ME 235 EXAM 2, NOVEMBER 22, 2005 C. BORGNAKKE, ME Problem 1 (50 Points) Air at 300 K, 100 kPa in a rigid box is heated to 1000 K by a 1500 K source. a) Find the final pressure. b) Find the specific heat transfer. c) Find the total entropy generation
Borgnakke Sonntag
Fundamentals of
Thermodynamics
STUDY
PROBLEMS
CHAPTER 2
8e
CHAPTER 2
STUDY PROBLEMS
PROPERTIES OF A PURE SUBSTANCE
The vapor-liquid-solid phase equilibrium in a pure substance
Tables of thermodynamic properties
The ideal gas law
Compress
QUESTION 1: Multiple choice. Circle the most appropriate answer. [8 points]
(a)
For the flow of an ideal gas through an adiabatic throttle, the temperature at the exit of the throttle
is _ the inlet temperature (neglecting kinetic and potential energy eff
Thermodynamics
Lecture 4: Work and Heat
(Chapters 4 & 5)
Today's objective:
1. Continue our discussion of:
Heat – different modes of heat
transfer.
2. Introduce:
First Law of Thermodynamics
+
+
Thus, total energy increase or
decrease inside the system is:
FIRST LAW for a CONTROL VOLUME
Both Mass & Energy can cross the boundaries of a
control volume the mass carries with it energy.
38
F
Conservation of Mass:
dmC .V .
m
i
dt
Total mass flow rate
into the C.V. from
all inlets
Rate of increase
of mass in the
Thermodynamics
ME 235
Prof. Angela Violi
Fall 2013
Homework #5 Solution
Due *Friday,
10/25 at 4:30 pm* box outside 3005 EECS
[Grade for the problem stated in brackets and italics]
1.
Work is entropy free, and sometimes the claim is made that work will not
Problem 1 Steam expands in a turbine steadily at a rate of 25, 000kg/h, entering at 6MP a and 450C and leaving at 20kP a as saturated vapor. If the power generated by the turbine is 4MW , determine the rate of entropy generation for this process. Ass
Squad Strategy Notes
All positions are referenced with Zones 1 and 2 at the top of the playing field
Cubes from preceding zones can be mixed when picking up and transporting to the next zone because all
moves after the first move are worth two points
1. Z
Zonta Owens
ME 250 MS1
9/10/2016
MS1: Individual Strategy Proposal
Overall Strategy: Patience is bitter, but its fruit is sweet. Aristotle.
Due to lack of time and danger of possibly falling of the course and being
disqualified, I believe it is best that
ME235: Thermodynamics I
Exam #2
SECTIONS 001 AND 002 (Profs. Atreya and Siegel)
April 1, 2015
7:00pm 8:30pm
Exam Rules:
Open Textbook
One Page of Notes and Calculator Allowed
Printouts of Appendices A and B Allowed
No Laptops or Cell Phones
When you are d
ME235: Thermodynamics I
Exam #1
February 20, 2013
7:00pm 8:30pm
SECTIONS 001 AND 002
Exam Rules
Open Textbook
One Page of Handwritten Notes and Calculator Allowed
Printouts of Appendices A and B Allowed
No Laptops or Cell Phones
When you are done, staple
ME 235
Spring 2015
Exam 1
May 27, 2015 (6:00 PM - 7:00 PM)
Open textbook
1-8.5 x 11 sheet (double sided) formula sheet
Calculator
Closed notes
No computers
Honor code will be enforced. Your exam will NOT be graded if you fail to sign the honor code.
A sta
ME235
Exam 1 Winter 2017
ME235 Thermodynamics I
Winter 2017 Exam 1
Name
SOLUTIONS
Section
Score
Short answer questions:
27 points
Problem 7:
8 points
Problem 8:
25 points
Problem 9:
40 points
Total =
100 points
Leave the solution in terms of the given var
ME235: Thermodynamics I
Exam #2
November 20, 2014
7:00pm 8:30pm
SECTIONS 001 AND 002
Exam Rules
Open Textbook
One Page of Handwritten Notes and Calculator Allowed
Printouts of Appendices A and B Allowed
Printouts of Key Concepts and Formulas Allowed
No La
ME235: Thermodynamics I
Exam #2
November 21, 2016
7:00pm 8:30pm
SECTIONS 001, 002, and 003
Exam Rules
Open Textbook
One Page of Handwritten Notes and Calculator Allowed
Printouts of Appendices A and B Allowed
No Electronic Devices (Including E-Readers) Al
THE UNIVERSITY OF MICHIGAN
Department of Mechanical Engineering
ME 235 Thermodynamics I / Fall 2016
HW #9 Due Thursday November 17
1
A piston/cylinder receives R-134a at 300 kPa and compresses it in a reversible
adiabatic process to 1000 kPa, 60oC. Find t
THE UNIVERSITY OF MICHIGAN
Department of Mechanical Engineering
ME 235 Thermodynamics I / Fall 2016
HW #10 Due Thursday December 1
1
A heat upgrade system uses a compressor receiving R-134a as saturated vapor 150
kPa and compresses it in a reversible adia
THE UNIVERSITY OF MICHIGAN
Department of Mechanical Engineering
ME 235 Thermodynamics I / Fall 2016
HW #6 Due Thursday October 27
1
An infinity pool is to be filled with 60 m3 water from a garden hose of 2 cm
diameter flowing water at 3 m/s. Find the mass
HOMEWORK SET 1
1.31
A 1500-kg car moving at 20 km/h is accelerated at a constant rate of 4 m/s2 up to
a speed of 75 km/h. What are the force and total time required?
Solution:
dV V
a = dt =
=>
t
(75 20) km/h 1000 m/km
V
t = a =
= 3.82 sec
3600 s/h 4 m/s2
ME 235 HW set 3
2.69
Is it reasonable to assume that at the given states the substance behaves as an ideal
gas?
Solution:
a) Oxygen, O2
at
30C, 3 MPa
Ideal Gas ( T Tc = 155 K from A.2)
b) Methane, CH4 at
30C, 3 MPa
Ideal Gas ( T Tc = 190 K from A.2)
c) Wa
ME 235 HW set 2
2.5
Water at room temperature and room pressure has v 1 10n m3/kg what is n?
See Table B.1.1 or B.1.2 to determine it is in the liquid phase
(you should know this already).
Table A.4 or from B1.1 at 20oC:
n = 3 (v = 0.00100 m3/kg)
2.21
Dry
Exam #2 Information
Monday November 21, 7-8:30 PM in GGB 1571*
*Students entitled to extra time: 6-8:15 PM in GG Brown 2540
Covers chapters 1-6 and HW material inclusive of HW 9
Open book
Any version OK
If you do not have the 8th Edition, can bring p
Problem 1 (35 pts). A piston/cylinder system contains 0.5 kg of water at 30oC.
The cylinder diameter is 10 cm, and the atmospheric pressure (P0) is 100 kPa.
Two sets of stops in the cylinder constrain the volume to have a minimum value
of 0.2 m3 and a max
TOO EASY
ME 235 EXAM I , May 28, 2009
C. BORGNAKKE ME Dept.
1. [25%] Determine the phase and the missing properties
a. H2O 20C, v = 0.001000 m3/kg
P=? u=?
3
b. R-410A 400 kPa, v = 0.075 m /kg T = ?, u = ?
c. NH3 10C, v = 0.1 m3/kg
P=? u=?
d. N2
101.3 kPa,
ME235: Thermodynamics I
Exam #1
October 16, 2014
7:00pm 8:30pm
SECTIONS 001 AND 002
Exam Rules
Open Textbook
One Page of Handwritten Notes and Calculator Allowed
Printouts of Appendices A and B Allowed
Printouts of Key Concepts and Formulas Allowed
No Lap
Problem 1 (30 pts). Air in a piston/cylinder is at 90 kPa, 17C with a volume of 0.001 m3. It is
now compressed to a volume 10 times smaller via a process for which the quantity Pv1.4 =
constant, with no heat transfer.
(a) Find the mass of air.
(b) Find th
Problem 1 (35 pts). A piston/cylinder contains 0.5 kg of air at
300K. When the air volume is less than or equal to 0.3 m3, the
piston floats at a pressure of 200 kPa. When the air volume is
greater than or equal to 0.3 m3, a force feedback device in the
c
ME235: Thermodynamics I
Exam #2
November 20, 2014
7:00pm 8:30pm
SECTIONS 001 AND 002
Exam Rules
Open Textbook
One Page of Handwritten Notes and Calculator Allowed
Printouts of Appendices A and B Allowed
Printouts of Key Concepts and Formulas Allowed
No La