Problem 4 During a constant volume process, measurements indicate that 28 J of heat entered the system. What is the change in internal energy for the process?
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- One of the consequences of the 2nd Law of Thermodynamics is: A. You can get the same amount of energy out of a process as you put in B. Two bodies are in thermal equilibrium when they have the same temperature C. You can get more energy out of a process than you put in D. The starting and finishing temperature of a cycle must be the same E. You can not get as much energy out of a process as you put inProblem 8 In a non-flow process carried out on 5.4 kg of a substance, there was a specific internal energy decrease of 50 kJ/kg and a work transfer from the substance of 85 kJ/kg. Determine the heat transfer and state whether it is gain or loss.Q2/ Solve the following: 1. Prove that the thermal efficiency of a heat engine is QL = 1- Nen QH 2. Prove that V avg Vf9 x = Q3/ Define the following: Adiabatic Process Нeat Thermal Efficiency Heat Engine Q4/ Write the mathematical equation for the following Enthalpy Ideal-gas equation of state Entropy Specific gravity COPR Pascal's law СОРНР Vacuum pressure
- A gas undergoes the process shown in the diagram below. During the process AB, the internal energy of the gas decreases and a certain amount of heat Q goes out of the system for the process CA. Use this information to answer the questions below. Select from either positve, negative or zero for each W, Q and ΔU.The thermodynamic cycle of a heat engine using ideal helium gas is shown in the P-V diagram. The ratio of heat capacities y (also called ratio of specific heats) is the ratio of the heat capacity at constant pressure Cp to the heat capacity at constant volume Cy. For ideal helium gas, y = 1.67. Select the stage that is paired correctly with the process it represents in the P-V diagram. 1-2: adiabatic process O2-3: isochoric process 3-4: isothermal process 4-1: isobaric process p (kPa) 0.8 0.6- 0.4- 0.2 0.0 2 0.2 0.4 0.6 1 0.8 V(m³) 1.0A heat engine does 30.0 J of work and exhausts 35.0 J of waste heat during each cycle. Part A What is the engine's thermal efficiency? Express your answer as a percentage. 46.2 % Submit Correct Part B Previous Answers If the cold-reservoir temperature is 30.0 °C, what is the minimum possible temperature in °C of the hot reservoir? Express your answer in degrees Celsius. —| ΑΣΦ 383.35 ? °C
- In an engine, an almost ideal gas is compressed adiabatically to half its volume. In doing so, 2710 J of work is done on the gas. Part A ▼ How much heat flows into or out of the gas? Express your answer with the appropriate units. ? Q = Value Units Submit Request Answer Part B What is the change in internal energy of the gas? Express your answer with the appropriate units. HẢ ? AU = Value Units Submit Request AnswerPart A Ideal-gas processes are often shown on a pV diagram that graphs pressure versus volume. (Figure 1) is the pV diagram for 2.0 mol of a monatomic gas that undergo a process taking them from initial state i to final state f What is the change in temperature? Express your answer in kelvins. Figure 1 of 1 p (kPa) AT = K 200 f Submit Request Answer 100 Part B 0- 0. V (L) 150 What is the change in entropy? 50 100 Express your answer in joules per kelvin.1st and 2nd Law of thermodynamics Worksheet 1. A car engine deliver 8.2 kJ of work per cycle. Its efficiency is 25%. A) How much heat is absorbed and how much heat is exhausted from its fuel combustion? B) The car is now tuned and its efficiency goes to 31%. What are the new values of heat absorbed and heat exhausted? 1 of 3
- 2 What is the thermal efficiency for the heat engine illustrated on the pV diagram below? The gas is monatomic p(Pa) 10 V(m³) 7 3A gas, initially at 22 degrees Celsius expands from 2.5 m^3 to 5 m^3 while keeping constant pressure of 10^5 Pa. A) Sketch the PV diagram for this process B) Find the work done by the gas during this process C) What is the final temperature of the gas?