Elements of mechanics: treated by means of the differential and integral calculus (1887)
Peck, William G[uy], 1820-1892. [from old catalog] · New York, Chicago, A. S. Barnes & company · leaf 116
Fig. 73. (39.] That is, when the power is parallel to the plane, the poweris to the resistance, as the height of the plane is to its length. If the power is parallel to the base of the plane, we shallhave, <p — a = 90° — a; whence, sin((p — a) z= cos a = AC,AB also, sin a BCAB … Substituting in Proportion (38),and reducing, we have, P : R :: BC : AG Fig. 74. (40. That is, the power is to the resistance as the height of theplane is to its base. From the last proportion we have, P = B^ = iftana.AC If we suppose a to increase, the value of P will increase,and when a becomes…
Mechanics
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