to one decimal.