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Consider a 20-L evacuated rigid bottle that is surrounded by the atmosphere at 100 kPa and 27 Celsius. A valve at the neck of the bottle is now opened and the atmospheric air is allowed to flow into the bottle. The air trapped in the bottle eventually reaches thermal equilibrium with the atmosphere as a result of heat transfer through the wall of the bottle. the valve remains open during the process so that the trapped air also reaches mechanical equilibrium with the atmosphere. Determine the net heat transfer through the wall of the bottle during this filling process.
an amplifier circuit has a gain of 85 db. if the magnitude of the input voltage to the amplifier is12 mv what is the
an electric power plant uses solid waste for fuel in the production of electricity. the cost y in dollars per hour to
the density of liquid water at 25 c is 997 kgm3 and the specific gravity of solid water ice at 0 c is 0.98. 100 kg of
An air heater may be fabricated by coiling Nichrome wire and passing air in cross flow over the wire. Consider a heater fabricated from wire of diameter D=1 mm, L= 2m, electrical resistivity rho=10^-6 ohms, thermal conductivity k=25W/mK, and emiss..
a sample of silty clay has a volume of 14.88cm3 a total mass of 28.81 g a dry mass of 24.83 g and a specific gravity of
energy is added to a piston cylinder arrangement, and the piston is withdrawn in such a way that the quantity PV remains constant. the initial pressure and volume are 200kpa and 2m3, respectively. the final pressure is 100kpa, calculate the work d..
assume that a jet touches down 170 mph and its speed is reduced to zero in 240 ft. assuming a constant deceleration
air enters an adiabatic compressor at 20 degc and 100 kpa at a rate of 2 kgs and exits at 700 kpa. if the power input
determine the work done by a 1-lb fluid system as it expands slowly within a piston-cylinder arrangement from an
air enters a constant-diameter tube with an average velocity of 2 ms at a temperature of 400 k and a pressure of 0.12
assuming that steam can be treated as an ideal gas what would the specific volume of steam be at 600deg f and 120 psia
bullet a from west with a mass of 175g and speed of 550ms and bullet b from east with a mass of 150g and speed of 200ms
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