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COSMOS: Complete Online <strong>Sol</strong>utions Manual Organization System<br />
Chapter 2, <strong>Sol</strong>ution 78.<br />
(a) ( )<br />
F x = 180 lb cos30° cos 25°<br />
= 141.279 lb<br />
(b)<br />
( )<br />
F =− 180 lb sin 30°<br />
y<br />
=− 90.000 lb<br />
( )<br />
F z = 180 lb cos30° sin 25°<br />
= 65.880 lb<br />
141.279 lb<br />
cosθ x =<br />
180 lb<br />
cos<br />
θ y<br />
−90.000 lb<br />
=<br />
180 lb<br />
F = 141.3 lb !<br />
x<br />
F =− 90.0 lb !<br />
y<br />
F = 65.9 lb !<br />
z<br />
or θ x = 38.3°!<br />
or θ y = 120.0°!<br />
cosθ =<br />
z<br />
65.880 lb<br />
180 lb<br />
or θ z = 68.5°!<br />
Vector Mechanics for Engineers: Statics and Dynamics, 8/e, Ferdinand P. Beer, E. Russell Johnston, Jr.,<br />
Elliot R. Eisenberg, William E. Clausen, David Mazurek, Phillip J. Cornwell<br />
© 2007 The McGraw-Hill Companies.
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