DATA In your summer job with a venture capital firm, you are given funding requests from four inventors of
Prototype | ||||
A | B | C | D | |
TC (°C), low-temperatu re reservoir | 47 | 17 | –33 | 37 |
TH (°C). high-t emperatu re reservoir | 177 | 197 | 247 | 137 |
Claimed efficiency e (% ) | 21 | 35 | 56 | 20 |
(a) Based on the TC and TH values for each prototype, find the maximum possible efficiency for each. (b) Are any of the claimed efficiencies impossible? Explain. (c) For all prototypes with an efficiency that is possible, rank the prototypes in decreasing order of the ratio of claimed efficiency to maximum possible efficiency.
Want to see the full answer?
Check out a sample textbook solutionChapter 20 Solutions
University Physics with Modern Physics (14th Edition)
Additional Science Textbook Solutions
College Physics
Physics for Scientists and Engineers with Modern Physics
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
College Physics: A Strategic Approach (3rd Edition)
Applied Physics (11th Edition)
Sears And Zemansky's University Physics With Modern Physics
- You have a spherical heater, outside diameter = 3.40 cm, immersed in a container of water. In order to keep the water in the container heated to a constant temperature of 35.0°C you adjust the temperature of the spherical heater. You reach a steady-state condition when the surface temperature of the spherical heater is at 79.0°C. Assuming the electrical efficiency of the heater is 100.0%, calculate the power required by the heater (i.e., calculate q). Ignore radiation.arrow_forwardThe 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. η = Submit VE ΑΣΦ Request Answer ? %arrow_forwardThe 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 E What is the engine's thermal efficiency? Express your answer using two significant figures. VE ΑΣΦ n = 5.0 Submit Previous Answers Request Answer ? X Incorrect; Try Again; 5 attempts remaining %arrow_forward
- With the following experimental data, calculate the average ignition temperature and the theoretical minimum ignition heat flux for the following thermally thick material.arrow_forwardP₁ P3 Р V. T₁ 2 T₂ 3 T₁ V V. A heat engine consists of a heat source that causes a monatomic gas to expand, pushing against a piston, there by doing work. The gas begins at a pressure of p₁-300 kPa, a volume of V₁=150 cm³, and room temperature, T₁= 20 °C. On reaching a volume of V₂=450 cm³, the piston is locked in place, and the heat source is removed. At this point the gas cools back to room temperature. Finally, the piston is unlocked and used to isothermally compress the gas back to its initial state. The cycle is shown on the pV-diagram in the figure. Molar heat capacity at constant pressure for monatomic ideal gas is Cp = Cv+ R = 5R/2 where the universal gas constant is R = 8.314 J/mol K) Determine the work done on the gas in the process 2-3. Express your answer in J.arrow_forwardThree moles of an ideal gas at latm pressure and 20°C are heated at constant pressure until the final temperature is 80°C. For the gas C, = 7.50+3.2x 103 T cal mole K-. Calculate AU, AE and q for the processarrow_forward
- Consider the operation of an actual turbine in a gas turbine engine. The mass flow rate is 50 lbm/s. The turbine inlet temperature is 2040 deg F. The pressure ratio in the compressor is 18.15. The turbine efficiency is 0.91. Assume variable specific heats. The turbine work output is nearly Group of answer choices 310 B/lbm 340 B/lbm 355 B/lbm 325 B/lbmarrow_forwardIn many ideal gas problems, room temperature is considered to be at 300 K to make calculations ?easier. What is this temperature in Celsius C = 60° a O C = 66°.bO C = 63°.cCarrow_forwardAir enters an adiabatic nozzle at 60 psia, 5408F, and 200 ft/s and exits at 12 psia. Assuming air to be an ideal gas with variable specific heats and disregarding any irreversibilities, determine the exit velocity of the air.arrow_forward
- Problem 18. Six moles of monatomic ideal gas ( C, = 3R/2, Cp=5R/2) at initial temperature 250 K expands at constant pressure. In this process 800 J of heat entering the gas. How much work done by the gas during this process?arrow_forwardProblem 8: In an adiabatic process oxygen gas in a container is compressed along a path that can be described by the following pressure p, in atm, as a function of volume V, in liters:p = p0 V-6/5.Here p0 is a constant of units atm⋅L6/5. The initial and final volumes during the process were Vi = 3 L and Vf = (Vi/2) L, respectively. If p0 = 2.9 atm⋅L6/5, find the amount of work done on the gas, in joules.arrow_forwardI need help solving number 11. In question 1, they say U=(3/2)PV I found work on the gas as -3/2PV, so therefore Q should be 6/2PV but the answer key says 6PV.arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning