Equilibrium

A system of forces is said to be in equilibrium when the forces acting upon a body simultaneously produce no acceleration, either of translation or rotation. The resultant of such a system of forces is evidently zero. When applied to bodies supported and acted upon by gravity we may have three conditions of equilibrium, stable, unstable, and neutral. A body is stable if the point of support be above the center of gravity, unstable if it be below, and neutral if these two points be coincident. There are thus various degrees of stability and instability. A brick resting on its broad face is far le unstable than when resting on its end. h In general the instability of a body is proportional to where A' A is the area of the base upon which it rests and h the height of the center of gravity above the base. It may be said in general that a body is in stable, unstable, or neutral equilibrium according as the work nece ary to expend in displacing its center of gravity is positive, negative, or zero. Equilibrium of Demand and Supply. Condition of industrial organization in which the volume of production adjusts itself to normal demand, or to the general condition of the market. IMG:content-1352.jpg:[blocks in formation] to the sub-genus Asinus . This group has warts only on the fore legs, the tail has long hairs only at the end, the hoof is narrow, and one or more stripes appear upon the hind legs, shoulder, and back. Reciprocal cro ing between the A and Horse give us the Mule and Hinney, the former more a -like, the father having impre ed his characters more strongly.