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COSMOS: Complete Online <strong>Sol</strong>utions Manual Organization System<br />
Chapter 2, <strong>Sol</strong>ution 77.<br />
(a) ( )<br />
F = 180 lb cos35° sin 20°<br />
x<br />
= 50.430 lb<br />
( )<br />
F =− 180 lb sin 35°<br />
y<br />
F = 50.4 lb !<br />
x<br />
=− 103.244 lb<br />
F =− 103.2 lb !<br />
y<br />
( )<br />
F = 180 lb cos35° cos 20°<br />
z<br />
= 138.555 lb<br />
F = 138.6 lb !<br />
z<br />
(b)<br />
50.430 lb<br />
cosθ x =<br />
180 lb<br />
or θ x = 73.7°!<br />
cos<br />
θ y<br />
=<br />
−103.244 lb<br />
180 lb<br />
or θ y = 125.0°!<br />
138.555 lb<br />
cosθ z =<br />
180 lb<br />
or θ z = 39.7°!<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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