The 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 < 1 of 1 Part E What is the engine's thermal efficiency? Express your answer using two significant figures. 15. ΑΣΦ n = 20 Submit Previous Answers Request Answer ? %
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- 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 figure (Figure 1)shows the cycle for a heat engine that uses a gas having γ=1.25. The initial temperature is T1=300K, and this engine operates at 30 cycles per second. What is the power output of the engine? Pout = 1.6 kW What is the engine's thermal efficiency?The given P-V diagram relates to a fixed quantity of CO2, assumed to be an ideal gas. The temperature at point A is 35 degrees celsius. 1. What is the total mass of CO2? 2. What is the temperature at point C in degrees celsius 3. What ist he heat added to the gas over the ABCA cycle 4. 3200 J of heat flows out of the system when the system is taken ont he straight path from C and A. What is the change in internal energy along that path?
- Can you help 2a and subpart 2b 1. A certain power plant produces useful work (i.e. electricity) at a rate of 900 MW (remember, that's 900 x 106 joules/sec). How many joules of electricity does this power plant produce in 24 hours? 2a. To generate this amount of electricity, the power plant uses 2.22 x 1014 J of heat drawn from burning coal. What is the efficiency of this power plant? 2b. How much waste heat, Qc, does this power plant eject into its cold reservoir in 24 hoursA mass of steam at 120°C is added to 2kg of ice at 0°C to yield water at 20°C. What is the total amount of energy in Joules is lost by the steam? ROUND OFF YOUR ANSWER IN WHOLE NUMBER. DO NOT WRITE THE UNIT IN YOUR FINAL ANSWER. L = 3.34x10²; Lv 2.26x106 Cwater = : 4186 kg.C; Csteam = 2010- kg.C =The 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 B
- QUESTION 25 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 4 3 2 1 O A D 1 1 2 3 4 B I 5 → V (m³)Answer the problem. For helium, R=2.0769 and Cp=5.1926 KJ/kg-K. Three kg of helium operates cycle where the processes are constant volume (1-2): constant pressure (2-3): and constant temperature (3-1). Given that P1=100 kPa T1=300 degree Kelvin, and v1/v3=5, determine the heat added in the cycle. a. 22.316kJ b. 14.225kJ c. 8.405kJ d. 36.708kJHeating The amount of chemical potential energy stored in one gallon of heating oil is approximately 130 MJ. This is the amount of energy released as heat during combustion. (Note: 1.0 kWh = 3600 kW-sec = 3600 kJ = 3.6 MJ. Verify this equivalency and use it to answer the following question.) a. Suppose that during the winter, heating your home with oil may require an average of 6 gallons of oil per day. Assuming that to be the case, what is the average daily energy consumption? (Express your answer in kWh.) b. If the cost of heating oil is $3.00/gallon, what is the daily cost to heat your home? Use this information to find the cost of heating with oil in units of cents/kWh.
- Solve problems involving temperature, thermal expansion, heat capacity, heattransfer. 1. Consider a house that has a volume of 500 m3 and at room temperature at 25◦C. Determine the air that enters or leaves the house if the temperature falls to0◦C in the direction of airflow. 2. How much heat is absorbed by 2.50 x 102 g of water when it is heated from 10◦C to 85 ◦C?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 5Please 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.