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The iron block eventually reaches thermal equilibrium with the lake water. Assuming an average specific heat of 0.45 kJ/(kg-K) for the iron, determine the entropy change of the iron block?
Show the cycle on a T-S (temp. vs specific entropy) diagram relative to the 2-phase region and indicate, with arrows, the directions of working fluid flow.
Determine the rate of heat addition and rejection for this Otto cycle when it produces 179 hp and the cycle is repeated 1040 times per minute.
Steam enters an adiabatic turbine steadily at 3 MPa and 400 deg C and leaves at 70 kPa and 100 deg C. if the power output of the turbine is 2 MW (mega watt), determine the isentropic efficiency of
Aluminum Oxide (Al2O3) has a surface energy of 1 J/m2, estimate the maximum amount of energy (J/g) that is available for densification for spherical particles with a diameter of 1 micron.
What is the difference between Ideal Materials and Real Materials? Is there a difference in strength and why do we see this difference?
What is the horsepower delivered to the plant? do not neglect friction. If all the friction is converted to heat, what will the rise of temperature in the water?
How would you know if the alloy heat treatment is successful? Consider the tensile or yield stress, the elongation, and the microstructure that might be developed.
How many phases can be in equilibrium for various degrees of freedom (temperature, pressure and/or phase composition)?
Sketch the TTT diagram for a typical high hardenability FeFe3C alloy with addition elements such as Ni, Mn, N, etc. in comparison to a binary FeFe3C alloy.
Give the state, temperature, pressure, quality (if applicable), enthalpy, and entropy for each of the four states. calculate the output power from the turbine, and overall thermal efficiancy.
Consider the posts in their initial unyielded state. If P = 50kN, for what temperature change T would the gap between the brass post and rigid beam equal 10mm?
If the loop is placed in an 0.27 T magnetic field that passes through it perpendicular to the area (that is, parallel to the "normal vector" of the surface), what amount of emf will be induced in th
The cable supporting the elevator has a design load of 2500 lb. Using the Impulse-Momentum Equation, determine the time it will take the elevator to stop.
The fuel capacity is 35 MJ/Liter and it costs 0.15 dollar per liter. The boiler efficiency is 95% and the generator efficiency is 99%. What is the mass flow rate in the turbine?
If the surface of the tower is normally kept at 23 Celcius at night and has a emissivity of 0.64, what is the amount of heat loss due to radiation?
What is the heat transfer rate through conduction in Watts. The walls are 9 ft hight and the room has the dimension of 16 ft by 19 feet and the walls and ceiling all have a thermal conductivity of k
Determine the required operating pressures of the boiler and condenser (in kPa). Determine the quality of the R-22 at the entrance and exit of the condenser.
After developing the velocity profile of this Poiseuille flow across the 2m long tube, what is the estimated velocity in m/s at a radius of 1.2 mm in the tube?
What is the appropriate model tow velocity in m/s? A boat of length 50 m is designed to cruise at 30 mph and is to be tested in a tow tank with a model of length 0.5 m.
Determine (i) the inlet air velocity in m/s and (ii) volumetric flow rate in L/min. Show correct units. State all assumptions. Use the problem solving methodology.
If the fluid is gasoline at 20 degrees Celsius and the flow enters the blades radially, estimate the theoretical (a) flow rate in gal/min, (b) horsepower, and (c) head in ft.
Knowing the mass center of the automobile and driver is 2 ft from the wall. Determine the minimum required value of the coefficient of static friction between the tires and the wall.
Draw a system diagram and label all the components. Number the flow, starting with a 1 at the pump inlet. The actual thermal efficiency of the cycle. Compare to the answer you got in problem I and II.