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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.
at room temperature 25 c what pressure in both kpa and psi is required to liquefy propane c3h8? b determine values of
steam enters a nozzle at 30 bars and 320c and leaves at 15 bars with a velocity of 535 ms. the mass flow rate is 8000
Obtain your best estimate of the distance in meters covered by the body from t = 5 sec to t = 13 sec using either the Simpson's 1/3rd rule or the trapezoidal rule. Choose as many segments as you please
driving a 2000-ft loaded horizontal conveyor at 4 fts requires 35hp. what horsepower would be required if the conveyor
calculate the escape speed from the earth for a 4800 kg spacecraft and determine the kinetic energy it must have at the
A power plant with one closed FWH has a con- denser temperature of 450C, a maximum pressure of 5 MPa, and a boiler exit temperature of 900C. Extraction steam at 1 MPa to the FWH condenses and is pumped up to the 5-MPa feed water line, where all the w..
Two lead lumps attract each other gravitationally with force F. Now you double the mass of one lump, halve the mass of the other lump, and double the separation between them. What is the magnitude of the new gravitational force between them?
a 9-m-long steel e 200 gpa pipe column has an outside diameter of 220 mm and a wall thickness of 8 mm. the column is
water vapor exists at a pressure of 10kpa and temperature of 373k. assume a reference atmosphere exists at to 298k and
airplane takeoff from an aircraft carrier is assisted by a steam-driven pistoncylinder with an average pressure of 1250
certain system is able to exert an external force f according to the relationship.v velocityf 15000-500vn for v lt
A flat plate is sliding at a constant velocity on a large horizontal table. A thin layer of oil (of absolute viscosity = 0.48 N-s/m2) separates the plate from the table by a thickness of 0.15 cm. For shear stress in the oil layer of 0.1 psi, what is ..
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