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…

An experiment on kinetics of deactivation of carbonic anhydrase by removal of zinc is demonstrated. Carbonic anhydrase, the enzyme that catalyzes the interconversion of carbon dioxide and bicarbonate, requires on Zn(II) ion in its active site, and removal of the zinc cofactor by complexion to another ligand leaves the apoenzyme, which is totally…

The technique for producing quantum-sized zinc oxide (ZnO) particles is much safer than a technique that used hydrogen sulfide gas to produce cadmium sulfide and zinc sulfide nanoparticles. A further advantage of this method is the ability to sample the solution over time and hence determine the growth kinetics.