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A 2-m3 insulated tank containing ammonia at ?20?C, 80% quality, is connected by a valve to line flowing ammonia at 2 MPa
A 2-L liquid is mixed with 3 L of another liquid, forming a homogeneous liquid solution at the same temperature and pressure
A 2-kW pump is used to pump kerosene (r = 0.820 kg/L) from a tank on the ground to a tank at a higher elevation
A 2-m3 rigid insulated tank initially containing saturated water vapor at 1 MPa is connected through a valve to a supply line that carries steam at 400°C.
A 20-m3 tank contains nitrogen at 23°C and 600 kPa. Some nitrogen is allowed to escape until the pressure in the tank drops to 400 kPa
A 20-kg aluminum block initially at 200°C is brought into contact with a 20-kg block of iron at 100°C in an insulated enclosure
A 20-ft3 tank contains ammonia at 20 lbf/in 2, 80 F. The tank is attached to a line flowing ammonia at 180 lbf/in 2, 140 F.
A 2.5 X 3.5 X 6 in. brick whose density is 120 lb/ft3 slips off the top of a building under construction and falls 69ft.
A 25 kg steel tank initially at -10oC is filled up with 100 kg of milk (assume properties as water) at 30oC.
A 25 kg mass moves with 25 m/s. Now a brake system brings the mass to a complete stop with a constant deceleration over a period of 5 seconds.
A 200-pound man has a total foot imprint area of 72 in2. Determine the pressure this man exerts on the ground if
A 200 liter tank initially contains water at 100 kPa and a quality of 1%. Heat is transferred to the water thereby raising its pressure and temperature
A 100-L insulated tank contains N2 gas at 200 kPa and ambient temperature 25°C. The tank is connected by a valve to a supply line flowing CO2 at 1.2 MPa
If the base has an emissivity of 0.6 and a surface area of 0.02 m2, determine the temperature of the base of the iron.
A 15-ft3 steel container that has a mass of 75 lbm when empty is filled with liquid water. Initially, both the steel tank and the water are at 120°F.
A 15-ft3 rigid tank contains a saturated mixture of refrigerant-134a at 50 psia. If the saturated liquid occupies 20 percent of the volume
A 1000-W iron is left on the ironing board with its base exposed to the air at 20°C. If the temperature of the base of the iron is 150°C
A 100-L rigid tank contains carbon dioxide gas at 1 MPa, 300 K. A valve is cracked open, and carbon dioxide escapes slowly until the tank pressure
A 2-kW baseboard electric resistance heater in a vacant room is turned on and kept on for 15 min
A 2-kg piece of iron is heated from room temperature 25°C to 400°C by a heat source at 600°C. What is the irreversibility in the process?
A 2 m tall cylinder has a small hole in the bottom. It is filled with liquid water 1 m high, on top of which is 1 m high air column at atmospheric pressure
A 150-lbm astronaut took his bathroom scale (a spring scale) and a beam scale (compares masses) to the moon where the local gravity is g = 5.48 ft/s2.
A 10-L rigid tank contains R-22-410 at -10°C, 80% quality. A 10-A electric current (from a 6-V battery) is passed through a resistor inside the tank for 10 min
A 1-m3 tank containing air at 25°C and 500 kPa is connected through a valve to another tank containing 5 kg of air at 35°C and 200 kPa.
A 1-m3 rigid tank with air at 1 MPa, 400 K is connected to an air line. The valve is opened and air flows into the tank until the pressure reaches 5 MPa