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the steel rails of a railroad track are laid in the winter at a temperature of 15 f with gaps of 0.01 ft between the
Consider a one-dimensional plane wall at a uniform initial temperature Ti. The wall is 10 mm thick, and has a thermal diffusivity of 6 x 10^-7 m2/s. The left face is insulated, and suddenly the right face is lowered to a temperature Ts,r.
Determine the view factors F12 and F21 for two concentric spheres characterized by radii R1 and R2, where R2 > R1. What is the view factor when the smaller sphere is displaced from the origin by R1/2 and R2 > 4R1?
A dragster comes off the start line with an acceleration of 4 m/s2. The acceleration increases uniformly from 4 m/s2 to 10m/s2 over 3 seconds, then remains constant to the finish line (500m). Find: a) the acceleration as a function of time (make a gr..
air is drawn into a small open-circuit wing tunnel as shown. atmospheric pressure is 98.7 kpa abs and the temperature
compressed liquid water at 42 c and 8 mpa steadily flows into a boiler and exits as a saturated vapor at 8 mpa. the
a pump draws water from a reservoir through a 150 mm diameter suction pipe and delivers it to a 75 mm diameter
An 8" thick copper bulkhead (kept at 100 C by electrical heat) at the entrance of a flow reactor. The bulkhead is penetrated by a multitude of 0.25" diameter by 8" long cylindrical openings. The heated copper bulkhead is attached to 17" of excellent ..
0.5 kg of water initially at 400 kPa and 0.3 m3/kg is contained within a piston-cylinder device fitted with retractable stops (initially retracted) so that the water supports the weight of the piston and the force of the atmosphere (state 1). The wat..
consider a metal that is subjected to cold working by rolling it to a lesser thickness or hammering it. a would you
A large plastic casting with thermal diffusivity 6.0 x10^7 m2 /s is removed from its mold at a uniform temperature of 150 degrees C. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temper..
an insulated mixing chamber receives 4 lbms r-134a at 150 lbfin.2 220 f in a line with low velocity. another line with
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