69. A 100-kgf uniform rod AB rests with one of its ends on a smooth horizontal floor and the other end on a smooth sur-
face inclined at an angle of 30° to the horizontal as shown in
Fig. 55. The rod is held at the end B by a cord running over a
pulley C and carrying a weight P Part of the cord BC is parallel
to the inclined surface. Neglecting friction, calculate the weight P
and the pressures Na and NB, acting on the floor and on the
inclined surface.
Ans. P=25 kgf; NA=50 kgf; Ng=43.3 kgf.
C
B
301
A
P
Cir 55