A commercial building is served by a 400 ampere, 120/208 volt three phase wye electrical system, and the service entrance conductors are 500 Kcmil copper with type THW insulation. The 5/8 inch steel reinforcing bars in the foundation are welded together and used as the grounding electrode for the service. The minimum size copper grounding electrode conductor permitted is AWG numbe

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

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.