ES 202 - Homework Assignments & Answers

Remarks:
1. Your instructors reserve the right to assign different homework problems for the lecture covered.
2. Answers to conceptual questions will not be given here.
Date Homework Assigned on Lecture # Homework Due on Lecture # Problems from Text Answers
Nov 28 1 - no homework -
Nov 30 2 4 5-64E  Add Part (c) Determine the entropy generation rate. (a) 47.4 oF, (b) 0.0479 ft2, (c) 0.187 Btu/s-oR
5-84  Add Part (b) Determine the entropy generation rate. (a) 267 oC, (b) 635 W/K
Dec 2 3 5 5-104 0.864 kg/s
5-122 103 kW, 133 oC
Dec 5 4 6 3-30 no answers given to table lookup problem
3-31 no answers given to table lookup problem
5-81 6.92 kg/s
Dec 7 5 7 3-57 (a) 49.9 kg, (b) 134 oC, (c) 131 MJ
3-63 1.33 MPa
5-105 0.107 kg/s
Dec 9 6 8 3-106 (a) 6304 kJ/kg, (b) 6288 kJ/kg, (c) 6110 kJ/kg
5-87 0.674 kg/s
7-67  (a) -0.428 kJ/kg-K, (b) 125 kJ/kg
Dec 12 7 9 7-68  Find the rate of entropy generation instead 0.820 W/K
7-69 28.81 kJ/K
Dec 14 8 - no homework -
Dec 16 9 12 7-98 89.8%
7-102 646 kPa, 703 kW
7-143 4.44 kW, 5.26 kW
Dec 19 10 - no homework (Merry Christmas!) -
Jan 4 11 13 8-105 0.793, 40.2%, 165 kg/s
8-106 0.873, 34.1%, 195 kg/s
Jan 6 12 14 8-135 0.322, 3.96, 1.26 kW
Repeat 8-135 with an isentropic compressor efficiency of 85% 0.322, 3.37, 1.49 kW
Jan 9 13 15 2-52E 64.3 psia
2-59 123 kPa
2-75  47.0 cm
Jan 11 14 16 11-16E 49,300 lbm
11-21 0.379 m, 0.524 m
11-59 522 kN
Jan 13 15 17 11-30 1053 kg/m3 (the 10-cm label on the figure should be "9.5 cm")
11-34 1050 N
Jan 16 16 18 HW 16 0.599 m
Jan 18 17 21 12-6 77.6%, 72.8%
12-46 33.8 m/sec
Jan 20 18 - no homework (study for Exam 2) -
Jan 23 19 - no homework (Exam 2 day) -
Jan 25 20 22 12-67 0.204 m, 40 W
Dimensional Analysis on Pipe Friction no answer provided
Jan 27 21 23 10-28 (b) 0.565 N
Drag Analysis over Entry Length (a) 2 U(b) 3 r Uo2 / 2  (c) 7 r Uo2 p R2 / 6
Jan 30 22 24 14-41 4.83 W
14-49 724 m, 4.73 MPa, 1.07 kW
Feb 1 23 25 14-43 (a) 16.2 cm3/sec  (b) 10.0 cm3/sec  (c) 22.4 cm3/sec (your solution should be based on first principles, not Equation 14-33)
14-80 2.97 kW
Feb 3 24 26 14-75 0.00597 m3/s (you may use EES or Excel to solve this iterative problem)
Feb 6 25 28 15-49 (a) 17.1 N  (b) 59.6 N
15-57 (a) 0.976 m  (b) 0.678 cm
Feb 8 26 29 15-33 38.0 m/s
15-66 13.7 m/s
Feb 10 27 - no homework (Exam 3 day) -
Feb 13 28 - 15-92 (a) 34.7 m/s  (b) 53.1 kN
Feb 15 29 - no homework -
Feb 17 30 - no homework (study for Finals) -