tailieunhanh - Engineering Mechanics Statics - Examples Part 2

Tham khảo tài liệu 'engineering mechanics statics - examples part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Engineering Mechanics - Statics Chapter 2 forces acts along the positive y axis and has magnitude F. Given F 600 lb F 180 lb F2 300 lb a 30 deg a2 40 deg Solution Initial guesses a 40 deg Y 50 deg p 50 deg F3 45 lb Given FRx Fx 0 -F F2 cos a sin a2 F3 cos a FRy SFP F F2 cos a cos a 2 F3 cos p FRz SFZ 0 -F2 sin a F3 cos Y cos a 2 cos p 2 cos y 2 1 a A a p p Find F3 a p y F3 428 lb deg J Y J Y y Problem 2-70 Determine the magnitude and coordinate direction angles of F3 so that the resultant of the three forces is zero. 72 2007 R. C. Hibbeler. Published by Pearson Education Inc. Upper Saddle River NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced in any form or by any means without permission in writing from the publisher. Engineering Mechanics - Statics Chapter 2 Given F1 180 lb F2 300 lb Solution Initial guesses Given FRx ZFv FRy y aj 30 deg a2 40 deg a p 40 deg Y 50 deg 50 deg F3 45 lb 0 -F1 F2 cos aj sin a2 F3 cos a 0 F2 cos aj cos a 2 F3 cos p Frz 2Fp 0 -F2 sin aj F3 cos y cos a 2 cos p 2 cos Y 2 1 Find F3 a p Y F3 250 lb a p Y 7 Problem 2-71 Specify the magnitude F3 and directions a3 p3 and Y3 of F3 so that the resultant force of the three forces is fr. Units Used kN 103 N Given F1 12 kN c 5 V F2 10 kN d 12 0 30 deg 73 2007 R. C. Hibbeler. Published by Pearson Education Inc. Upper Saddle River NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced in any form or by any means without permission in writing from the .