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One pound of nitrogen as an ideal gas expands isothermally at 70°F from a volume of 1 ft3 to a volume of 2 ft3. During this process there is heat transfer to the gas from a single reservoir (the surrounding atmosphere) and the gas does work. Evaluate the work and heat transfer for the process, in Btu. Is this process a violation of the Kelvin-Planck statement of the second law of thermodynamics? Explain why or why not.
a solid shaft l 1.9 m long is supported between two bearings. the shaft rotates at 250 rpm. a 20 degree involute gear
liquid chromatography lc flow can be model as a packed bed and is described by the ergun equation. lc systems are often
A block of metal has a 90 notch cut from its lower surface. The notched part rests on a circular cylinder of diameter 2.0 cm, as shown in Fig. 4.15. If the lower surface of the par is 1.3 cm above the base plane, how deep is the notch?
a thermopane window consists of two 6-mm thick glasses separated by a stagnant air space of thickness 6 mm. the thermal
What is the premise of the Heuter-Volkmann Law? 7. What did Pauwels propose for stresses associated with tendon development, bone regeneration, and endochondral ossification? What aspects of his beliefs are contrary to the authors?
The spool has a mass of 75 kg and a radius of gyration . It rests on the inclined surface for which the coefficient of kinetic friction is . If the spool is released from rest and slips at A, determine the initial tension in the cord and the angul..
suppose that 100 lmin are drawn from a fermentation tank and passed through an extraction tank in which the
car a is traveling at va130kmh as it passes a police officer in car p but over the next 5 seconds the car uniformly
ater is the working fluid in a regenerative rankine cycle. the pressure andnbsptemperature at the turbine inlet are
the rigid gate oab of fig. p2.58 is hinged at o andnbsprests against a rigid support at b. what minimum
a 0.5m3 rigid tank contains refirgerant r-134a initially at 200 kpa and 40 quality. heat is now transferred untill the
compute the estimated endurance strength for a 20.0mm-diameter rod machined from aisi 5160 oqt 1300 steel and subjected
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