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Philadelphia University Mechanical Engineering Design 8th eng.ahmad jabali
Chapter 1
Problems 1-1 through 1-4 are for student research. 1-5 (a) Point vehicles
v x
Q¡ë Seek stationary point maximum
cars v 42.1v ? v 2 ¡ë ¡ë hour x 0.324
dQ 42.1 ? 2v ¡ë0¡ë ¡Å v* ¡ë 21.05 mph dv 0.324 Q* ¡ë (b) 42.1(21.05) ? 21.052 ¡ë 1368 cars/h Ans. 0.324
v l 2 x l 2
000001 v 0.324 l ¡ë Q¡ë + 2 x +l v(42.1) ? v v Maximize Q with l ¡ë 10/5280 mi v 22.18 22.19 22.20 22.21 22.22 Q 1221.431 1221.433 1221.435 ¡ç 1221.435 1221.434
?1
% loss of throughput ¡ë (c) % increase in speed
1368 ? 1221 ¡ë 12% 1221
Ans.
22.2 ? 21.05 ¡ë 5.5% 21.05 Modest change in optimal speed Ans.
Philadelphia University Mechanical Engineering Design 8th eng.ahmad jabali
2
Solutions Manual ? Instructor¡¯s Solution Manual to Accompany Mechanical Engineering Design
1-6 This and the following problem may be the student¡¯s ?rst experience with a ?gure of merit. ? Formulate fom to re?ect larger ?gure ¡¦(»ý·«)