Porque se filtra el agua en los muros de concreto de las casa?

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

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

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?