Consider a micro mirror which is tethered by two torsional springs. Mirror and tethers are made of aluminum. Two tethers are fixed at the end. The length of tether (L) is 5 µm, thickness (t) is 0.3 µm, and width (w) is 1 µm. Assume that aluminum’s Young’s modulus is 70 GPa and Poisson’s ratio is 0.33. The micro mirror tilts into/out of the page with angle of ± 12°. What is the required torque to make the mirror tilted ± 12°?

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.