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(a) List several advantages and disadvantages of using transparent polymeric mate- rials for eyeglass lenses.
(b) Cite four properties (in addition to be- ing transparent) that are important for this application.
(c) Note three polymers that may be can- didates for eyeglass lenses, and then tabu- late values of the properties noted in part (b) for these three materials.
water with a density of 62.4 lbmft3 enters a 36 diameter cylindrical container at 85 gpm. water is allowed to exit the
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refrigerant-134a at 800 kpa and 25 degree c is throttled to a temperature of -20 degree c. determine the pressure and
resolve a vector a which has a magnitude of 50 units and a direction of 210 degrees into two vetors b and c. c is to be
a 1030 steel is given an improper quench and temper heat treatment producing a final structure composed of 60
An automobile weighing 2500 lbf increases its gravitational potential energy by 2.25x10^4 Btu in going from an elevation of 5183 ft in Denver to the highest elevation on Trail Ridge Road in the Rocky Mountains. What is the elevation at the high point..
a 250 mm diameter x 25 mm width grinding wheel operates at 2600 revmin in-feed is 0.05 mmpass cross-feed is 3.50 mm.
vector r is the difference between vectors t and s. if s is inclined 28 degrees from the vertical and the angle between
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