Acapacitance sensor consists of two overlapping plates separated by a small gap filled with either a dielectric material or a vacuum. capacitance is changed by varying either the area of overlap, a, or changing the thickness of the gap,, such that calar of 600+ 0.3 mm2 and gap thickness of 0.30 0.01 mm, estimate the uncertainty in capacitance. let cs-8.85 x 10-15 f/mm, assume 95% confidence in all values and no an area correlated errors.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?