Water contained in a closed, rigid tank, initially at 100 lbf/ in.2, 8008F, is cooled to a final state where the pressure is 20 lbf/in.2 Determine the change in specific entropy, in Btu/lb ? 8R, and show the process on sketches of the T– and T–s diagrams.

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.

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)

The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object