La tienda Wal-Mart Store comprime y carga en una tarima las cajas de cartón vacías para reciclarlas. La tienda genera cinco tarimas al día. El costo de almacenar una tarima en la parte trasera de la tienda es de $.10 por día. La compañía que traslada las tarimas al centro de reciclaje cobra una cuota fija de $100 por la renta de su equipo de carga, más un costo de transporte variable de $3 por paleta. Grafique el cambio en la cantidad de tarimas con el tiempo, e idee una política óptima para el traslado de las tarimas al centro de reciclaje.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody