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A particular thermal system involves three objects of fixed shape with conduction resistances of R1 = 1 K/W, R2 = 2 K/W and R3 = 4 K/W, respectively. An objec- tive is to minimize the total thermal resistance Rtot asso- ciated with a combination of R1, R2, and R3. The chief engineer is willing to invest limited funds to specify an alternative material for just one of the three objects; the alternative material will have a thermal conductiv- ity that is twice its nominal value. Which object (1, 2, or 3) should be fabricated of the higher thermal con- ductivity material to most significantly decrease Rtot? Hint: Consider two cases, one for which the three ther- mal resistances are arranged in series, and the second for which the three resistances are arranged in parallel.
Determine the periodic time of the motion, the maximum velocity and acceleration and (c) the velocity and acceleration when the body is 300 mm from its amplitude.
the department of energy projects that between the years 1995 and 2010 the united states will need to build new power
the data below refers to a steady flow of newtonian fluid through a long horizontal tube. determine a is the flow
a 3 cubic meter tank contains propane at 0.5 mpa and 3degc. gas leaks out of the tank. at the time of detection of leak
Let A, B, C and D denote four reference frames, composed of mutuality orthogonal unit vectors ai, bi, ci and di (i=1,2,3), respectively. Assume that rotation matrices aRc, aRd and bRd are given. Let x, y, z and t denote some specified constants. Give..
refrigerant 134a enters an insulated throttling valve at 140 lbfin2 and 80degf. the refrigerant exits the valve at 50
matt has perfected the art of bungee jumping such that from a bridge above a river he can fall and just touch the
a refrigerator is situated in an insulated room it has a 2-hp motor that drives a compressor. over a 30 minute period
Deduce a set of boundary-layer differential equations (continuity, momentum, energy) for steady flow of a constant-property fluid without body forces, and with negligible viscous dissipation, in a coordinate system suitable for analysis of the bounda..
the wheel roles without slipping such that at the instant shown it has an angular velocity and angular acceleration.
Create a CNC program for the attached drawing use a 8.0 mm diameter tool - Use the cutter compensation and method of your choice - Create a listing of your program
using matlab simulink set up the negative feedback system of nbspand find the value of the gainnbspaplot the step
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