Sol Cap 02 - Edicion 8

COSMOS: Complete Online Solutions Manual Organization System
Chapter 2, Solution 129.
Using the triangle rule and the Law of Sines
(a)
Have:
20 lb 14 lb
sinα = sin 30°
sinα = 0.71428
(b) β = 180° − ( 30° + 45.6°
)
α = 45.6°⊳
= 104.4°
Then:
R 14 lb
=
sin104.4° sin 30°
R =
27.1 lb ⊳
Vector Mechanics for Engineers: Statics and Dynamics, 8/e, Ferdinand P. Beer, E. Russell Johnston, Jr.,
Elliot R. Eisenberg, William E. Clausen, David Mazurek, Phillip J. Cornwell
© 2007 The McGraw-Hill Companies.