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A piston/cylinder contains helium at 110 kPa at ambient temperature 20oC, and initial volume of 20 L. The stops are mounted to give a maximum volume of 25 L and the nitrogen line conditions are 300 kPa, 30oC. The valve is now opened which allows nitrogen to flow in and mix with the helium. The valve is closed when the pressure inside reaches 200 kPa, at which point the temperature inside is 40oC. Is this process consistent with the second law of thermodynamics?
Air at 90 kpa and -7 C enters an adiabatic diffuser steadily with a velocity of 180 m/s and leaves with a low velocity at a pressure of 100 kpa. The exit area of the diffuser is 5 times the inlet area. Determine (a) the exit temperature and (b) th..
A large manufacturing space with an average floor to ceiling height of 30 ft has a floor area of 5000 ft^2. The total infiltration rate for the space is estimated to be 1.5 air changes per hour. The inside design temperature and relative humidity are..
A speaker driver can be modeled as a one degree of freedom forced system with damping. The mass of the moving cone is m=0.1 kg and the spring k=50000N/m.
an inward radial flow turbine is to develop 400 hp when supplied with air at 800c and 3 bar abs the exhaust total
a reversible power cycle operates between a reservoir at temperature th and a lower temperature reservoir at 290 k. at
an ocean thermal energy conversion otec system is proposed to generate 10 mw of electricity. the proposed location of
Compute the sum of the combination of factored loads U based on ACI code section. A cantilever beam shown in the figure below supports a uniform service (unfactored) dead load of 1 kip/ft plus its own dead load and a concentrated service
determine whether the force and couple system shown can be reduced to a single equivalent force r. if it can determine
a system of propane and n-butane exists in two phase vapor liquid equilibrium at 10 bar and 323 k. the mole fraction
argon gas initially at 1 bar 100 k undergoes a polytropic process with n k to a final pressure of 15.59 bar. the work
A US Department of Energy article states that a leak of one drip of hot water per second can cost $1.00 per month. Making reasonable assumptions about drop size and unit cost of energy, determine if this claim is reasonable.
The angular acceleration of a shaft is defined by the relation a = -0.25w, where a is expressed in rad/s^2 and w in rad/s. Knowing that at t=0 th angular velocity of the shaft is 20 rad/s, determine the time required for the shaft to come to rest.
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