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A long copper wire, 0.8 cm in diameter, is suddenly exposed to an air stream at a temperature of T? = 37°C. The thermal conductivity of the wire is k = 400 W/(m*K), the density is ? = 8900 kg/m3, and the heat capacity is cp= 385 J/(kg*K). If the convection coefficient is 50 W/(m2*K), long does it take for the wire to heat from 280K to 297K?
consider a gas-turbine cycle with two stages of compression and two stages of expansion. the pressure ratio across each
a torsional helical spring is used to hold a door closed. the handle on the door is located 30 inches from the center
a building wall is made of 200 mm of poured concrete on the outside 100 mm of fiberglass insulation in the middle and
The velocity of water in a 2-cm-dia pipe is 20 m/s. If the pipe enlarges to 5-cm-dia, the velocity, in m/s, will be: (show work)
calculate the work done and the final temperature for the following processespolytropic n 1.0 1.0 kg of air t1 1470
deformation measurements were made on a flat rock surface using 0.5000 m-long gauge lengths. the following observations
a fluid flows in a certain length of cast iron pipe of 30 cm diameter with a mean velocity of 2.5 ms and head loss of
in a gas turbine natural gas methane and stoichiometric air flow into the combustion chamber at 1000kpa 500k. secondary
1.a turbine receives 0.1 kgs of hot air at 55 ms velocity at 1.4mpa and 900k. the air leaves at 225ms and 200 kpa and
Find the velocity of the bullet and block just after impact.
Consider a model of a bone with a cemented prosthesis, where the outside radius of the bone is ro, the radius of the medullary cavity is rm, and the radius of the prosthesis is rp.
a rigid well insulated container with a volume of 2 ft3 holds 0.12 lb of ammonia initially at a pressure of 20 lbfin2.
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