Consider a sample of beams with elliptical cross section. the semi-major axis a and semi-minor axis b are measured and found to have means a¯ and ¯b and standard deviations sa = 0.02¯a and sb = 0.03¯b, respectively. compute the uncertainty in the corresponding beam cross-sectional area a, cross-section perimeter p , and moment of inertia i. that is, compute ua, up , and ui . assume the uncertainty of each term is equal to the standard deviation, i. e., ua = sa and ub = sb. to the extent possible, also report the relative uncertainties ua/a, up /p , and ui/i, simplified as much as possible.

Courses that are developed by subject matter experts, internal or extemal to the college or university. these programs are marketed by the school (clo2) marks a)-vocational schools b)-vendor training c)-colleges & universities d)-continuing education programs

Analyze the factors that influence the choice between the following pairs of processes to make the products indicated: i) sand casting versus die casting of an electric-motor housing ii) thread rolling versus machining of a bolt for high-strength application. (co3/c5)

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.