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The barometric pressure is reported to be 605.5 torr and the temperature of the water is 22.5 c. How is the mass of the gas filling the Erlenmeyer determined?
Consider a small ammonia absorption refrigeration cycle that is powered by solar energy and is to be used as an air conditioner. Saturated vapor ammonia leaves the generator at 50°C, and saturat
The performance of an ammonia absorption cycle refrigerator is to be compared with that of a similar vapor-compression system. Consider an absorption system having an evaporator temperature of ?10&d
Knowing that v = -4 m/s at t=0, and v=20 m/s at t = 4, determine the constant K. Determine the equations of velocity and position, knowing that x = 4m when t = 6s.
Calculate the percentage volume change for a material being transformed from FCC to BCC. remember to assume the atomic diameters to be fixed and the atoms are packed together as rigid spheres.
Assuming an axial velocity at the eye of the impeller, an impeller tip diameter of 33cm, a slip factor of 0.90 and a power input factor of 1.04, calculate the rotational speed required fo the centri
If cold water at 20 degrees C enters the hot water tank at the same rate as hot water exits, how much electrical work is done to the water in the tank?
What is NACA, when did it exist, and what are some of its major accomplishments? What is NASA, when was it founded, and what are some of its accomplishments?
If ice homogeneously nucleates at -40 degrees C, calculate the critical radius values of 3.1 x 10^8 J/m3, respectively, for the latent heat of fusion and the ice/water interferface free energy.
What is the definition of the streamline and what are its uses? What is a perfect gas and what is the perfect gas equation of state?
Determine the nature of the first phase change that eventually occurs in the system as a result of this process, and b. determine the pressure st which this phase change occurs.
What is the skin friction coefficient and how does it vary over a flat plate (laminar and turbulent)? What is the effect of compressibility on skin friction?
The air temperature is maintained constant at 25 oC during this process as a result of heat transfer to the surroundings at 17 oC. Determine the entropy chang
What is separation and what causes it? What are the differences between laminar and turbulent flow and their respective boundary layers?
If the duct surface temperature is maintained constant at 400 K, calculate the heat transfer to the air and the exit air temperature.
What does the area-velocity relationship tell us about flow in a supersonic wind tunnel? What is the throat, and what is its critical property?
A refrigerator in a kitchen at 20 degrees celcius uses R-134a. The freezer is to be kept at -5 degrees celcius or cooler. What is the maximum pressure that can be used in the evaporator? Why?
Assume that the ammonia is an ideal gas. Find the outlet temperature of the gas and the work consumed by the compressor. For this problem, take the Cp=4.269R, where R is the gas law constant.
What is the difference between the true airspeed and the equivalent airspeed? What are the differences between subsonic and supersonic wind tunnels?
Steam enters a two-stage adiabatic turbine at 8 MPa and 550ºC (State 1) and is expanded to 2 MPa. Calculate the mass flow rate (kg/s) through the two-stage turbine.
What are the key differences between incompressible subsonic flow, compressible subsonic flow, transonic flow, and supersonic flow, and what are the approximate boundaries of these regimes?
An electric heater in the form of a horizontal disk of 57 mm diameter is used to heat the bottom of a tank filled with engine oil at a temperature of 5 degrees celcius.
What are the two types of specific heat and how do they relate to energy and enthalpy? How do the ratio of specific heats, the gas constants, and specific heats relate to one another?
The mass flowrate of the condenser cooling water, in kg/hr if the cooling water enters the condenser at 15C and exits at 35C with negligible pressure change.
What is the difference between steady and unsteady flow? What is Bernoulli's equation and what assumptions are required for it to be valid?