A5m x 5 m × 4 m dormitory room is at 100 kpa and 20°c. a 150w fan is turned on for 4 hours inside the room. assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows. the gas constant of air is r 0.287 kj/kg-k, specific capacity c 0.718 kj/kg. k for air at room temperature. determine whether the room has been cooled down and calculate the final room temperature.

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

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.

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.