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A freezer compartment is covered with a 2-mm-thick layer of frost at the time it malfunctions. If the compartment is in ambient air at 20°C and a coefficient of h = 2 W/m2 · K characterizes heat transfer by natural convection from the exposed surface of the layer, estimate the time required to completely melt the frost. The frost may be assumed to have a mass density of 700 kg/m3 and a latent heat of fusion of 334 kJ/kg.
the position of the l-shaped rod shown is controlled by a cable attached at b. knowing that the rod supports a load of
Consider a three-point moving-average discrete-time filter described by the difference equation y [ n ) = t{x[ n ) +x [ n - 1) +x [ n - 2]}
Find the transverse deflection and slope of node 2 of the beam shown in Fig. 12.24 using a two-element idealization. Compare the solution with that of simple beam theory.
a new building to be located in a cold climate is being designed with a basement that has an l200 mm thick wall. inner
a person weighs 180lbs at sea level. the radius of the earth is 3960 mi. what force is exerted on the person by the
a piston cylinder device initially contains steam at 200 kpa 200 degree c and 0.4 m3. at this state a linear spring is
If this machine works as a heat pump, how much heat will it deliver to the environment?
A voltage signal is produced by a transducer. The signal contains its strongest frequency component at 50 Hz (amplitude = 5.0 V), plus a weaker component at the second harmonic (100 Hz) with amplitude 2.0 V. In addition, there is noise at 60 Hz with..
the fatigue data for a brass alloy are given as followsstress amplitude mpa -----------------cycles to failure310
air at 80 kpa 300 k and 250 ms enters a diffuser at a rate of 2.5 kgs and leaves at 315 k. the exit area of the
starting from rest the motorboat travels around the circular pathp 50m at a speed v0.8tms where t is in seconds.
Write an expression for the signal, Sc, in terms of R, the coating blackbody emissive power, the blackbody emissive power of the surroundings, the coating emissivity, and the appropriate band emission fractions
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