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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
An air standard diesel cycle has a compression ratio of 20 and the heat transferred to the working fluid per cycle is 1800 kJ/kg. At the beginning of the compression process, the pressure is 0.1 MPa
A brake system applies a resistive torque of 25 N. How many revolutions will occur if a 300 kg solid wheel of diameter 0.25 m is slowed from 300 rpm to 0 rpm?
Two Carnot engines operate in series such that the heat rejected from one is the heat input to the other. The heat rejected from the high temperature reservoir is 500 kJ.
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.
Superheated ammonia enters an insulated nozzle at 200C and 800kPa. The flow through the low velocity inlet is at 0.015kg/s. At the discharge, the ammonia exits at 280kPa with a velocity of 400m/s.
A Centrifugal pump can provide a 20-m head rise at 75 rev/min. If the rotation speed increases to 90 rev/min, what will be the head rise? Note the pump runs under dynamically similar conditions.
Consider a house whose walls are 4 m high and 12 m long. Two of the walls of the house have no windows, while each of the other two walls has four wndows made of 0.6-cm-thick glass (k=0.78 W/m*C), 1
Find the entropy production rate for the nozzle. The exit velocity for a reversible and adiabatic nozzle and find the nozzle isentropic efficiency.
IF you can neglect the potential energy effects, the inlet velocity is 100 m/sec and the ratio of the outlet area to the inlet area is 4, WHAT is the power output of the turbine for a mass flow rate
Nitrogen gas at steady-state-steady-flow undergoes a compression provess through a well-insulated compressor. The inlet pressure and temperature are 100 kPa and 300K THe exit pressure is 1500 kOa. T
Argon gas flows through a rigid nozzle at steady-state-steady flow. The inlet flow velocity is small. THe gas exits the nozzle at 450 m/s with mass flowrate of 88 kg/s and exit area of .10 m^2/ Heat
Estimate the net power output of the plant, in Btu/h if the pumps used to circulate seawater through the evaporator and condenser heat exchangers require a total power input of 2.55 X 108 Btu/h.
Describe fully what happens when you cools down a melt of 40mol% Nio-60mol% Mgo. Give the compositions of the phases and their relative amount for at least three temperatures in the two phase field
10 mol/s of liquid benzene at 20°C and 1 bar is pumped to 5 bar. At the inlet conditions, the molar volume of benzene is 11.8 liter/mol. Estimate the outlet temperature of the benzene and the w