3. Sitúese en la época de los faraones en Egipto. Usted es el encargado de construir una de esas fabulosas pirámides que fueron levantadas hace más de 5 000 años. Algunas de las piedras con que están construidas pesan más de 200 T y han sido colocadas a alturas que sobrepasan los 30 metros. Considere el problema de mover esas moles e indique, como futuro ingeniero, cómo resolvería el problema de desplazarlas, levantarlas y ponerlas en su lugar. Haga un estudio de esa época y se dará cuenta de las rudimentarias herramientas con que contaban.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

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.

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa