Agate is good protective energy stone, especially for children, and is very calming and soothing. It also can help strengthen the body's connection to the earth.
The friction factor, f, is a dimensionless factor that depends primarily on the velocity u, diameter D, density Ï, and viscosity Î·. It is also a function of wall roughness which depends on the size Îµ, spacing Îµ' and shape of the roughness elements characterized by Îµ''.
Thus for any factor the MFC is the change in total amount paid for all units of that factor divided by the change in the quantity of that factor employed. A firm that wants to optimize its profits hires each factor up to the point at which its marginal factor cost equals its marginal revenue product (MFC=MRP). This article related to microeconomics is a stub.