In a thermodynamic point of view 4. You are told the initial and final states of a system and the associated change in internalenergy (AU). Can you determine whether the change in internal energy was due to heattransfer (Q) or to work (W)? Explain your answer.5. When you blow on the back of your hand with your mouth wide-open, your breath feelswarm. But, if you partially close your mouth (like during whistling) and then blow on theback of your hand, your breath feels cool. Why?

adiabatic process: delta U = W Isochoric process: delta U = Q

You are told the initial and final states of a system and the associated change in internal energy (AU). Can you determine whether the change in internal energy was due to heat transfer (Q) or to work (W)? Explain your answer.

You are told the initial and final states of a system and the associated change in internal energy (AU). Can you determine whether the change in internal energy was due to heat transfer (Q) or to work (W)? Explain your answer.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: Air is contained in a piston/cylinder device at an initial state where the volume is 1.7 m3,…

Q: Current Attempt in Progress Air within a piston-cylinder assembly, initially at 50 Ibf/ in.?, 510°R,…

Q: A divider separates 1 lb mass of carbon monoxide (CO) from a thermal reservoir at 150o F. the carbon…

A: Part(a).For CO:

Q: Refrigerant 134a at p1 = 30 lbf/in2, T1 = 40oF enters a compressor operating at steady state with a…

A: The Answer is below

Q: Refrigerant 134a at p1 = 30 lb/in², T1 = 40°F enters a compressor operating at steady state with a…

Q: Air within a piston-cylinder assembly, initially at 50 lbf/ in.2, 510°R, and a volume of 6 ft3, is…

A: Given data: P1=50 lbf/in2=7200 lb/ft2T1=510°RV1=6 ft3V2=3 ft3k=1.4 To fing: the mass, in lb, final…

Q: Apply the first law to a constant-volume process.

Q: 20-lb aluminum bar, initially at T₂ = 210°F, is placed in a tank together with 190 lb of liquid…

Q: Apply the second law to develop the absolute thermodynamic temperature scale.

A: Consider two reversible heat engines HE1 and HE2 are connected in series as shown in the figure.

Q: Refrigerant 134a at p1 = 30 lbf/in2, T1 = 40oF enters a compressor operating at steady state with a…

Q: Explain the calculation of entropy balance in a thermal system

A: Solution: The Entropy conservation pf a thermal system is shown below:

Q: Demonstrate the procedures for determining thermodynamic properties of pure substances from tables…

A: Property tables help us in finding out the thermodynamics properties of substances. The following…

Q: Third law of thermodynamics is concerned with: a. the value of absolute entropy b. energy transfer…

Q: Which of the following statements correctly completes the sentence: "The state postulate..." ...…

A: It is asked to find the correct option based on the term "The state postulate"

Q: An ideal gas described by T1 = 300 K, P1 = 1.20 bar, and V₁= 15.0 L at its intial state is heated at…

A: To find: The number of moles, the volume and temperature at 2 and 3 and work done at every process.…

Q: Air is contained in a piston/cylinder device at an initial state where the volume is 1.7 m3,…

A: Givenvolume of air V=1.7m3temperature T=250Kpressure P=454kPa

Q: Refrigerant 134a at p₁ = 30 lb/in², T₁ = 40°F enters a compressor operating at steady state with a…

Q: Describe an imaginary process that violates both the first and the second laws of thermodynamics.

A: First last of thermodynamics, just discusses the changes that a system is undergoing. The…

Concept explainers

Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

Question

In a thermodynamic point of view

4. You are told the initial and final states of a system and the associated change in internal
energy (AU). Can you determine whether the change in internal energy was due to heat
transfer (Q) or to work (W)? Explain your answer.
5. When you blow on the back of your hand with your mouth wide-open, your breath feels
warm. But, if you partially close your mouth (like during whistling) and then blow on the
back of your hand, your breath feels cool. Why?

Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Air within a piston-cylinder assembly, initially at 50 lbf/ in.?, 510°R, and a volume of 6 ft3, is compressed isentropically to a final volume of 1.75 ft³. Assuming the ideal gas model with k = 1.4 for the air, determine the: (a) mass, in Ib. (b) final pressure, in Ibf/in.2 (c) final temperature, in °R. (d) work, in Btu.
Identify the first law of thermodynamics as simply a statement of the conservation of energy principle for closed (fixed-mass) systems.
The entropy change of a system can be negative, but the entropy generation cannot.
The entropy change between two specified states is the same whether the process is reversible or irreversible.
What are the relative populations of the states of a two-level system as the temperature approaches zero?
Air within a piston–cylinder assembly, initially at 50 lbf/ in.2, 510°R, and a volume of 6 ft3, is compressed isentropically to a final volume of 0.5 ft3. Assuming the ideal gas model with k = 1.4 for the air, determine the: (a) mass, in lb. (b) final pressure, in lbf/in.2(c) final temperature, in °R.(d) work, in Btu.
A 30-lb iron casting, initially at 1500°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb. °R, and 0.45 Btu/lb. °R, respectively. (a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. T+= 257.4978 (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. 0 = °F i Btu/°R
A gas with specific volume v₁ = 1 m³/Kg and pressure p₁=1bar in a closed system undergoes a thermodynamic cycle which consists of the following three separate processes: 1->2: Isobaric compression to v₂-0.25 m³/Kg 2->3: Isometric heating. 3->1: Isothermal expansion (pV = constant) to the initial volume. Calculate the specific work produced by the gas per cycle. Present your answer in kJ/kg.
If you have a material that is initially hard and strong, would you expect it to cyclically harden or soften? What would be a way of characterizing how strong it must be initially to make your answer a bit more quantitative?
Refrigerant 134a at p1 = 30 lb/in?, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 400 lb/h and exits as saturated vapor at p2 = 160 lb;/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 4 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr-°R.
Refrigerant 134a at p1 = 30 lbş/in?, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 250 lb/h and exits as saturated vapor at p2 = 160 lbę/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 2.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr-°R.