A vertical load of 20000 lb is applied to a 6.0 ft × 4.0 ft area at the ground surface that is level. Use chart solution to compute the induced vertical stress, at a point 6.0 ft below the corner z of this rectangular loaded area.

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

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