Merchant, F. W. (Francis Walter), 1855-1937 · Toronto : Copp, Clark · leaf 57
t, acting verticallydownward at its middle point C. (2) The reaction of the wall, Rx,acting at right angles to the ladder(the ladder resting on the top of thewall) at B. (3) The pressure at the peg, actingat A. The line of action of this forcewill be AD because the forces be*in^ in equilibrium… … ; R2 cos DAE - R: sin 30° = 0 (2) Equating to zero the algebraic sum of the moments of theforces about A, RJX40-160X AF = 0 (3) From (3) or 40 RjR, 160x20 cos 30°:40|/3. 0 Transposing, and dividing (1) by (2) MOMENTS. R2 sin DAE 160 - Rx cos 30° R2 cos DAE Rt sin 30° or * t^at7 160-60 5tan DAE _ ^…
Mechanics
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