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Heat loss from an insulated pipe, a standard schedule 40, 2-in. steel pipe (inside diameter 2.067 in. and wall thickness 0.154 in.) carrying steam is insulated with 2 in. of 85% magnesia covered in turn with 2 in. of cork. Estimate the heat loss per hour per foot of pipe if the inner surface of the pipe is at 250F and the outer surface of the cork is at 90°F. The thermal conductivities (in Btu/hr. ft. F) of the substances concerned are: steel, 26.1; 85% magnesia, 0.04; cork, 0.03.
Explain why an electric refrigerator, which transfers energy by means of heat from the cold food storage compartment to the warmer air in the room, is not an impossible "clauses device."
ball a is released from rest at a height of 40ft at the same time that a second ball b is thrown upward 5ft from the
tank a initially contains 100 gallons of pollutant and no water. pure water flows from a source to tank a at a rate of
Friction between the piston and cylinder wall can be neglected because the process occurs so slowly. For the air, determine the initial and final pressures in kPa and the boundary work for the process in kJ.
Consider a one-foot long 1/16" diameter steel wire pulled to a load of 350 pounds, while stretching only 0.045" . What is the calculated modulus in msi (use three significant digits)?
The diffusivity of copper in a commercial brass alloy is 10^-20 m2/s at 400 degrees C. The activation energy for diffusion of copper in this system is 195 kJ/mol. Calculate the diffusivity at 600 degrees C.
Refrigerant R-134a is compressed steadily and adiabatically in a reversible compressor. The volume flow rate entering the compressor is 800 ft3/min.
in a standard tensile test a steel rod of 22-mm diameter is subjected to a tension force of 75 kn. knowing that
a balloon in the upper atmosphere is filled with water vapor with a speci?c volume of 10 m3 kg. a if its volume is 25
spherical tanks a and b shown here are connected by a pipe and valve. tank a has a diameter of 2.29 m and tank b a
a current of 4 a is maintained in a single circular loop having a circumference of 80 cm. an external magnetic fiel of
an electrical heater 100mm long and 5mm in diameter is inserted into a hole drilled normal to the surface of a large
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