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Application: Design of sheathing for optical fibers. An optical fiber is made of a glass material with a thin plastic coating as shown in Figure 13.33. Both materials are transparent at the frequencies of interest. Relative permittivity of glass is 2.25 and that of the plastic material may be chosen as (1) 4.0 or (2) 2.0. The optical fiber operates in free space.
(a) Which coating is a better choice and why?
(b) Calculate the critical angle for propagation inside the glass material, based on your answer in (a).
(c) Suppose propagation is also allowed in the coating. What is now the answer to (a) and what is the critical angle for propagation?
A person with a uniform temperature of 29 C is standing barefoot on a block of ice in a breezy room at 20 C with an effective convection coefficient equal to 8 W/m^2 C. The surface area exposed to forced convection is 1.6 m^2.
As you stroll the isles of the local flea market, you come across a booth stocked with surplus permanent magnet brushed DC motors. Your eyes widen with excitement as you notice a particularly shiny gear motor priced at just $1.50. Whipping your trust..
A piston-cylinder contains 0.1 kg of superheated steam at 180?C and 5.0 bars. The piston is frictionless and freely floating. Heat is added until the final volume is twice the initial volume. What is the work done on or by the steam?
A duralumin tie bar of diameter 40 mm and length 600 mm carries a tensile load of 180 kN. If the bar contains a 30 mm diameter hole along 100 mm of its length, determine the stress in the two sections and the overall change in length.
say you have two lumps of copper one hot and the other cold. what is the maximum work you could obtain by running a
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Define the decision variables and write out an optimization problem. Give the complete formulation explicitly stating objective function, all constraints and parameter values. Use Excel program to solve the formulated optimization problem. Show ev..
the position of a point p on a line is given by the equation x t sinpi t2. the point starts moving at t0. find the
A simplified single-cylinder internal combustion engine that produces 20 hp is shown in figure 4-33. It loses 40 kJ/min in radiated and conducted heat while using 0.73 kg/min of fuel-air mixture which is assumed to have an enthalpy of 2600 kJ/kg of m..
A water jet that leaves a nozzle at 60 m/s at a flow rate of 120 kg/s is to be used to generate power by striking the buckets located on the perimeter of a wheel. Determine the power generation potential of this water jet.
Evaluate the concentration of vacancies in copper at 650C temperature. What temperature will be needed to heat treat copper such that the concentration of vacancies produced will be 1000 times more than the equilibrium concentration of vacancies at s..
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