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A heat pump with a COP of 3.0 is used to heat air contained in a 1205.4m^3 of well-insulated, rigid tank. Initially the pressure and the temperature inside the gas tank are 100 kPa and 7 degrees Cel
A system executes a power cycle while receiving 1050 kJ by heat transfer at a temperature of 525 K and discharging 700 kJ by heat transfer at 350 K. There are no other heat transfers.
Determine the temperature (or quality if a saturated mixture) of the water as it leaves the chamber at a pressure of 1.4MPa and the entropy generation per unit mass of steam exiting the chamber.
2 kg of saturated water vapor at 600 kPa are contained in a piston-cylinder device. The water expands adiabatically until the pressure reaches 100 kPa. Find the entropy change of the water.
A cannon is pointed at 60 degrees angle relative to flat horizontal field. it fires a projectile with a muzzle speed of 1500 ft/s Then the gunner changer the angle to 30 reload the cannon and 5.0 se
Due to the elasticity of the balloon, the pressure remains proportional to the diameter squared at all times. Determine the work (kJ) and heat transfer (kJ) associated with this process.
Assuming the mass of the whip is uniformly distributed along its length, calculate the velocity of the end of the whip as a function of the position of the loop (x), and calculate the position of th
During this process heat is transferred to the system to maintain the air within the system at 30*C. Determine this heat transfer (kJ).
A 4mx5mx6m room is to be heated by a baseboard resistance heater. It is desired that the resistance heater be able to raise the air temperature in the room from 7 to 23oC within 15 min.
Determine the exit velocity of the stream (ft/s) and the mass flow rate (lbm/s) of the steam at the nozzle entrance if the nozzle exit area is 0.01ft^2.
Calculate the quality of the vapor-liquid mixture in the tank when half of the total mass has been removed from the tank. Determine the amount of heat transfer required when half of th
What weight of iron must be tied to one end of the log to keep it floating in an upright position in seawater with 18 ft of the log submerged.
Steam at 1 MPa with a quality of 0.8 passes through a throttling device that causes the pressure to rapidly drop to 200 kPa. If the mass flow rate is 0.4 kg/s, what is the rate of entropy generatio
You have been hired to develop a package transfer slide for a global company. The slide has length L. The slide is to be able to handle uniform boxes of mass m, height H.
Copper has a melting point of 1085 oC. Consider molten copper is cooled from 1200oC. Is homogeneous nucleation possible at 1085oC? Give reasons.
Sketch the Ewald sphere construction for the 200 diffraction with Mo Kalpha radiation and a poly crystalline specimen of a simple cubic structure with a=3.3A.
Plot the reciprocal lattice for a polycrystalline sample of a material with a simple tetragonal structure and lattice parameters a=3.0A and c=5.0A.
Determine the cooling capacity of the device and the actual COP of the combined-cycle package = useful effect/expensive input.
A compressor receives air at 95kPa and 250C at low velocity. At the exit of the compressor, air discharges at 1.52MPa and 4300C with a velocity of 80m/s. The electrical power of the consumption of
For each claimed set of data listed below, determine whether the cycle operates reversibly, operates irreversibly, or is impossible.
You have three blocks of different materials at various temperatures. they are 2-kg block of iron at 600 K, a 3-kg block of copper at 800 K, and a 10-kg block of granite at 300 .
Determine the tension in the cable when the balloon is inflated as a sphere having a diameter of 60 ft. Assume that the hot air has a specific weight of 0.040 lb/ft3 and ambient air has a specific w
Heating up water for your morning shower provides an excellent example of heat exchange (and mixing that you control). Consider the cold water (Cp = 4.18kJ/kg°C) leading to your shower enters a
An impeller provides 20 kJ of work to the air contained in a 0.15 m3 rigid volume, initially at 200kPa and 10°C. Determine the entropy change if the volume is insulated.
Calculate the steady rate of entropy production, s& (kJ/K/s), by the power unit & by the refrigeration unit. Entropy production is not a good thing. Find the amount of unnecessary or lost po