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 259
pectively parallel to thethree forces P, P, W, and therefore (132, Cor.) are pro- 240 STATICS. [231. portional to them; moreover, ABC and HKL are similar.Hence P : W : R = AB : BC : AC = HE : KL : HL,P HK or W B_W KL HLKL = tan a, = sec a. (3) (4) The result in (3) may be stated as follows: When… … Fig. 180. plane, raise the weight (W) from L to H. The effectivecomponent of the force, parallel to the plane, is P cos ft,and the distance through which it acts is the length ofthe plane (I); therefore the work done by the power isP cos /?./, that done upon the weight is Wh. Hence P cos /?. I =…
Mechanics
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