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A flat surface having an area of 2m2 and a temperature of 350K is cooled convectively by a gas at 300K. Using data determine the largest and smallest heat
A fixed mass of an ideal gas is heated from 50 to 80°C at a constant pressure of
A desktop computer is to be cooled by a fan whose flow rate is 0.34 m3/min. Determine the mass flow rate of air through the fan at an elevation of 3400 m
A cylinder, Acyl=7.012 cm2, has two pistons mounted, the upper one, mp1=100 kg, initially resting on the stops.
A cylinder/piston contains 1 kg methane gas at 100 kPa, 20°C. The gas is compressed reversibly to a pressure of 800 kPa
It is cooled to 75 F, at which point the pressure is 45 lbf/in.2. Calculate the heat transfer for the process.
A cylinder with a linear spring-loaded piston contains carbon dioxide gas at 300 lbf/in 2 with a volume of 2 ft3. The device is of aluminum and has a mass of 8
A cylinder/piston contains saturated vapor R-22 at 10°C; the volume is 10 L. The R-22 is compressed to 2 MPa, 60°C in a reversible (internally) polytropic
A cylinder/piston contains carbon dioxide at 1 MPa, 300°C with a volume of 200 L. The total external force acting on the piston is proportional to V 3
A cylinder/piston contains air at ambient conditions, 100 kPa and 20°C with a volume of 0.3 m3. The air is compressed to 800 kPa in a reversible polytropic
A diesel engine has a compression ratio of 20:1 with an inlet of 95 kPa, 290 K, state 1, with volume 0.5 L. The maximum cycle temperature is 1800 K
A desuperheater mixes superheated water vapor with liquid water in a ratio that produces saturated water vapor as output without any external heat transfer
A department store expects to have 120 customers and 15 employees at peak times in summer. Determine the contribution of people to the total cooling load
A damaged 1200-kg car is being towed by a truck. Neglecting the friction, air drag, and rolling resistance determine the extra power required
A dam retains a lake 6 m deep. To construct a gate in the dam we need to know the net horizontal force on a 5 m wide and 6 m tall port section
If the project team determines that the best alternative is to modify a purchased software package, then the team has several options to consider.
A cylinder fitted with a movable piston contains water at 3 MPa, 50% quality, at which point the volume is 20 L.
A cylinder fitted with a frictionless piston contains 4 lbm of superheated refrigerant R-134a vapor at 400 lbf/in 2, 200 F.
A cylinder fitted with a frictionless piston contains 0.2 kg of saturated (both liquid and vapor present) R-12 at -20oC.
A cylinder fitted with a piston contains liquid methanol at 20?C, 100 kPa and volume 10 L. The piston is moved, compressing the methanol to 20 MPa
A cylinder fitted with a piston contains ammonia at 120 F, 20% quality with a volume of 60 in 3. The ammonia expands slowly, and during this process
A cylinder fitted with a piston contains air at 400 K, 1.0 MPa, at which point the volume is 100 L. The air now expands to a final state at 300 K, 200 kPa
A cylinder fitted with a piston contains 0.5 kg of R-134a at 60°C, with a quality of 50 percent. The R-134a now expands in an internally reversible polytropic
A cylinder fitted with a movable piston contains propane, initially at 67oC and 50 % quality, at which point the volume is 2 L.
A cylinder having an initial volume of 3 m3 contains 0.1 kg of water at 40°C. The water is then compressed in an isothermal quasi-equilibrium process