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ighth<br />
dition<br />
Vector Mechanics for Engineers: Statics<br />
Sample Problem 2.1<br />
• Trigonometric solution - Apply the triangle rule.<br />
From the Law of Cosines,<br />
R<br />
2<br />
P<br />
<br />
sin A<br />
<br />
Q<br />
sin A <br />
2<br />
Q<br />
2<br />
2PQ<br />
cos B<br />
2 2<br />
40N 60N 240N60Ncos155<br />
R 97.73N<br />
From the Law of Sines,<br />
sin B<br />
R<br />
Q<br />
sin B<br />
R<br />
sin155<br />
A 15.04<br />
20 A<br />
35. 04<br />
60N<br />
97.73N<br />
© 2007 The McGraw-Hill Companies, Inc. All rights reserved.<br />
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