Current chemical engineering textbooks teach that the driving force for diffusive mass transport in ideal solutions is the gradient in mole fraction. This is only true for ideal solution liquids. Therefore, it is shown that the appropriate driving force for use with ideal gases is the gradient in partial pressure. (JN)

A simplified discussion of how a whip cracks and what happens when an ideal chain runs over an ideal pulley or off the edge of an ideal table. (MM)

Discusses the various views on Galileo's demonstration of free fall. Cites several historians' accounts of early free fall experiments and Galileo's contributions to knowledge in this area. (TS)

Describes an action program of power instruction designed for student understanding and application of power related phenomena. (GR)

Subjects improved significantly in vertical jump capacity under both training regimes; however, no significant difference was found between the two training methods. (MJB)

Studies the optimum launch angle for maximizing the long jump from a kinematical point of view. (CCM)

Tyrosinase (EC 1.14.18.1) catalyzes the oxidation of L-3,4-dihydroxyphenylalanine (L-DOPA) to 2,3,5,6-tetrahydro-5,6-dioxo-1H-indole-2-carboxylate (dopachrome), according to the classical Michaelis-Menten kinetic mechanism. The enzyme is strongly but slowly inhibited by alpha-amino-beta-[N-(3-hydroxy-4-pyridone)] propionic acid (L-mimosine), a…