Para descargar granos de la bodega de un barco se emplea un elevador que levanta el grano a una distancia de 12 m. la descarga del grano se realiza por la parte superior del elevador a razón de 2.0 kg cada segundo y la velocidad de descarga de cada partícula de grano es de 3.0 m/s. encuentre la potencia mínima (en hp) del motor que puede elevar los granos de este modo.

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero