A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 155
136 STATICS. [132, This result shows that, if two forces are equal and in-clined at an angle of 120°, their resultant is equal toeither of them. Also, if three equal forces acting on aparticle are inclined at angles of 120° to each other, theparticle will be in equilibrium. (d) y = 90° (Fig. 54).… … words, the two forces are at right angles to each other,the general yalue of R becomes R2 = P* + Q\ R = VP2 + Q? This result is derived immediately from the propertiesof a right-angled triangle, as are also the following rela-tions: cos a = R . \ P = R cos a; sin a = QR . \ Q = R sin a; tana = Q .…
Mechanics
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